MC80F0804D View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

MC80F0804D

8-BIT SINGLE-CHIP MICROCONTROLLERS

Unspecified 

MC80F0704/0708/0804/0808

9.4 R3 and R3IO register

R3 is a 6-bit CMOS bidirectional I/O port (address 0C6H). Each

I/O pin (except R35) can independently used as an input or an

output through the R3IO register (address 0C7H). R35 is an input

only port. When R30 through R35 pins are used as input ports, an

on-chip pull-up resistor can be connected to them in 1-bit units

with a pull-up selection register 3 (PU3). R30 through R34 pins

can be used to open drain output port by setting the corresponding

bit of the open drain selection register 1 (R3OD).

In addition, Port R3 is multiplexed with alternate functions. R30

R31,and R32 can be used as ADC input channel 13,14 and 15 by

setting ADCM to enable ADC and select channel 13,14 and 15.

Port Pin

R30

R31

R32

Alternate Function

AN13 (ADC input channel 13)

AN14 (ADC input channel 14)

AN15 (ADC input channel 15)

R33, R34 and R35 is multiplexed with XIN, XOUT, and RESET

pin.

R3 Data Register

ADDRESS: 0C6H

RESET VALUE: 00H

R3

- - R35 R34 R33 R32 R31 R30

Input / Output data

Input data

R3 Direction Register

R3IO - - -

ADDRESS: 0C7H

RESET VALUE: 00H

R3 Pull-up

Selection Register

PU3

--

Port Direction

0: Input

1: Output

ADDRESS: 0FDH

RESET VALUE: 00H

R3 Open Drain

Selection Register

R3OD

Pull-up Resister Selection

0: Disable

1: Enable

ADDRESS: 0CBH

RESET VALUE: ---0 000-B

Open Drain Resister Selection

0: Disable

1: Enable

42

October 31, 2011 Ver 1.03

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