MEGAWIN

MLC0xxB Series Technical Summary

21

I/O Ports

Port 0

Address

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

R

W

00D8H

P0

P07

P06

P05

P04

P03

P02

P01

P00

√

√

0240H

P0CR

CP07

CP06

CP05

CP04

CP03

CP02

CP01

CP00

√

√

0241H

P0MR

-

MP06

MP05

MP04

-

MP02

MP01

MP00

√

√

Port 0 is an 8-bit I/O port; each pin can be programmed as input or output individually.

P0CR: p0.0~p0.7 is input or output. 0: input, 1: output

P0MR: p0.0~p0.7, pull-high, CMOS/NMOS and pull-high value setting

P0MR.0: P0.0 ~ P0.3 Pull-high control, 0: disable, 1:enable

P0MR.1: P0.0 ~ P0.3 CMOS/NMOS selector, 0: CMOS, 1:NMOS

P0MR.2: P0.0 ~ P0.3 Pull-high resistor value control, 0: large, 1: small

P0MR.4: P0.4 ~ P0.7 Pull-high control, 0: disable, 1: enable

P0MR.5: P0.4 ~ P0.7 CMOS/NMOS selector, 0: CMOS, 1:NMOS

P0MR.6: P0.4 ~ P0.7 Pull-high resistor value control, 0: large, 1: small (350K or 50K selector)

At initial reset, the port P0 is all in input mode. Each pin of port P0 can be specified as input or output

mode independently by the P0CR registers. When P0 is used as output port, CMOS or NMOS open

drain output type can be selected by the P0MR register. Port P0 has the internal pull-high resistors

that can be enabled/disabled by specifying the P0MR.0 and P0MR.4 respectively. The pull-high

IRQ_EN corresponding to the P0 port are set, a signal change at the port P0 (any pin) will execute the

The Schmitt trigger circuit is added in the input port part of all I/O pins.

Please set port 0 as output high before set it as input mode, if speeds up the internal pull-high effect is

output mode to avoid unnecessary power consumption.