GMS81C5108 Datasheet, PDF(36/102 Page) Hynix Semiconductor – HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS

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GMS81C5108 Datasheet, PDF (36/102 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS

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GMS81C5108

Port R1 is multiplexed with various special features.The

control registers controls the selection of alternate func-

tion. After reset, this value is â0â, port may be used as nor-

mal I/O port. The way to select alternate function such as

comparator input or buzzer will be shown in each periph-

eral section.

In addition, R1 port is used as key scan function which op-

erate with normal input port.

Input or output is configured automatically by each func-

tion register (KSMR) regardless of R1DR.

R2 Port

R2 is a 4-bit CMOS bidirectional I/O port (address 0C2H).

Each I/O pin can independently used as an input or an out-

put through the R2DR register (address 0CAH).

R2 has internal pull-ups that is independently connected or

disconnected by R2PU (address 0D2H). The control regis-

ters for R2 are shown as below.

R2 Data Register

ADDRESS: 0C2H

RESET VALUE: ----0000B

- R23 R22 R21 R20

R2 Direction Register

R2DR

ADDRESS : 0CAH

RESET VALUE : ----0000B

R2 Pull-up

Selection Register

R2PU

Port Direction

0: Input

1: Output

ADDRESS : 0D2H

RESET VALUE : ----0000B

R2 Open Drain

Selection Register

R2CR

Pull-up select

0: Without pull-up

1: With pull-up

ADDRESS : 0D6H

RESET VALUE : ----0000B

Pull-up select

0: No Open Drain

1: Open Drain

R3 Port

R3 is a 4-bit CMOS bidirectional I/O port (address 0C3H).

Each I/O pin can independently used as an input or an out-

put through the R3DR register (address 0CBH).

R3 Data Register

ADDRESS: 0C3H

RESET VALUE: ----0000B

- R33 R32 R31 R30

R3 Direction Register

R3DR

ADDRESS : 0CBH

RESET VALUE : ----0000B

R3 Pull-up

Selection Register

R3PU

Port Direction

0: Input

1: Output

ADDRESS : 0D3H

RESET VALUE : ----0000B

R3 Open Drain

Selection Register

R3CR

Pull-up select

0: Without pull-up

1: With pull-up

ADDRESS : 0D7H

RESET VALUE : ----0000B

Pull-up select

0: No Open Drain

1: Open Drain

SEG0~SEG36

Segment signal output pins for the LCD display. See "19.

LCD DRIVER" on page 71 for details.

COM0~COM3

Common signal output pins for the LCD display. See "19.

LCD DRIVER" on page 71 for details.

SEG34~SEG36 and COM1~COM3 are selected by LCDD

of the LCR register.

JUNE 2001 Ver 1.0

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