STC8A8K64D4-45I-LQFP48 from STC Micro, in a LQFP-48(7x7). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	P5.2/RxD4_2	bidirectional	General-purpose I/O P5.2. Alternate: UART4 receive (RxD4_2).
2	P5.3/TxD4_2	bidirectional	General-purpose I/O P5.3. Alternate: UART4 transmit (TxD4_2).
3	P1.1/ADC1/PWM1_2/TxD2	bidirectional	General-purpose I/O P1.1. Alternates: 12-bit ADC channel 1, enhanced PWM channel 1 output (PWM1_2), UART2 transmit (TxD2).
4	P1.2/ADC2/PWM2_2/SS/T2/ECI/ADC_ETR	bidirectional	General-purpose I/O P1.2. Alternates: ADC channel 2, PWM2 output, SPI slave-select, Timer 2 external clock input, PCA external pulse input (ECI), ADC external trigger (ADC_ETR).
5	P1.3/ADC3/PWM3_2/MOSI/T2CLKO	bidirectional	General-purpose I/O P1.3. Alternates: ADC channel 3, PWM3 output, SPI MOSI, Timer 2 divided-clock output (T2CLKO).
6	P1.4/ADC4/PWM4_2/MISO/SDA/CCP3	bidirectional	General-purpose I/O P1.4. Alternates: ADC channel 4, PWM4 output, SPI MISO, I2C SDA (default mapping), PCA CCP3 capture/compare.
7	P4.4/RD/TxD_4	bidirectional	General-purpose I/O P4.4. Alternates: external-bus read strobe (RD), UART1 transmit alt-4 (TxD_4).
8	P1.5/ADC5/PWM5_2/SCLK/SCL/CCP2	bidirectional	General-purpose I/O P1.5. Alternates: ADC channel 5, PWM5 output, SPI SCLK, I2C SCL (default mapping), PCA CCP2 capture/compare.
9	P1.6/ADC6/RxD_3/PWM6_2/MCLKO_2/CCP1/XTALO	bidirectional	General-purpose I/O P1.6. Alternates: ADC channel 6, UART1 receive alt-3 (RxD_3), PWM6 output, master clock divided output (MCLKO_2), PCA CCP1, external crystal output (XTALO).
10	P1.7/ADC7/TxD_3/PWM7_2/CCP0/XTALI	bidirectional	General-purpose I/O P1.7. Alternates: ADC channel 7, UART1 transmit alt-3 (TxD_3), PWM7 output, PCA CCP0, external crystal / external clock input (XTALI).
11	ADC_AGnd	power_in	ADC analog ground reference. Tie to system GND via a clean analog return.
12	ADC_VRef+	power_in	ADC positive voltage reference input. External reference required in range 2.4 V to MCU-VCC.
13	ADC_AVcc	power_in	ADC analog supply. Connect to MCU VCC via ferrite/RC filter for best analog performance.
14	P5.4/NRST/MCLKO	bidirectional	General-purpose I/O P5.4. Alternates: active-low external reset (NRST), master clock divided output (MCLKO). Function selected in RSTCFG / on-chip option bytes.
15	Vcc	power_in	Main digital supply pin. Operating range per datasheet (typ 2.5 V - 5.5 V for -45I grade). Decouple with 10 uF bulk + 0.1 uF ceramic close to the pin.
16	P5.5	bidirectional	General-purpose I/O P5.5. No alternate function on this variant.
17	Gnd	power_in	Digital ground return pin.
18	P4.0/WR_3/RxD2_2	bidirectional	General-purpose I/O P4.0. Alternates: external-bus write strobe alt-3 (WR_3), UART2 receive alt-2 (RxD2_2).
19	P3.0/RxD/CCP3_4/INT4	bidirectional	General-purpose I/O P3.0. Alternates: UART1 receive (RxD, default mapping), PCA CCP3 alt-4, external interrupt 4 (INT4).
20	P3.1/TxD/CCP2_4	bidirectional	General-purpose I/O P3.1. Alternates: UART1 transmit (TxD, default mapping), PCA CCP2 alt-4.
21	P3.2/INT0/CCP1_4/SCLK_4/SCL_4	bidirectional	General-purpose I/O P3.2. Alternates: external interrupt 0 (INT0), PCA CCP1 alt-4, SPI SCLK alt-4, I2C SCL alt-4.
22	P3.3/INT1/CCP0_4/MISO_4/SDA_4	bidirectional	General-purpose I/O P3.3. Alternates: external interrupt 1 (INT1), PCA CCP0 alt-4, SPI MISO alt-4, I2C SDA alt-4.
23	P3.4/T0/T1CLKO/MOSI_4/CMPO	bidirectional	General-purpose I/O P3.4. Alternates: Timer 0 external clock in (T0), Timer 1 divided-clock output (T1CLKO), SPI MOSI alt-4, comparator output (CMPO).
24	P3.5/T1/T0CLKO/ECI_4/SS_4/PWMFLT	bidirectional	General-purpose I/O P3.5. Alternates: Timer 1 external clock in (T1), Timer 0 divided-clock output (T0CLKO), PCA ECI alt-4, SPI SS alt-4, PWM fault-detect input (PWMFLT).
25	P5.0/RxD3_2/CMP+_2	bidirectional	General-purpose I/O P5.0. Alternates: UART3 receive alt-2 (RxD3_2), analog comparator positive input CMP+_2.
26	P5.1/TxD3_2/CMP+_3	bidirectional	General-purpose I/O P5.1. Alternates: UART3 transmit alt-2 (TxD3_2), analog comparator positive input CMP+_3.
27	P3.6/INT2/WR_2/RxD_2/CMP-	bidirectional	General-purpose I/O P3.6. Alternates: external interrupt 2 (INT2), external-bus write strobe alt-2 (WR_2), UART1 receive alt-2 (RxD_2), analog comparator negative input (CMP-).
28	P3.7/INT3/RD_2/TxD_2/CMP+	bidirectional	General-purpose I/O P3.7. Alternates: external interrupt 3 (INT3), external-bus read strobe alt-2 (RD_2), UART1 transmit alt-2 (TxD_2), comparator positive input (CMP+).
29	P4.1/ALE/CMPO_2	bidirectional	General-purpose I/O P4.1. Alternates: external-bus address-latch enable (ALE), comparator output alt-2 (CMPO_2).
30	P2.0/A8/PWM0	bidirectional	General-purpose I/O P2.0. Alternates: external-bus address line A8, enhanced PWM channel 0 output (PWM0).
31	P4.2/RD_3/TxD2_2	bidirectional	General-purpose I/O P4.2. Alternates: external-bus read strobe alt-3 (RD_3), UART2 transmit alt-2 (TxD2_2).
32	P2.1/A9/PWM1	bidirectional	General-purpose I/O P2.1. Alternates: address line A9, PWM1 output.
33	P2.2/A10/PWM2/SS_2/ECI_2	bidirectional	General-purpose I/O P2.2. Alternates: address line A10, PWM2 output, SPI slave-select alt-2 (SS_2), PCA ECI alt-2.
34	P2.3/A11/PWM3/MOSI_2/CCP0_2	bidirectional	General-purpose I/O P2.3. Alternates: address line A11, PWM3 output, SPI MOSI alt-2, PCA CCP0 alt-2.
35	P2.4/A12/PWM4/MISO_2/SDA_2/CCP1_2	bidirectional	General-purpose I/O P2.4. Alternates: address line A12, PWM4 output, SPI MISO alt-2, I2C SDA alt-2, PCA CCP1 alt-2.
36	P2.5/A13/PWM5/SCLK_2/SCL_2/CCP2_2	bidirectional	General-purpose I/O P2.5. Alternates: address line A13, PWM5 output, SPI SCLK alt-2, I2C SCL alt-2, PCA CCP2 alt-2.
37	P2.6/A14/PWM6/CCP3_2	bidirectional	General-purpose I/O P2.6. Alternates: address line A14, PWM6 output, PCA CCP3 alt-2.
38	P2.7/A15/PWM7	bidirectional	General-purpose I/O P2.7. Alternates: address line A15, PWM7 output.
39	P0.0/AD0/ADC8/RxD3	bidirectional	General-purpose I/O P0.0. Alternates: external-bus address/data line AD0, ADC channel 8, UART3 receive (RxD3).
40	P0.1/AD1/ADC9/TxD3	bidirectional	General-purpose I/O P0.1. Alternates: AD1, ADC channel 9, UART3 transmit (TxD3).
41	P0.2/AD2/ADC10/RxD4	bidirectional	General-purpose I/O P0.2. Alternates: AD2, ADC channel 10, UART4 receive (RxD4).
42	P4.3/WR/RxD_4	bidirectional	General-purpose I/O P4.3. Alternates: external-bus write strobe (WR, default), UART1 receive alt-4 (RxD_4).
43	P0.3/AD3/ADC11/TxD4	bidirectional	General-purpose I/O P0.3. Alternates: AD3, ADC channel 11, UART4 transmit (TxD4).
44	P0.4/AD4/ADC12/T3	bidirectional	General-purpose I/O P0.4. Alternates: AD4, ADC channel 12, Timer 3 external clock input (T3).
45	P0.5/AD5/ADC13/T3CLKO	bidirectional	General-purpose I/O P0.5. Alternates: AD5, ADC channel 13, Timer 3 divided-clock output (T3CLKO).
46	P0.6/AD6/ADC14/T4	bidirectional	General-purpose I/O P0.6. Alternates: AD6, ADC channel 14, Timer 4 external clock input (T4).
47	P0.7/AD7/T4CLKO	bidirectional	General-purpose I/O P0.7. Alternates: AD7, Timer 4 divided-clock output (T4CLKO). (No ADC channel on this variant.)
48	P1.0/ADC0/PWM0_2/RxD2	bidirectional	General-purpose I/O P1.0. Alternates: ADC channel 0, PWM0 output, UART2 receive (RxD2).

Key specifications

Parameter	Value
Manufacturer	STC Micro
Package	LQFP-48(7x7)
Category	MCU
Pins	48

Ordering variants

Same part, different packaging or reel option.

STC8A8K64D4-45I-LQFP48
STC8A8K64D4-45I-QFN48
STC8A8K64D4-45I-LQFP64
STC8A8K64D4-45I-QFN64
STC8A8K64D4-45I-LQFP44
STC8A8K64D4-45I-PDIP40

CAD (KiCad official)

Symbol: STC8A8K64D4-45I-LQFP48
Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
3D model: LQFP-48(7x7) (KiCad packages3D, STEP)

Provenance

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

Datasheet: STC Micro datasheet (1168 pp, sha256 0df2991ceeae5ee1, retrieved 2026-08-17, 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: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF