MC80F0804D View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

MC80F0804D

8-BIT SINGLE-CHIP MICROCONTROLLERS

Unspecified 

9.3 R2 and R2IO register

R2 is an 8-bit CMOS bidirectional I/O port (address 0C4H). Each

I/O pin can independently used as an input or an output through

the R3IO register (address 0C5H). When R20 through R27 pins

are used as input ports, an on-chip pull-up resistor can be connect-

ed to them in 1-bit units with a pull-up selection register 2 (PU2).

R20 through R27 pins can be used to open drain output port by

setting the corresponding bit of the open drain selection register

2 (R2OD).

In addition, Port R2 is multiplexed with alternate functions. R23

R24,R25,and R26 can be used as ADC input channel 9 to 12 by

setting ADCM to enable ADC and select channel 9 to 12.

Port Pin

R20

R21

R22

R23

R24

R25

R26

R27

Alternate Function

-

-

-

AN9 (ADC input channel 9)

AN10 (ADC input channel 10)

AN11 (ADC input channel 11)

AN12 (ADC input channel 12)

-

MC80F0704/0708/0804/0808

R2 Data Register

ADDRESS: 0C4H

RESET VALUE: 00H

R2

R27 R26 R25 R24 R23 R22 R21 R20

Input / Output data

R2 Direction Register

R2IO

ADDRESS: 0C5H

RESET VALUE: 00H

R2 Pull-up

Selection Register

PU2

Port Direction

0: Input

1: Output

ADDRESS: 0FEH

RESET VALUE: 00H

R2 Open Drain

Selection Register

R2OD

Pull-up Resister Selection

0: Disable

1: Enable

ADDRESS: 0CAH

RESET VALUE: 00H

Open Drain Resister Selection

0: Disable

1: Enable

October 31, 2011 Ver 1.03

41

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