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GMS81C7008

8-BIT SINGLE-CHIP MICROCONTROLLERS

Hynix Semiconductor 

GMS81C7008/7016

5. PIN FUNCTION

VDD: Supply voltage.

VSS: Circuit ground.

RESET: Reset the MCU.

AVDD: Supply voltage to the ladder resistor of ADC circuit. To

enhance the resolution of analog to digital converter, use inde-

pendent power source as well as possible, other than digital pow-

er source.

AVSS: ADC circuit ground.

XIN: Input to the inverting oscillator amplifier and input to the in-

ternal main clock operating circuit.

XOUT: Output from the inverting oscillator amplifier.

BIAS: LCD bias voltage input pin.

VCL0~VCL2: LCD driver power supply pins. The voltage on

each pin is VCL2> VCL1> VCL0. For details, Refer to “18. LCD

DRIVER” on page 70.

COM0~COM3: LCD common signal output pins. Also, the pins

of COM1,COM2 and COM3 are shared with LCD segment sig-

nal outputs of SEG26, SEG25, SEG24 as application require-

ment.

SXIN: Input to the internal subsystem clock operating circuit. In

addition, SXIN is shared with the R36 which is selected by the

software option.

SXOUT: Output from the inverting subsystem oscillator amplifi-

er. In addition, SXOUT is shared with the R35 which is selected

by the software option.

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 schmitt trigger inputs. Also, pull-up resistors and open-drain

outputs are software assignable.

In addition, R0 serves the functions of the various following spe-

cial features.

Port pin

R00

R01

R02

R03

R04

R05

R06

R07

Alternate function

INT0 (External interrupt 0)

INT1 (External interrupt 1)

INT2 (External interrupt 2)

EC0 (Event counter input 0)

EC2 (Event counter input 2)

SCK (Serial clock)

SO (Serial data output)

SI (Serial data input)

R10~R11: R1 is a 2-bit CMOS bidirectional I/O port. R1 pins 1

or 0 written to the Port Direction Register can be used as outputs

or inputs. Also, pull-up resistors and open-drain outputs are soft-

ware assignable. These pins are not served on 81C71XX.

In addition, R0 serves the functions of the various following spe-

cial features.

Port pin

R00

R01

Alternate function

KS0 (Key scan 0)

KS1 (Key scan 1)

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. Also, pull-up resistors and open-drain outputs are soft-

ware assignable.R24~R27 are not served on 81C71XX.

In addition, R2 is shared with the ADC input.

Port pin

R20

R21

R22

R23

R24

R25

R26

R27

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)

R30~R36: R3 is a 7-bit CMOS bidirectional I/O port. R3 pins 1

or 0 written to the Port Direction Register can be used as outputs

or inputs. Also, pull-up resistors and open-drain outputs are soft-

ware assignable. R33, R34 are not served on 81C71XX.

In addition, R3 serves the functions of the various follow-

ing special features.

Port pin

R30

R31

R32

R33

R34

R35

R36

Alternate function

BUZ (Buzzer driving output)

PWM0 / T1O (PWM 0 output

/ Timer 1 output)

PWM1 /T3O (PWM 1 output

/ Timer 3 output)

-

WDTO (Watchdog timer output)

SXOUT (Sub clock output)

SXIN (Sub clock input)

SEG0~SEG7: These pins generate LCD segment signal output.

Every LCD segment pins are shared with normal R4 input/output

port. 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 in-

6

APR., 2001 Ver 2.01

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