GMS81032 datasheet(33/101 Pages) HYNIX

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Chapter 3. I/O PORT

CHAPTER 3. I/O PORTS

The GMS810series has 21 I/O ports which are PORT0(8 I/O), PORT1 (8 I/O) and

PORT2 (8 I/O). Each port contains data direction register which controls I/O and data

3.1 PORT R0

3.1.1 PORT R0 Registers

R0 I/O Data Direction Register

SYMBOL

R/W

RESET VALUE

ADDRESS

R0DD

00H

00C1H

R0 Data Register

R/W

Undefined

00C0H

Table 3.1 Port R0 Registers

3.1.2 I/O Data Direction Register (R0DD)

R0DD7

R0DD6

R0DD5

R0DD4

R0DD3

R0DD2

R0DD1

R0DD0

<00C1H>

R0DD

bit

initial value

R/W

R0 I/O Data Direction Register(R0DD) is 8-bit register, and can assign input state or

output state to each bit. If R0DD is ¡È1¡È, port R0 is in the output state, and if ¡È0¡È, it is

in the input state. R0DD is write-only register. Since R0DD is initialized as ¡È00H¡È in

reset state, the whole port R0 becomes input state.

3.1.1 Data Register(R0)

R07

R06

R05

R04

R03

R02

R01

R00

<00C0H>

bit

initial value

R/W

PORT0 data register (R0) is 8-bit register to store data of port R0.

When setted as the output state by R0DD, and data is written in R0, data is outputted

into R0 pin. When set as the input state, input state of pin is read.

The initial value of R0 is unknown in reset state.

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