ABOV SEMICONDUCTOR MC81F4204 - 10. I;O Ports; R0 Port Features and Registers; R1 Port Features and Registers; R3 Port Features and Registers

MC81F4204
64 April 24, 2012 Ver.1.41
10. I/O PORTS
The MC81F4204 microcontroller has three I/O ports, P0,P1 and P3. The CPU accesses ports by
writing or reading port register directly.
The R0 port has following features,
- 1-bit programmable I/O port.
- Schmitt trigger input, push-pull or open-drain output mode can be selected by software.
- A pull-up resistor can be specified in 1-bit.
- R00-R01 can be used as EXT10/SXin, EXT11/SXout
- R02-R07 can be used as EXT0-EXT5/AD0-AD5
- R02-R03 can be used as EC0, T0O/T0PWM
- R04-R05 can be used as EC1/SCK, T1O/T1PWM/SI
- R06-R07 can be used as EC2/SO, T2O
The R1 port has following features,
- 1-bit programmable I/O port.
- Schmitt trigger input, push-pull or open-drain output mode can be selected by software.
- A pull-up resistor can be specified in 1-bit.
- R10-R13 can be used as EXT6-EXT9/Vref, AN6-AN8
- R11-R13 can be used as PWM2O-PWM4O
- R12 can be used as BUZO
The R3 port has following features,
- 1-bit programmable I/O port.
- Schmitt trigger or normal input, push-pull or open-drain output mode can be selected by
software.
- R31 can be used as AN14
- R33-R34 can be used as Xout, Xin
- R35 can be used as RESETB