GMS81032 datasheet(37/101 Pages) HYNIX

tên linh kiện	GMS81032

Giải thích chi tiết về linh kiện	8-BIT SINGLE CHIP MICROCOMPUTERS

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3.3 PORT R2

3.3.1 PORT R2 Registers

REGISTERS

R2 I/O Data Direction Register

SYMBOL

R/W

RESET VALUE

ADDRESS

R2DD

00H

00C5H

R2 Data Register

R/W

Undefined

00C4H

Table 3.3 Port R2 Registers

R2DD7

R2DD6

R2DD5

R2DD4

R2DD3

R2DD2

R2DD1

R2DD0

<00C5H>

R2DD

bit

initial value

R/W

3.3.2 I/O Data Direction Register (R2DD)

R2 Data Direction Register(R2DD) is 8-bit register, and can assign input state or output

state or output state to each bit. If R2DD is ¡È1¡È, port R2 is in the output state, and if

¡È0¡È, it is in the input state.

R2DD is write-only register. Since R2DD is initialized as ¡È00H¡È in reset state, the

whole port R2 becomes input state.

R27

R26

R25

R24

R23

R22

R21

R20

<00C4H>

bit

initial value

R/W

3.3.3 Data Register (R2)

R2 Data Register(R2) is 8-bit register to store data of port R2.

When setted as the output state by R2DD, and data is written in R2, data is output into

R2 pin. When setted as input state, input state of pin is read.

The initial value of R2 is unknown in reset state.

Chapter 3. I/O PORT

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