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HMS87C1304A

CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

Hyundai Micro Electronics 

HMS87C1304A/HMS87C1302A

HYUNDAI MicroElectronics

5. PIN FUNCTION

VDD: Supply voltage.

VSS: Circuit ground.

RESET: Reset the MCU.

XIN: Input to the inverting oscillator amplifier and input to

the internal main clock operating circuit.

RB0~RB7: RB is a 8-bit, CMOS, bidirectional I/O port.

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

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

RB serves the functions of the various following special

features in Table 5-2

XOUT: Output from the inverting oscillator amplifier.

Port pin

Alternate function

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 the their Port Direction Register(RAIO).

RB0

AN0 ( Analog Input Port 0 )

AVref ( External Analog Reference Pin )

RB1

BUZ ( Buzzer Driving Output Port )

RB2

INT0 ( External Interrupt Input Port 0 )

Port pin

Alternate function

RB3

INT1 ( External Interrupt Input Port 1 )

RB4

PWM0 (PWM0 Output)

RA0

EC0 ( Event Counter Input Source )

COMP0 (Timer1 Compare Output)

RA1

AN1 ( Analog Input Port 1 )

Table 5-2 RB Port

RA2

AN2 ( Analog Input Port 2 )

RA3

AN3 ( Analog Input Port 3 )

RA4

AN4 ( Analog Input Port 4 )

y RA5

AN5 ( Analog Input Port 5 )

r RA6

AN6 ( Analog Input Port 6 )

RA7

AN7 ( Analog Input Port 7 )

a Table 5-1 RA Port

in In addition, RA serves the functions of the various special

Prelim features in Table 5-1 .

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 the their Port Direction Register(RCIO).

RD0~RD3: RD is a 4-bit, CMOS, bidirectional I/O port.

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

or “0” written the their Port Direction Register(RDIO).

6

Preliminary

Jan. 2001

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