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GMS81C3004

CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER WITH LCD DRIVER

Hyundai Micro Electronics 

GMS81C3004

5. PIN FUNCTION

VDD: Supply voltage.

VSS: Circuit ground.

TEST: Used for shipping inspection of the IC. For normal

operation, it should be connected to VSS.

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.

SXIN: Input to the internal sub system clock operating cir-

cuit.

SXOUT: Output from the inverting subsystem 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.

In addition, R0 serves the functions of the various follow-

ing special features.

Port pin

R00

R01

R02

R03

R06

Alternate function

INT0 (External interrupt 0)

INT1 (External interrupt 1)

INT2 (External interrupt 2)

Event counter input

LCD clock output

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.

In addition, R1 serves the functions of the various follow-

ing special features.

Port pin

Alternate function

R10 KS0 (Key scan input 0)

R11 KS1 (Key scan input 1)

R12 KS2 (Key scan input 2)

R13 BUZ / KS3 (Buzzer output or Key scan input

3)

R14 CMP0 / KS4 (Comparator input or Key scan

input 4)

R15 CMP1 / KS5 (Comparator input or Key scan

input 5)

R16 CMP2 / KS6 (Comparator input or Key scan

input 6)

R17 CMP3 / KS7 (Comparator input or Key scan

input 7)

R20~R22: R2 is a 3-bit CMOS bidirectional I/O port. Each

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

be used as outputs or inputs.

R40~R47, R50~57, R60~R67, R70~R77:

R4, R5, R6, R7 are four 8-bit CMOS bidirectional I/O port.

Each pins 1 or 0 written to the their Port Direction Register

can be used as outputs or inputs.

Ports is multiplexed with SEG0~SEG31 respectively.

Port pin

SEG0~SEG7

SEG8~SEG15

SEG16~SEG23

SEG24~SEG31

Alternate function

R40~R47

R50~R57

R60~R67

R70~R77

After the reset of the MCU, port is initialized as a segment

output port.

SEG0~SEG39: Segment signal output pins for the LCD

display. See "15. LCD DRIVER" on page 55 for details.

COM0~COM7: Common signal output pins for the LCD

display. See "15. LCD DRIVER" on page 55 for details.

VCL1~VCL5: Power supply pins for the LCD driver. Since

the LCD driving resistors are provided internally, no lines

should be connected to these pins. The voltage on each pin

is VDD> VCL1> VCL2> VCL3> VCL4> VCL5> VSS. For de-

tails, Refer to Section "15.".

MAR. 1999 Ver 1.01

5

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