GMS81C1102 Datasheet, PDF(42/89 Page) Hynix Semiconductor

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GMS81C1102 Datasheet, PDF (42/89 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

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GMS81C1102 / GMS81C1202

13.2 RB and RBIO registers

RB is a 5-bit bidirectional I/O port (address C2H). Each

pin can be set individually as input and output through the

RBIO register (address C3H).

RB Data Register

ADDRESS : C2H

RESET VALUE : Undefined

RB4 RB3 R B2 RB1 RB0

Pull-up Selection Register

PUPSEL

ADDRESS : CCH

RESET VALUE : ------00

PUP1 PUP0

INPUT / OUTPUT DATA

RB Direction Register

RBIO

ADDRESS : C3H

RESET VALUE : ---00000

- RB4 RB3 RB2 RB1 RB0

RB3 / INT1 Pull-up

0 : No Pull-up

1 : With Pull-up

RB2 / INT0 Pull-up

0 : No Pull-up

1 : With Pull-up

Interrupt Edge Selection Register

IEDS

ADDRESS : E6H

RESET VALUE : ----0000

DIRECTION SELECT

0 : INPUT PORT

1 : OUTPUT PORT

RB Function Selection Register

RBFUNC

ADDRESS : CBH

RESET VALUE : ---00000

PWMO INT1I INT0I BUZO AVREFS

IED1H IED1L IED0H IED0L

INT1

INT0

External Interrupt Edge Select

00 : Normal I/O port

01 : Falling ( 1-to-0 transition )

10 : Rising ( 0-to-1 transition )

11 : Both ( Rising & Falling )

0 : RB4

1 : PWM0 Output or

Compare Output

0 : RB3 0 : RB2

1 : INT1 1 : INT0

0 : RB0 when ANSEL0 = 0, AN0 when ANSEL0 = 1

1 : AVref

0 : RB1

1 : BUZ Output

The shaded areas are only related with in GMS81C1202.

So in GMS81C1102, this area must be written to â0â.

Figure 13-3 Registers of Port RB

In addition, Port RB is multiplexed with various special

features. The control register RBFUNC (address CBH)

controls to select alternate function. After reset, this value

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

ternate function such as External interrupt or Timer com-

pare output, write "1" to the corresponding bit of

RBFUNC.

Regardless of the direction register RBIO, RBFUNC is se-

lected to use as alternate functions, port pin can be used as

a corresponding alternate features.

PORT RBFUNC.4~0

Description

RB4/

PWM0/

COMP0

RB4 ( Normal I/O Port )

PWM0 Output /

Timer1 Compare Output

RB3/INT1

RB3 ( Normal I/O Port )

External Interrupt Input 1

RB2/INT0

RB2 ( Normal I/O Port )

External Interrupt Input 0

RB1/BUZ

RB1 ( Normal I/O Port )

Buzzer Output

RB0/AN0/

AVref

RB0 ( Normal I/O Port ) /

AN0 (ANSEL0=1)

External Analog Reference

Voltage

1. When ANSEL0 = "0", this port is defined for normal I/O port

( RB0 ).

When ANSEL0 = "1" and ADS2~0 = " 000", this port

can be used Analog Input Port ( AN0 ).

2. When this bit set to "1", this port defined for AVref , so it can

not be used Analog Input Port AN0 and Normal I/O

Port RB0.

Jan. 2002 ver 2.0

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