MC80F0204 Datasheet, PDF(40/126 Page) List of Unclassifed Manufacturers

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MC80F0204 Datasheet, PDF (40/126 Pages) List of Unclassifed Manufacturers – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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MC80F0104/0204

Preliminary

9.3 R3 and R3IO register

R3 is a 5-bit CMOS bidirectional I/O port (address 0C6H).

Each I/O pin (except R35) can independently used as an in-

put or an output through the R3IO register (address 0C7H).

R35 is an input only port. When R31 through R35 pins are

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

nected to them in 1-bit units with a pull-up selection regis-

ter 3 (PU3). R31 through R34 pins can be used to open

drain output port by setting the corresponding bit of the

open drain selection register 3 (R3OD).

In addition, Port R3 is multiplexed with alternate func-

tions. R31 and R32 can be used as ADC input channel 14

and 15 by setting ADCM to enable ADC and select chan-

nel 14 and 15.

Port Pin

R31

R32

Alternate Function

AN14 (ADC input channel 14)

AN15 (ADC input channel 15)

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

RESET pin. These pins can be used as general I/O pins by

setting writing option described in "23. Device Configura-

tion Area" on page 102.

R3 Data Register

ADDRESS: 0C6H

RESET VALUE: --00 000-B

- - R35 R34 R33 R32 R31 -

Input / Output data

Input data

R3 Direction Register

R3IO - - -

ADDRESS: 0C7H

RESET VALUE: ---0 000-B

R3 Pull-up

Selection Register

PU3

Port Direction

0: Input

1: Output

ADDRESS: 0FFH

RESET VALUE: --00 000-B

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

Mar. 2005 Ver 0.2

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