STK55C641 Key Features
- Operating voltage : 2.5V
- Maximum CPU operating frequency : 4MHz at 5V and 1.5MHz at 2.5V
- Dual oscillators
- 32.768 KHz crystal oscillator for LCD display and watch timer
- RC oscillator for system clock
- 40 segments and 16 mons output for LCD driver
- 1/5 bias, 1/16 duty and 64Hz frame frequency
- 1/4 bias, 1/8 duty and 128Hz frame frequency
- I/O port
- 30 I/O pins