GMS8160XPL datasheet(27/79 Pages) HYNIX

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I/O PORTS

The GMS81604/08 have five ports, R0, R1, R4, R5,

R6. These ports pins may be multiplexed with an

alternate function for the peripheral features on the

device. In general, when a initial reset state, all ports

are used as a general purpose input port.

All pins have data direction registers which can con-

figure these pins as output or input.

A "1" in the port direction register configures the

corresponding port pin as output. Conversely, write

"0" to the corresponding bit to specify as an input pin.

For example, to use the even numbered bit of R1 as

output ports and the odd numbered bits as input ports,

write "55H" to address C1H (R0 direction register)

during initial setting as shown in Figure 10.

Reading data register reads the status of the pins

whereas writing to it will write to the port latch.

R0 and R0DD registers: R0 is a 8-bit bidirectional

I/O port (address C0H). Each pin is individually con-

figurable as input and output through the R0DD regis-

ter (address C1H).

R1 and R1DD registers: R1 is an 8-bit bidirectional

I/O port (address C2H). Each pin is individually con-

figurable as input and output through the R1DD regis-

ter (address C3H).

R4 and R4DD registers: R4 is an 8-bit bidirectional

I/O port (address C8H). Each pin is individually con-

figurable as input and output through the R4DD regis-

ter (address C9H).

In addition, Port R4 is multiplexed with various special

features. The control register PMR4 (address D0H)

controls to select alternate function. After reset, this

value is "0", port may be used as general I/O ports. To

select alternate function such as External interrupt or

External counter or Timer clock out, write "1" to the

corresponding bit of PMR4.

Port Pin

Alternate Function

R40

R41

R42

R43

INT0 (External Interrupt 0)

INT1 (External Interrupt 1)

INT2 (External Interrupt 2)

INT3 (External Interrupt 3)

R44

R45

EC0 (External Count Input to Timer/

Counter 0)

EC2 (External Count Input to Timer/

Counter 2)

R46

R47

T1O (Timer 1 Clock-Out)

T3O (Timer 3 Clock-Out)

Regardless of the direction register R4DD, PMR4 is

selected to use as alternate functions, port pin can be

used as a corresponding alternate features.

WRITE "55H" TO PORT R0 DIRECTION REGISTER

BIT

PORT

R0 DATA

R0 DIRECTION

R1 DATA

R1 DIRECTION

C0H

C1H

C2H

C3H

I: INPUT PORT

O: OUTPUT PORT

Figure 10. Example port I/O assignment

R07 R06 R05 R04 R03 R02 R01 R00

Port 0 Data Register

ADDRESS: C0H

RESET VALUE: Undefined

R07 R06 R05 R04 R03 R02 R01 R00

R0DD

ADDRESS: C1H

RESET VALUE: 00000000

Direction select

0: Input

1: Output

Input/ Output data

Port 0 Direction Register

R17 R16 R15 R14 R13 R12 R11 R10

Port 1 Data Register

ADDRESS: C2H

RESET VALUE: Undefined

R17 R16 R15 R14 R13 R12 R11 R10

R1DD

ADDRESS: C3H

RESET VALUE: 00000000

Direction select

0: Input

1: Output

Input/ Output data

Port 1 Direction Register

LG Semicon

GMS81604/08

GMS8160XPL Datasheet(PDF) 27 Page - Hynix Semiconductor

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