Epson E0C6001 Technical Manual page 96

Cmos 4-bit single chip microcomputer

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• Bit-unit checking of input ports

Label

Mnemonic/operand

INPUT1: FAN

INPUT2: FAN

This program loopes until a rising edge is input to input port

K01.

The input port can be addressed using the X register instead

of the Y register.

Note

When the input port is changed from high level to low level with a

pull-down resistor, the signal falls following a certain delay caused

by the time constants of the pull-down resistance and the input

gate capacitance. It is therefore necessary to observe a proper

wait time before the input port data is read.

CHAPTER 3: PERIPHERAL CIRCUITS (Input Port)

Comment

;

Disable interrupt

Y,0E0H

;

Set address of port

MY,0010B

;

NZ,INPUT1

;

Loop until K01 becomes "0"

MY,0010B

;

Z,INPUT2

;

Loop until K01 becomes "1"

II-15

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