Epson E0C6001 Technical Manual page 107

Cmos 4-bit single chip microcomputer

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E0C6001 TECHNICAL SOFTWARE

Fig. 3.4.2

Control of I/O port (input)

II-26

• Loading P00–P03 output data into A register

Label

Mnemonic/operand

Y,0FCH

MY,0001B

Y,0F6H

A,MY

As shown in Figure 3.4.2, the four instruction steps above

load the data of the I/O ports into the A register.

P03

P02

A register

Data can be loaded from the I/O port into the B register or

MX instead of the A register.

Comment

;

Set the address of input/output

;

port control register

;

Set as output port

;

Set the address of port

A register ← P00–P03

;

P01

P00

Data register

P00

P01

P02

P03

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