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sinodude-serial

AVR-based programmer firmware for SinoWealth 8051 microcontrollers using the ICP protocol.

Supported Controllers

  • ATmega328P (Arduino Nano)
  • ATmega328PB (Arduino Nano derivatives)

Pin Connections

Arduino Nano Pin Function SinoWealth Target
D2 TDO Test Data Out
D3 TMS Test Mode Select
D4 TDI Test Data In
D5 TCK Test Clock
D6 POWER VCC (via MOSFET)
GND GND Ground

Power Control Circuit

The programmer controls power to the target using a P-channel MOSFET. This allows power cycling on command which is required for entering ICP mode.

     VCC -------+--------+
(Arduino 5V)    |        |
             [ 10k ] +-- S --+
                |    |       |
     D6 --------+--- G       D --------> Target VCC
                     | P-MOS |
                     +-------+

Components:

  • P-channel MOSFET (e.g., IRF9540, IRFU9024, or similar logic-level MOSFET)
  • 10K resistor (pull-up from gate to source)

How it works:

  • When D6 is LOW, Vgs becomes negative, MOSFET turns ON, power flows to target
  • When D6 is HIGH (or floating), gate is pulled to source via 10K resistor (Vgs=0), MOSFET turns OFF
  • The 10K resistor ensures the MOSFET stays OFF during Arduino reset

Acknowledgments

The sinodude-serial programmer wouldn't have been possible if not for the reverse engineering work by gashtaan and his open-source projects: