MC81F4x16
10. I/O PORTS
The MC81F4x16 microcontroller has six I/O ports, P0-P5. 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
- R14-R17 can be used as RxD, TxD, SDA, SCL
The R2 port has following features,
- 1-bit programmable I/O port.
- Input, push-pull or open-drain output mode can be selected by software.
- A pull-up resistor can be specified in 1-bit.
- R20 can be used as AN9
- R25-R27 can be used as AN10-AN12
72
October 19, 2009 Ver.1.35
FINECHIPS [ FINECHIPS ]
