GMS81508B 데이터 시트보기 (PDF) - Hyundai Micro Electronics

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GMS81508B

CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH A/D CONVERTER

Hyundai Micro Electronics 

GMS81508B/16B/24B

HYUNDAI MicroElectronics

5. PIN FUNCTION

VDD: Supply voltage.

VSS: Circuit ground.

TEST: Used for Test Mode. For normal operation, it

should be connected to VDD.

RESET: Reset the MCU.

XIN: Input to the inverting oscillator amplifier and input to

the internal main clock operating circuit.

XOUT: Output from the inverting oscillator amplifier.

R00~R07: R0 is an 8-bit CMOS bidirectional I/O port. R0

pins 1 or 0 written to the Port Direction Register can be

used as outputs or inputs.

R10~R17: R1 is an 8-bit CMOS bidirectional I/O port. R1

pins 1 or 0 written to the Port Direction Register can be

used as outputs or inputs.

R20~R27: R2 is an 8-bit CMOS bidirectional I/O port. R2

pins 1 or 0 written to the Port Direction Register can be

used as outputs or inputs.

R30~R37: R3 is an 8-bit CMOS bidirectional I/O port. R3

pins 1 or 0 written to the Port Direction Register can be

used as outputs or inputs.

R40~R47: R4 is an 8-bit CMOS bidirectional I/O port. R4

pins 1 or 0 written to the Port Direction Register can be

used as outputs or inputs.

In addition, R4 serves the functions of the various follow-

ing special features.

Port pin

R40

R41

R42

R43

R44

R45

R46

R47

Alternate function

INT0 (External interrupt 0)

INT1 (External interrupt 1)

INT2 (External interrupt 2)

INT3 (External interrupt 3)

EC0 (Event counter input 0)

EC2 (Event counter input 2)

T1O (Timer/Counter 1 output)

T3O (Timer/Counter 3 output)

R50~R57: R5 is an 8-bit CMOS bidirectional I/O port. R5

pins 1 or 0 written to the Port Direction Register can be

used as outputs or inputs.

In addition, R5 serves the functions of the various follow-

ing special features.

Port pin

R50

R51

R52

R53

R54

R55

R56

R57

Alternate function

SIN (Serial data input)

SOUT (Serial data output)

SCLK (Serial clock)

SRDY (Serial ready)

WDTO (Watchdog Timer output)

BUZ (Buzzer driver output)

PWM0 (PWM output 0)

PWM1 (PWM output 1)

R60~R67: R6 is an 8-bit CMOS bidirectional I/O port. R6

pins 1 or 0 written to the Port Direction Register can be

used as outputs or inputs.

In addition, R6 is shared with the ADC input.

Port pin

R60

R61

R62

R63

R64

R66

R66

R67

Alternate function

AN0 (Analog Input 0)

AN1 (Analog Input 1)

AN2 (Analog Input 2)

AN3 (Analog Input 3)

AN4 (Analog Input 4)

AN5 (Analog Input 5)

AN6 (Analog Input 6)

AN7 (Analog Input 7)

Note: On the MDS Choice, when the MCU is RESET, R60

can not be used digital input port. For more detail, refer to

"9. I/O PORTS" on page 31.

AVDD: Supply voltage to the ladder resistor of ADC cir-

cuit. To enhance the resolution of analog to digital convert-

er, use independent power source as well as possible, other

than digital power source.

AVSS: ADC circuit ground.

8

DEC. 1999 Ver 1.04

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