GMS81604 View Datasheet(PDF) - Hyundai Micro Electronics

Part Name

Description

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GMS81604

LG Semicon. CMOS single-chip 8-bit microcontroller. ROM size 8K bytes. 256 bytes of on-chip data RAM

Hyundai Micro Electronics 

LG Semicon

GMS81604/08

16-bit Timer/Counter Mode

The Timer register is being run with all 16 bits. A 16-bit

timer/counter register T0, T1 are incremented from

0000H until it matches TDR0, TDR1 and then resets

to 0000H. The match output generates Timer 0 inter-

rupt.

The clock source of the Timer 0 is selected either

internal or external clock by bit T0SL1, T0SL0.

Even if the Timer 0 (including the Timer 1) is used as

a 16-bit timer, the Timer 2 and Timer 3 can still be used

as either two 8-bit timer or one 16-bit timer by setting

the TM2. Reversely, even if the Timer 2 (including the

Timer 3) is used as a 16-bit timer, the Timer 0 and

Timer 1 can still be used as 8-bit timer independently.

MSB

LSB

TM0 CAP0 T1ST T1SL1 T1SL0 T0ST T0CN T0SL1 T0SL0

0

T0SL[1:0]

EDGE DETECTOR

EC0 PIN

XIN PIN

÷4

÷ 16

÷ 64

MUX

X

0

0

DO NOT CARE

0

1

T0CN

X

X

X

X

T0ST

0: Stop

1: Clear and Start

T1

T0

(8-BITS) (8-BITS)

CLEAR

PRESCALER

TIMER 0 (+TIMER1)

COMPARATOR

THIS FIGURE IS A EXAMPLE OF THE TIMER 0 AND

TIMER 1.

IN THE TIMER 2, EACH REGISTERS AND FLAGS MAY BE

CHANGED CORRESPONDINGLY.

TDR1

(8-BITS)

HIGHER

TDR0

(8-BITS)

LOWER

ADDRESS: E2H

RESET VALUE: 00H

T0IF

TIMER 0

INTERRUPT

(NOT TIMER 1 INTERRUPT)

Figure 19. 16-bit Timer/Counter Mode

TDR0

MATCH

Stop

Stop

Restart

Clear and Start

MATCH

Count Up

00H

TIMER

INTERRUPT

CLEAR

CLEAR

OCCUR INTERRUPT

TxST

HIGH

LOW

HIGH

TxCN LOW

CLEAR

TIME

OCCUR INTERRUPT

Figure 20. Timer Count Operation

31

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