STC8C2K64S4-36I-LQFP44

STC Micro · Microcontroller Units (MCUs/MPUs/SOCs) · LQFP-44(10x10)

STC8C2K64S4-36I-LQFP44 from STC Micro, in a LQFP-44(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	P1.0	bidirectional	Standard I/O port P1.0, also RxD2 (UART2 receive pin); input-only function when used as UART receive, port is high-impedance input after power-on.
2	P1.1	bidirectional	Standard I/O port P1.1, also TxD2 (UART2 transmit output).
3	P1.2	bidirectional	Standard I/O port P1.2, also SS (SPI slave select), T2 (Timer 2 external clock input).
4	P1.3	bidirectional	Standard I/O port P1.3, also MOSI (SPI master out/slave in) and T2CLKO (Timer 2 clock output).
5	P1.4	bidirectional	Standard I/O port P1.4, also MISO (SPI master in/slave out) and I2C data line SDA.
6	P4.4	bidirectional	Standard I/O port P4.4, also RD (external bus read strobe) and TxD_4 (UART1 transmit alternate).
7	P1.5	bidirectional	Standard I/O port P1.5, also SPI clock SCLK and I2C clock SCL.
8	P1.6	bidirectional	Standard I/O port P1.6, also RxD_3 (UART1 receive alternate), XTALO (external crystal output) and MCLKO_2 (main clock output); high-impedance input when used as external clock input pin.
9	P1.7	bidirectional	Standard I/O port P1.7, also TxD_3 (UART1 transmit alternate) and XTALI (external crystal/clock input).
10	P4.5	bidirectional	Standard I/O port P4.5 with full I/O function, configurable in four modes.
11	P4.6	bidirectional	Standard I/O port P4.6 with full I/O function, configurable in four modes.
12	P4.7	bidirectional	Standard I/O port P4.7 with full I/O function, configurable in four modes.
13	P5.4	bidirectional	Standard I/O port P5.4, also RST (active-low reset input when configured as reset pin) and MCLKO (main clock output); powers up with internal 4K pull-up active for about 6.5 ms.
14	Vcc	power_in	Power supply pin; operating voltage 1.9V to 5.5V.
15	P5.5	bidirectional	Standard I/O port P5.5.
16	Gnd	power_in	Ground pin.
17	P4.0	bidirectional	Standard I/O port P4.0, also WR_3 (external bus write strobe alternate) and RxD2_2 (UART2 receive alternate).
18	P3.0	bidirectional	Standard I/O port P3.0, also RxD (UART1 receive) and INT4 (external interrupt 4); weak pull-up after power-on and used with P3.1 for USB download mode detection.
19	P3.1	bidirectional	Standard I/O port P3.1, also TxD (UART1 transmit); weak pull-up after power-on, must not be held low together with P3.0 and P3.2 at power-up unless USB ISP is intended.
20	P3.2	bidirectional	Standard I/O port P3.2, also INT0 (external interrupt 0), SCLK_4 and I2C clock SCL_4; high-impedance input after power-on.
21	P3.3	bidirectional	Standard I/O port P3.3, also INT1 (external interrupt 1), MISO_4 and I2C data SDA_4.
22	P3.4	bidirectional	Standard I/O port P3.4, also T0 (Timer 0 external clock input), T1CLKO, MOSI_4 and CMPO (comparator output).
23	P3.5	bidirectional	Standard I/O port P3.5, also T1 (Timer 1 external clock input), T0CLKO and SS_4 (SPI slave select).
24	P3.6	bidirectional	Standard I/O port P3.6, also INT2 (external interrupt 2), WR_2 (external bus write), RxD_2 and CMP- (comparator negative input).
25	P4.1	bidirectional	Standard I/O port P4.1, also ALE (address latch enable) and CMPO_2 (comparator output alternate).
26	P2.0	bidirectional	Standard I/O port P2.0, also A8 (external bus address bit 8).
27	P4.2	bidirectional	Standard I/O port P4.2, also RD_3 (external bus read alternate) and TxD2_2 (UART2 transmit alternate).
28	P2.1	bidirectional	Standard I/O port P2.1, also A9 (external bus address bit 9).
29	P2.2	bidirectional	Standard I/O port P2.2, also A10 (external bus address bit 10) and SS_2 (SPI slave select alternate).
30	P2.3	bidirectional	Standard I/O port P2.3, also A11 (external bus address bit 11) and MOSI_2 (SPI alternate).
31	P2.4	bidirectional	Standard I/O port P2.4, also A12 (external bus address bit 12), MISO_2 and I2C data SDA_2.
32	P2.5	bidirectional	Standard I/O port P2.5, also A13 (external bus address bit 13), SCLK_2 and I2C clock SCL_2.
33	P2.6	bidirectional	Standard I/O port P2.6, also A14 (external bus address bit 14).
34	P2.7	bidirectional	Standard I/O port P2.7, also A15 (external bus address bit 15).
35	P0.0	bidirectional	Standard I/O port P0.0, also AD0 (multiplexed address/data bus bit 0) and RxD3 (UART3 receive).
36	P0.1	bidirectional	Standard I/O port P0.1, also AD1 (multiplexed address/data bus bit 1) and TxD3 (UART3 transmit).
37	P0.2	bidirectional	Standard I/O port P0.2, also AD2 (multiplexed address/data bus bit 2) and RxD4 (UART4 receive).
38	P4.3	bidirectional	Standard I/O port P4.3, also WR (external bus write strobe) and RxD_4 (UART1 receive alternate).
39	P0.3	bidirectional	Standard I/O port P0.3, also AD3 (multiplexed address/data bus bit 3) and TxD4 (UART4 transmit).
40	P0.4	bidirectional	Standard I/O port P0.4, also AD4 (multiplexed address/data bus bit 4) and T3 (Timer 3 external clock input).
41	P0.5	bidirectional	Standard I/O port P0.5, also AD5 (multiplexed address/data bus bit 5) and T3CLKO (Timer 3 clock output).
42	P0.6	bidirectional	Standard I/O port P0.6, also AD6 (multiplexed address/data bus bit 6) and T4 (Timer 4 external clock input).
43	P0.7	bidirectional	Standard I/O port P0.7, also AD7 (multiplexed address/data bus bit 7) and T4CLKO (Timer 4 clock output).
44	P1.0	bidirectional	Standard I/O port P1.0, also RxD2 (UART2 receive pin).

Key specifications

Parameter	Value
Manufacturer	STC Micro
Package	LQFP-44(10x10)
Category	Embedded Processors & Controllers
Pins	44

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Storage temperature		-55		150	℃		786
Operating temperature		-40		85	℃		786
Operating voltage		1.9		5.5	V		786
VDD to ground voltage	VDD	-0.3		5.5	V		786
I/O port to ground voltage		-0.3			V	max VDD+0.3	786
Logic 1 to 0 transition current	ITL	100	270	600	uA	端口电压 2.0V	787
I/O pull-up resistor	RPU	5.8	5.9	6	KΩ		787
Input low voltage (Schmitt trigger on)	VIL1			0.99	V	打开施密特触发	787
Input low voltage (Schmitt trigger off)	VIL1			1.07	V	关闭施密特触发	787
Input high voltage, normal I/O (Schmitt trigger on)	VIH1	1.18			V	打开施密特触发	787
Input high voltage, normal I/O (Schmitt trigger off)	VIH1	1.09			V	关闭施密特触发	787
Input high voltage, reset pin	VIH2	1.18		0.99	V		787
Logic 0 input current	IIL			50	uA	端口电压 0V	787

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part	Material	Colour / plating	Datasheet says	Page
housing	PC		Accumulator contents and the contents of a sixteen-bit base register, which may be either the Data Pointer or the PC. In the latter case, the PC is incremented to the address of the following	419

CAD (KiCad official)

Symbol: STC8C2K64S4-36I-LQFP44
Footprint: Package_QFP:LQFP-44_10x10mm_P0.8mm
3D model: LQFP-44(10x10) (KiCad packages3D, STEP)
3D model files: stc8c2k64s4-36i-lqfp44-etched.step / stc8c2k64s4-36i-lqfp44-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stc8c2k64s4-36i-lqfp44.step / stc8c2k64s4-36i-lqfp44.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: STC Micro datasheet (956 pp, sha256 f8fa5bab02998432, retrieved 2026-10-27, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus off (skipped (clean text read)), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

# STC8C2K64S4-36I-LQFP44

**STC Micro** · Microcontroller Units (MCUs/MPUs/SOCs) · LQFP-44(10x10)

STC8C2K64S4-36I-LQFP44 from STC Micro, in a LQFP-44(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | P1.0 | bidirectional | Standard I/O port P1.0, also RxD2 (UART2 receive pin); input-only function when used as UART receive, port is high-impedance input after power-on. |
| 2 | P1.1 | bidirectional | Standard I/O port P1.1, also TxD2 (UART2 transmit output). |
| 3 | P1.2 | bidirectional | Standard I/O port P1.2, also SS (SPI slave select), T2 (Timer 2 external clock input). |
| 4 | P1.3 | bidirectional | Standard I/O port P1.3, also MOSI (SPI master out/slave in) and T2CLKO (Timer 2 clock output). |
| 5 | P1.4 | bidirectional | Standard I/O port P1.4, also MISO (SPI master in/slave out) and I2C data line SDA. |
| 6 | P4.4 | bidirectional | Standard I/O port P4.4, also RD (external bus read strobe) and TxD_4 (UART1 transmit alternate). |
| 7 | P1.5 | bidirectional | Standard I/O port P1.5, also SPI clock SCLK and I2C clock SCL. |
| 8 | P1.6 | bidirectional | Standard I/O port P1.6, also RxD_3 (UART1 receive alternate), XTALO (external crystal output) and MCLKO_2 (main clock output); high-impedance input when used as external clock input pin. |
| 9 | P1.7 | bidirectional | Standard I/O port P1.7, also TxD_3 (UART1 transmit alternate) and XTALI (external crystal/clock input). |
| 10 | P4.5 | bidirectional | Standard I/O port P4.5 with full I/O function, configurable in four modes. |
| 11 | P4.6 | bidirectional | Standard I/O port P4.6 with full I/O function, configurable in four modes. |
| 12 | P4.7 | bidirectional | Standard I/O port P4.7 with full I/O function, configurable in four modes. |
| 13 | P5.4 | bidirectional | Standard I/O port P5.4, also RST (active-low reset input when configured as reset pin) and MCLKO (main clock output); powers up with internal 4K pull-up active for about 6.5 ms. |
| 14 | Vcc | power_in | Power supply pin; operating voltage 1.9V to 5.5V. |
| 15 | P5.5 | bidirectional | Standard I/O port P5.5. |
| 16 | Gnd | power_in | Ground pin. |
| 17 | P4.0 | bidirectional | Standard I/O port P4.0, also WR_3 (external bus write strobe alternate) and RxD2_2 (UART2 receive alternate). |
| 18 | P3.0 | bidirectional | Standard I/O port P3.0, also RxD (UART1 receive) and INT4 (external interrupt 4); weak pull-up after power-on and used with P3.1 for USB download mode detection. |
| 19 | P3.1 | bidirectional | Standard I/O port P3.1, also TxD (UART1 transmit); weak pull-up after power-on, must not be held low together with P3.0 and P3.2 at power-up unless USB ISP is intended. |
| 20 | P3.2 | bidirectional | Standard I/O port P3.2, also INT0 (external interrupt 0), SCLK_4 and I2C clock SCL_4; high-impedance input after power-on. |
| 21 | P3.3 | bidirectional | Standard I/O port P3.3, also INT1 (external interrupt 1), MISO_4 and I2C data SDA_4. |
| 22 | P3.4 | bidirectional | Standard I/O port P3.4, also T0 (Timer 0 external clock input), T1CLKO, MOSI_4 and CMPO (comparator output). |
| 23 | P3.5 | bidirectional | Standard I/O port P3.5, also T1 (Timer 1 external clock input), T0CLKO and SS_4 (SPI slave select). |
| 24 | P3.6 | bidirectional | Standard I/O port P3.6, also INT2 (external interrupt 2), WR_2 (external bus write), RxD_2 and CMP- (comparator negative input). |
| 25 | P4.1 | bidirectional | Standard I/O port P4.1, also ALE (address latch enable) and CMPO_2 (comparator output alternate). |
| 26 | P2.0 | bidirectional | Standard I/O port P2.0, also A8 (external bus address bit 8). |
| 27 | P4.2 | bidirectional | Standard I/O port P4.2, also RD_3 (external bus read alternate) and TxD2_2 (UART2 transmit alternate). |
| 28 | P2.1 | bidirectional | Standard I/O port P2.1, also A9 (external bus address bit 9). |
| 29 | P2.2 | bidirectional | Standard I/O port P2.2, also A10 (external bus address bit 10) and SS_2 (SPI slave select alternate). |
| 30 | P2.3 | bidirectional | Standard I/O port P2.3, also A11 (external bus address bit 11) and MOSI_2 (SPI alternate). |
| 31 | P2.4 | bidirectional | Standard I/O port P2.4, also A12 (external bus address bit 12), MISO_2 and I2C data SDA_2. |
| 32 | P2.5 | bidirectional | Standard I/O port P2.5, also A13 (external bus address bit 13), SCLK_2 and I2C clock SCL_2. |
| 33 | P2.6 | bidirectional | Standard I/O port P2.6, also A14 (external bus address bit 14). |
| 34 | P2.7 | bidirectional | Standard I/O port P2.7, also A15 (external bus address bit 15). |
| 35 | P0.0 | bidirectional | Standard I/O port P0.0, also AD0 (multiplexed address/data bus bit 0) and RxD3 (UART3 receive). |
| 36 | P0.1 | bidirectional | Standard I/O port P0.1, also AD1 (multiplexed address/data bus bit 1) and TxD3 (UART3 transmit). |
| 37 | P0.2 | bidirectional | Standard I/O port P0.2, also AD2 (multiplexed address/data bus bit 2) and RxD4 (UART4 receive). |
| 38 | P4.3 | bidirectional | Standard I/O port P4.3, also WR (external bus write strobe) and RxD_4 (UART1 receive alternate). |
| 39 | P0.3 | bidirectional | Standard I/O port P0.3, also AD3 (multiplexed address/data bus bit 3) and TxD4 (UART4 transmit). |
| 40 | P0.4 | bidirectional | Standard I/O port P0.4, also AD4 (multiplexed address/data bus bit 4) and T3 (Timer 3 external clock input). |
| 41 | P0.5 | bidirectional | Standard I/O port P0.5, also AD5 (multiplexed address/data bus bit 5) and T3CLKO (Timer 3 clock output). |
| 42 | P0.6 | bidirectional | Standard I/O port P0.6, also AD6 (multiplexed address/data bus bit 6) and T4 (Timer 4 external clock input). |
| 43 | P0.7 | bidirectional | Standard I/O port P0.7, also AD7 (multiplexed address/data bus bit 7) and T4CLKO (Timer 4 clock output). |
| 44 | P1.0 | bidirectional | Standard I/O port P1.0, also RxD2 (UART2 receive pin). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STC Micro |
| Package | LQFP-44(10x10) |
| Category | Embedded Processors & Controllers |
| Pins | 44 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Storage temperature |  | -55 |  | 150 | ℃ |  | 786 |
| Operating temperature |  | -40 |  | 85 | ℃ |  | 786 |
| Operating voltage |  | 1.9 |  | 5.5 | V |  | 786 |
| VDD to ground voltage | VDD | -0.3 |  | 5.5 | V |  | 786 |
| I/O port to ground voltage |  | -0.3 |  |  | V | max VDD+0.3 | 786 |
| Logic 1 to 0 transition current | ITL | 100 | 270 | 600 | uA | 端口电压 2.0V | 787 |
| I/O pull-up resistor | RPU | 5.8 | 5.9 | 6 | KΩ |  | 787 |
| Input low voltage (Schmitt trigger on) | VIL1 |  |  | 0.99 | V | 打开施密特触发 | 787 |
| Input low voltage (Schmitt trigger off) | VIL1 |  |  | 1.07 | V | 关闭施密特触发 | 787 |
| Input high voltage, normal I/O (Schmitt trigger on) | VIH1 | 1.18 |  |  | V | 打开施密特触发 | 787 |
| Input high voltage, normal I/O (Schmitt trigger off) | VIH1 | 1.09 |  |  | V | 关闭施密特触发 | 787 |
| Input high voltage, reset pin | VIH2 | 1.18 |  | 0.99 | V |  | 787 |
| Logic 0 input current | IIL |  |  | 50 | uA | 端口电压 0V | 787 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | PC |  | Accumulator contents and the contents of a sixteen-bit base register, which may be either the Data Pointer or the PC. In the latter case, the PC is incremented to the address of the following | 419 |

## CAD (KiCad official)

- Symbol: `STC8C2K64S4-36I-LQFP44`
- Footprint: `Package_QFP:LQFP-44_10x10mm_P0.8mm`
- 3D model: LQFP-44(10x10) (KiCad packages3D, STEP)
- 3D model files: `stc8c2k64s4-36i-lqfp44-etched.step` / `stc8c2k64s4-36i-lqfp44-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stc8c2k64s4-36i-lqfp44.step` / `stc8c2k64s4-36i-lqfp44.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [STC Micro datasheet](docs/stc8c2k64s4-36i-lqfp44-datasheet.pdf) (956 pp, sha256 `f8fa5bab02998432`, retrieved 2026-10-27, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `off` (skipped (clean text read)), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/stc8c2k64s4-36i-lqfp44-datasheet.pdf)