About

Instructions to download programs to (some) Intel MCS-51 compatible MCUs.

Parts

AT89S51

Note	Same applies to AT89S52.

STC89C51RC

Note	Same applies to STC89C52RC and STC12C5A6S2.

Dependencies

Hardware

AT89S51, AT89S52

• Arduino board (e.g. Nano, Micro, etc.) — 1 piece

• Microcontroller — 1 piece

• Breadboard — 2 pieces

• Jumper wires — ~20 pieces

• LEDs — 1 red, 1 green, 1 yellow, 1 white

• 1-10kΩ resistors — 2 pieces

• 8-33MHz quartz crystal — 1 piece

• 22pF capacitors — 2 pieces

• 10-pin ribbon cable — 1 piece

• 10-pin to 6-pin adapter — 2 pieces

• Push-button (NO) — 1 piece

STC89C51RC, STC89C52RC, STC12C5A60S2

• USB to Serial/TTL adapter (e.g. CH340G, PL2303, etc.) — 1 piece

• Microcontroller — 1 piece

• Breadboard — 1 piece

• Jumper wires — ~10 pieces

• LEDs — 1 white

• 1-10kΩ resistors — 1 pieces

• 8-33MHz quartz crystal — 1 piece

• 22pF capacitors — 2 pieces

• Push-button (NO) — 1 piece

Software

AT89S51, AT89S52

• MCU 8051 IDE

• Arduino IDE — 1.8.x or above should work

• avrdude — the Arduino IDE distribution contains a recent binary

Important

Upload the ArduinoISP sketch onto the Arduino board.

STC89C51RC, STC89C52RC, STC12C5A60S2

• MCU 8051 IDE

• stcgal

Programming

Compile binary

Windows and Unix

mcu8051ide --no-bin --no-sim --assemble blink.asm

The output is blink.hex.

Downloading

AT89S51, AT89S52

Windows

avrdude -C %AVRDUDE_HOME%/etc/avrdude.conf -C +./etc/avrdude.conf -c avrisp -p AT89S51 -P COM7 -b 19200 -U flash:w:blink.hex:i

STC89C51RC, STC89C52RC, STC12C5A60S2

Windows

stcgal -p COM7 blink.hex // (1)

1. Executing this displays Waiting for MCU, please cycle power. Simply disconnect then reconnect VCC.