GMS87C1102 datasheet(6/80 Pages) HYNIX

6 / 80 page

GMS87C1102 / GMS87C1202

HYUNDAI MicroElectronics

Oct. 1999 ver 1.0

8. PIN FUNCTION

VDD: Supply voltage.

VSS: Circuit ground.

RESET: Reset the MCU.

XIN: Input to the inverting oscillator amplifier and input to

the internal clock operating circuit.

XOUT: Output from the inverting oscillator amplifier. If

RC Option is used, the oscillator frequency divided by 4

(Xin/4) comes out from Xout pin.

RA0~RA7: RA is an 8-bit, CMOS, bidirectional I/O port.

RA pins can be used as outputs or inputs according to “1”

or “0” written in the Port Direction Register(RAIO).

In addition, RA serves the functions of the various special

features in Table 8-1.

RB0~RB4: RB is a 5-bit, CMOS, bidirectional I/O port.

RB pins can be used as outputs or inputs according to “1”

or “0” written in the Port Direction Register(RBIO).

RB serves the functions of the various following special

features.

RC0~RC1: RC is a 2-bit, CMOS, bidirectional I/O port.

RC pins can be used as outputs or inputs according to “1”

or “0” written in the Port Direction Register(RCIO)

Port pin

Alternate function

RA0

RA1

RA2

RA3

RA4

RA5

RA6

RA7

EC0 ( Event Counter Input Source )

AN1 ( Analog Input Port 1 )

AN2 ( Analog Input Port 2 )

AN3 ( Analog Input Port 3 )

AN4 ( Analog Input Port 4 )

AN5 ( Analog Input Port 5 )

AN6 ( Analog Input Port 6 )

AN7 ( Analog Input Port 7 )

Table 8-1 RA Port

Port pin

Alternate function

RB0

RB1

RB2

RB3

RB4

AN0 ( Analog Input Port 0 )

AVref ( External Analog Reference Pin )

BUZ ( Buzzer Driving Output Port )

INT0 ( External Interrupt Input Port 0 )

INT1 ( External Interrupt Input Port 1 )

PWM ( PWM Output )

COMP0 ( Timer0 Compare Output )

Table 8-2 RB Port

PIN NAME

Pin No.

In/Out

Function

VDD

Supply voltage

VSS

Circuit ground

RESET

Reset signal input

XIN

XOUT

RA0 (EC0)

I/O (Input)

8-bit general I/O ports

External Event Counter input

RA1 (AN1)

I/O (Input)

Analog Input Port 1

RA2 (AN2)

I/O (Input)

Analog Input Port 2

RA3 (AN3)

I/O (Input)

Analog Input Port 3

RA4 (AN4)

I/O (Input)

Analog Input Port 4

RA5 (AN1)

I/O (Input)

Analog Input Port 5

RA6 (AN1)

I/O (Input)

Analog Input Port 6

RA7 (AN7)

I/O (Input)

Analog Input Port 7

RB0 (AVref/AN0)

I/O (Input)

5-bit general I/O ports

Analog Input Port 0 / Analog Reference

RB1 (INT0)

I/O (Input)

External Interrupt Input 0

RB2 (INT1)

I/O (Input)

External Interrupt Input 1

RB3 (BUZ)

I/O (Output)

Buzzer Driving Output

RB4 (PWM/COMP0)

I/O (Output/Output)

PWM Output or Timer Compare Output

RC0

I/O

2-bit general I/O ports

RC1

I/O

Table 8-3 Pin Description

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