GMS87C1102 datasheet(35/80 Pages) HYNIX

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HYUNDAI MicroElectronics

GMS87C1102 / GMS87C1202

Oct. 1999 ver 1.0

12.2 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).

Figure 12-3 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.

RB4 RB3 RB 2

RB1 RB0

INPUT / OUTPUT DATA

RB Data Register

ADDRESS : C2H

RESET VALUE : Undefined

AVREFS

RB Function Selection Register

RBFUNC

ADDRESS : CBH

RESET VALUE : ---00000

BUZO

INT0I

INT1I

PWMO

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

0 : RB1

1 : BUZ Output

0 : RB4

1 : PWM0 Output or

0 : RB2

1 : INT0

0 : RB3

1 : INT1

PUP0

Pull-up Selection Register

PUPSEL

ADDRESS : CCH

RESET VALUE : ------00

PUP1

0 : No Pull-up

1 : With Pull-up

0 : No Pull-up

1 : With Pull-up

IED0L

Interrupt Edge Selection Register

IEDS

ADDRESS : E6H

RESET VALUE : ----0000

IED0H

IED1L

IED1H

External Interrupt Edge Select

INT0

INT1

00 : Normal I/O port

01 : Falling ( 1-to-0 transition )

10 : Rising ( 0-to-1 transition )

11 : Both ( Rising & Falling )

Compare Output

RB2 / INT0 Pull-up

RB3 / INT1 Pull-up

1 : AVref

0 : INPUT PORT

1 : OUTPUT PORT

DIRECTION SELECT

RB4 RB3 RB2 RB1 RB0

RB Direction Register

RBIO

ADDRESS : C3H

RESET VALUE : ---00000

The shaded areas are only related with in GMS87C1202/1201.

So in GMS87C1102/1101, this area must be written to “0”.

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.

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