This is an Arduino sketch to initialize LDROM (bootloader) for Nuvoton MCU (e.g. N76E003). Once initialized, MCU can be programmed using any UART-TTL converter.
ICP programmer schematic:
Arduino Nuvoton
5V --- VDD
Pin #5 --- DAT (P1.6)
Pin #6 --- CLK (P0.2)
Pin #9 --- RST (P2.0)
GND --- GND
Builtin led indicates error. If everything goes well then it will turn off.
LDROM code is in ldrom/ISP_UART0.ihx. Use hex2c to
convert it to C Include file.
Note: bootloader occupies 2KB of Flash memory.
Note: any locked chip will be erased.