MC81F4204M datasheet(62/150 Pages) FINECHIPS

Part #	MC81F4204M

Description	ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS

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MC81F4204

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October 19, 2009 Ver.1.35

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

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