UPD17P709 Key Features
- I/O ports : 46
- Input ports : 12
- Output ports : 4
- Address stack : 15 levels
- Interrupt stack : 4 levels
- DBF stack : 4 levels (operated by software)
- External : 6 (CE rising edge and INT0 to INT4)
- 3-wire serial I/O
- 2-wire serial I/O/I2C bus
- Direct frequency division system (VCOL pin (MF mode) : 0.5 to 3 MHz)