GMS82512 datasheet(38/110 Pages) HYNIX

38 / 110 page

GMS81508B/16B/24B, GMS82512/16/24

MAY. 2001 Ver 2.0

R3 and R3DD register: R3 is an 8-bit CMOS bidirection-

al I/O port (address 0C6H). Each I/O pin can independently

used as an input or an output through the R3DD register

(address 0C7H).

R4 and R4DD register: R4 is an 8-bit CMOS bidirection-

al I/O port (address 0C8H). Each I/O pin can independently

used as an input or an output through the R4DD register

(address 0C9H).

In addition, Port R4 is multiplexed with various special

features. The control register PMR4 (address 0D0H) con-

trols the selection of alternate function. After reset, this

value is “0”, port may be used as normal I/O port.

To use alternate function such as external interrupt, exter-

nal counter input or timer clock out, write “1” in the corre-

sponding bit of PMR4.

R45~R47 are NOT served on GMS825xx.

Regardless of the direction register R4DD, PMR4 is select-

ed to use as alternate functions, port pin can be used as a

corresponding alternate features.

Port Pin

Alternate Function

R40

R41

R42

R43

R44

R45

R46

R47

INT0 (External Interrupt 0)

INT1 (External Interrupt 1)

INT2 (External Interrupt 2)

INT3 (External Interrupt 3)

EC0 (External count input to Timer/

Counter 0)

EC2 (External count input to Timer/

Counter 2)

T1O (Timer 1 Clock-out)

T3O (Timer 3 Clock-out)

R3 Data Register

ADDRESS: 0C6H

RESET VALUE: Undefined

R37 R36 R35 R34 R33 R32 R31 R30

Port Direction

R3 Direction Register

R3DD

ADDRESS: 0C7H

RESET VALUE: 00H

0: Input

1: Output

Input / Output data

R4 Port Mode Register

PMR4

ADDRESS: 0D0H

RESET VALUE: 00H

0: R40

1: INT0

0: R41

1: INT1

0: R42

1: INT2

0: R43

1: INT3

0: R44

1: EC0

0: R45

1: EC2

0: R46

1: T1O

0: R47

1: T3O

Edge Selection Register

IEDS

ADDRESS: 0F8H

RESET VALUE: 00H

INT0

INT1

INT2

INT3

External Interrupt Edge Select

00: Reserved

01: Falling (1-to-0 transition)

10: Rising (0-to-1 transition)

11: Both (Rising & Falling)

R4 Data Register

ADDRESS: 0C8H

RESET VALUE: Undefined

R47 R46 R45 R44 R43 R42 R41 R40

Port Direction

R4 Direction Register

R4DD

ADDRESS: 0C9H

RESET VALUE: 00H

0: Input

1: Output

Input / Output data

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