STC89C52RC-40I-LQFP44

{
  "schema_version": 1,
  "type": "component",
  "slug": "stc89c52rc-40i-lqfp44",
  "title": "STC89C52RC-40I-LQFP44",
  "brief": "STC Micro Microcontrollers (MCU/MPU/SOC), LQFP-44(10x10). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "mcu",
    "stc89c52rc-40i-lqfp44"
  ],
  "component": {
    "mpn": "STC89C52RC-40I-LQFP44",
    "manufacturer": "STC Micro",
    "package": "LQFP-44(10x10)",
    "pin_count": 44,
    "category": "MCU",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/5a17a78212f2e06d8b3a80c8c6ebc011.pdf",
    "parts": {
      "symbol": "stc89c52rc-40i-lqfp44.kicad_sym",
      "footprint": "stc89c52rc-40i-lqfp44.kicad_mod",
      "model_3d": "stc89c52rc-40i-lqfp44-etched.glb",
      "model_3d_plain": "stc89c52rc-40i-lqfp44.glb",
      "model_3d_step": "stc89c52rc-40i-lqfp44-etched.step",
      "model_3d_step_plain": "stc89c52rc-40i-lqfp44.step",
      "lbr": "stc89c52rc-40i-lqfp44.lbr"
    },
    "distributor_links": {
      "lcsc": "C8707"
    },
    "pins": [
      {
        "number": "1",
        "name": "P1.5",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port PORT1[5]. Internal weak pull-up; drives/reads CMOS level."
      },
      {
        "number": "2",
        "name": "P1.6",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port PORT1[6]. Optionally connects to external crystal for the on-chip USB-serial helper circuit in some board layouts."
      },
      {
        "number": "3",
        "name": "P1.7",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port PORT1[7]."
      },
      {
        "number": "4",
        "name": "RST",
        "type": "input",
        "description": "Active-high reset input. HD-version parts have an internal 45k-100k pull-down to GND; hold high for at least two machine cycles to reset the MCU."
      },
      {
        "number": "5",
        "name": "P3.0/RxD",
        "type": "bidirectional",
        "description": "P3.0 general-purpose I/O; alternate function RxD = UART1 serial data receive input."
      },
      {
        "number": "6",
        "name": "P4.3/INT2",
        "type": "bidirectional",
        "description": "P4.3 general-purpose I/O; alternate function INT2 = external interrupt 2 (falling-edge or low-level trigger)."
      },
      {
        "number": "7",
        "name": "P3.1/TxD",
        "type": "bidirectional",
        "description": "P3.1 general-purpose I/O; alternate function TxD = UART1 serial data transmit output."
      },
      {
        "number": "8",
        "name": "P3.2/INT0",
        "type": "bidirectional",
        "description": "P3.2 general-purpose I/O; alternate function INT0 = external interrupt 0 (falling-edge or low-level trigger)."
      },
      {
        "number": "9",
        "name": "P3.3/INT1",
        "type": "bidirectional",
        "description": "P3.3 general-purpose I/O; alternate function INT1 = external interrupt 1 (falling-edge or low-level trigger)."
      },
      {
        "number": "10",
        "name": "P3.4/T0",
        "type": "bidirectional",
        "description": "P3.4 general-purpose I/O; alternate function T0 = Timer/Counter 0 external clock/count input."
      },
      {
        "number": "11",
        "name": "P3.5/T1",
        "type": "bidirectional",
        "description": "P3.5 general-purpose I/O; alternate function T1 = Timer/Counter 1 external clock/count input."
      },
      {
        "number": "12",
        "name": "P3.6/WR",
        "type": "bidirectional",
        "description": "P3.6 general-purpose I/O; alternate function WR = active-low external data memory write strobe (for MOVX instructions)."
      },
      {
        "number": "13",
        "name": "P3.7/RD",
        "type": "bidirectional",
        "description": "P3.7 general-purpose I/O; alternate function RD = active-low external data memory read strobe (for MOVX instructions)."
      },
      {
        "number": "14",
        "name": "XTAL2",
        "type": "output",
        "description": "Output of the internal inverting oscillator amplifier; connect to the second lead of the external crystal. If an external clock source is used on XTAL1, XTAL2 outputs the buffered clock and may be left floating."
      },
      {
        "number": "15",
        "name": "XTAL1",
        "type": "input",
        "description": "Input to the internal inverting oscillator amplifier; connect to one lead of the external crystal or directly to an external clock source."
      },
      {
        "number": "16",
        "name": "GND",
        "type": "power_in",
        "description": "Digital ground (0 V reference)."
      },
      {
        "number": "17",
        "name": "P4.0",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port PORT4[0]. Present only on LQFP-44/PLCC-44 packages (not on PDIP-40)."
      },
      {
        "number": "18",
        "name": "P2.0",
        "type": "bidirectional",
        "description": "P2 quasi-bidirectional I/O with internal pull-ups. Doubles as high address byte A8 when accessing external memory via MOVX @DPTR / MOVC."
      },
      {
        "number": "19",
        "name": "P2.1",
        "type": "bidirectional",
        "description": "P2 quasi-bidirectional I/O; doubles as external address bit A9."
      },
      {
        "number": "20",
        "name": "P2.2",
        "type": "bidirectional",
        "description": "P2 quasi-bidirectional I/O; doubles as external address bit A10."
      },
      {
        "number": "21",
        "name": "P2.3",
        "type": "bidirectional",
        "description": "P2 quasi-bidirectional I/O; doubles as external address bit A11."
      },
      {
        "number": "22",
        "name": "P2.4",
        "type": "bidirectional",
        "description": "P2 quasi-bidirectional I/O; doubles as external address bit A12."
      },
      {
        "number": "23",
        "name": "P2.5",
        "type": "bidirectional",
        "description": "P2 quasi-bidirectional I/O; doubles as external address bit A13."
      },
      {
        "number": "24",
        "name": "P2.6",
        "type": "bidirectional",
        "description": "P2 quasi-bidirectional I/O; doubles as external address bit A14."
      },
      {
        "number": "25",
        "name": "P2.7",
        "type": "bidirectional",
        "description": "P2 quasi-bidirectional I/O; doubles as external address bit A15."
      },
      {
        "number": "26",
        "name": "P4.4/PSEN",
        "type": "bidirectional",
        "description": "P4.4 general-purpose I/O; alternate function PSEN = Program Store Enable, active-low strobe for external program memory reads."
      },
      {
        "number": "27",
        "name": "P4.5/ALE",
        "type": "bidirectional",
        "description": "P4.5 general-purpose I/O; alternate function ALE = Address Latch Enable output for demultiplexing the low address byte on P0 during external memory access. Also acts as PROG programming pulse input during Flash ISP."
      },
      {
        "number": "28",
        "name": "P4.1",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port PORT4[1]. Present only on LQFP-44/PLCC-44 packages."
      },
      {
        "number": "29",
        "name": "P4.6/EA",
        "type": "bidirectional",
        "description": "P4.6 general-purpose I/O; alternate function EA = External Access Enable. Internally pulled up to VCC: floating or tied high starts execution from internal Flash; tied to GND starts execution from external program memory."
      },
      {
        "number": "30",
        "name": "P0.7/AD7",
        "type": "bidirectional",
        "description": "P0.7 8-bit quasi-bidirectional I/O (open-drain after reset; requires 4.7k-10k external pull-up when used as GPIO). Doubles as multiplexed low address/data line AD7 during external memory access (no external pull-up needed in bus mode)."
      },
      {
        "number": "31",
        "name": "P0.6/AD6",
        "type": "bidirectional",
        "description": "P0.6 open-drain quasi-bidirectional I/O; doubles as multiplexed address/data line AD6."
      },
      {
        "number": "32",
        "name": "P0.5/AD5",
        "type": "bidirectional",
        "description": "P0.5 open-drain quasi-bidirectional I/O; doubles as multiplexed address/data line AD5."
      },
      {
        "number": "33",
        "name": "P0.4/AD4",
        "type": "bidirectional",
        "description": "P0.4 open-drain quasi-bidirectional I/O; doubles as multiplexed address/data line AD4."
      },
      {
        "number": "34",
        "name": "P0.3/AD3",
        "type": "bidirectional",
        "description": "P0.3 open-drain quasi-bidirectional I/O; doubles as multiplexed address/data line AD3."
      },
      {
        "number": "35",
        "name": "P0.2/AD2",
        "type": "bidirectional",
        "description": "P0.2 open-drain quasi-bidirectional I/O; doubles as multiplexed address/data line AD2."
      },
      {
        "number": "36",
        "name": "P0.1/AD1",
        "type": "bidirectional",
        "description": "P0.1 open-drain quasi-bidirectional I/O; doubles as multiplexed address/data line AD1."
      },
      {
        "number": "37",
        "name": "P0.0/AD0",
        "type": "bidirectional",
        "description": "P0.0 open-drain quasi-bidirectional I/O; doubles as multiplexed address/data line AD0."
      },
      {
        "number": "38",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive supply. 5V for STC89C52RC (operating range typically 3.8-5.5 V); 3.3V for STC89LE52RC (2.0-3.6 V). Decouple with 100 nF + 10 uF close to the pin."
      },
      {
        "number": "39",
        "name": "P4.2/INT3",
        "type": "bidirectional",
        "description": "P4.2 general-purpose I/O; alternate function INT3 = external interrupt 3 (falling-edge or low-level trigger)."
      },
      {
        "number": "40",
        "name": "P1.0/T2",
        "type": "bidirectional",
        "description": "P1.0 general-purpose I/O; alternate function T2 = Timer/Counter 2 external clock/count input."
      },
      {
        "number": "41",
        "name": "P1.1/T2EX",
        "type": "bidirectional",
        "description": "P1.1 general-purpose I/O; alternate function T2EX = Timer 2 capture/reload trigger control input."
      },
      {
        "number": "42",
        "name": "P1.2",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port PORT1[2]."
      },
      {
        "number": "43",
        "name": "P1.3",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port PORT1[3]."
      },
      {
        "number": "44",
        "name": "P1.4",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port PORT1[4]."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/5a17a78212f2e06d8b3a80c8c6ebc011.pdf",
        "pages": 1691,
        "sha256": "fac7be430b93e2dd",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 44,
        "described": 44,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -5.6625,
        -4
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "LQFP-44_10x10mm_P0.8mm@sha256:a24003d5101dbf25",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "stc89c52rc-40i-lqfp44.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          12,
          12,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "81aae6270b5c742bed79a8a35e9adf7fbed97c42e341e6b25ab20c1783b93b5d",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "stc89c52rc-40i-lqfp44-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          12,
          12,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "607d9fa9cc92406bfec8aafdd487036331cd91df3134c34df6e79b15dcde0782",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "STC Micro",
      "Package": "LQFP-44(10x10)",
      "Category": "MCU",
      "Pins": "44"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "stc89c52rc-40i-lqfp44"
  ],
  "discovery_pitch": "STC89C52RC-40I-LQFP44 (STC Micro) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "stc89c52rc-40i-lqfp44.kicad_sym",
    "stc89c52rc-40i-lqfp44.kicad_mod",
    "stc89c52rc-40i-lqfp44.glb",
    "stc89c52rc-40i-lqfp44.step",
    "stc89c52rc-40i-lqfp44-etched.step",
    "stc89c52rc-40i-lqfp44.lbr",
    "docs/hero.png",
    "docs/stc89c52rc-40i-lqfp44-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
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  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "STC89C52RC-40I-LQFP44",
      "kind": "packaging"
    },
    {
      "mpn": "STC89LE52RC-40I-LQFP44",
      "kind": "unknown"
    },
    {
      "mpn": "STC89C52RC-40I-PDIP40",
      "kind": "unknown"
    },
    {
      "mpn": "STC89C52RC-40C-PDIP40",
      "kind": "unknown"
    },
    {
      "mpn": "STC89C52RC-40I-PLCC44",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-25T08:28:52.300Z"
}