GMS81604 View Datasheet(PDF) - Hyundai Micro Electronics

Part Name

Description

View to exact match

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

TIMER/COUNTER

The GMS81604 has four Timer/Counter registers.

Each module can generate an interrupt to indicate that

an event has occurred (i.e. timer match).

Timer 0 and Timer 1 are can be used either the two

8-bit Timer/Counter or one 16-bit Timer/Counter to

combine them. Also Timer 2 and Timer 3 are same.

In the "timer" function, the register is incremented

every internal clock input. Thus, one can think of it as

counting internal clock input. Since a least clock con-

sists of 4 and most clock consists of 64 oscillator

periods, the count rate is 1/4 to 1/64 of the oscillator

frequency.

In the "counter" function, the register is incremented

in response to a 1-to-0 (falling edge) transition at its

corresponding external input pin, EC0 or EC2.

In addition the "capture" function, the register is incre-

mented in response external or internal clock sources

same with timer or counter function. When external

clock edge input, the count register is captured into

Timer data register correspondingly.

It has four operating modes: "8-bit timer/counter",

"16-bit timer/counter", "8-bit capture", "16-bit cap-

ture" which are selected by bit in Timer mode register

TM0 and TM2 as shown in right Table.

In operation of Timer 2, Timer 3, their operations are

same with Timer 0, Timer 1, respectively.

TM0 FOR TIMER 0, TIMER 1

CAP0 T1SL1 T 1 S L 0

Timer 0

Timer 1

0

0

0

16-bit Timer/Counter

1

0

0

16-bit Capture

0

X

X 8-bit Timer

8-bit Timer

1

X

X 8-bit Capture 8-bit Timer

TM2 FOR TIMER 2, TIMER 3

CAP2 T 3 S L 1 T 3 S L 0

Timer 2

Timer 3

0

0

0

16-bit Timer/Counter

1

0

0

16-bit Capture

0

X

X 8-bit Timer

8-bit Timer

1

X

X 8-bit Capture 8-bit Timer

TM0

TM2 is in Figure 14.

MSB

LSB

CAP0 T1ST T1SL1 T1SL0 T0ST T0CN T0SL1 T0SL0

TIMER 1

TIMER 0

ADDRESS: E2H

RESET VALUE: 00H

CAP0 Capture mode selection flag, When set, timer

operate as one 16-bit capture timer combine

two 8-bit timers.

T0ST

When set, The Timer 0 Count Register is

cleared and start again.

When cleared, stop the counting.

T1ST

When set, Timer 1 count register is cleared

and start again.

When cleared, stop the counting.

TIMER 1

T1SL1 T1SL0 INPUT CLOCK

0

0 16-BIT TIMER MODE (NOTE 1)

0

1 8-BIT TIMER, ÷ 4 ← PRESCALER

1

0 8-BIT TIMER, ÷ 16

1

1 8-BIT TIMER, ÷ 64

T0CN Start/Stop control for Timer 0. A logic 1

starts the timer.

TIMER 0

T0SL1 T0SL0 INPUT CLOCK

0

0 Timer or Counter select

0

1 ÷ 4 ← PRESCALER

1

0 ÷ 16

1

1 ÷ 64

NOTE:

If this mode selected, the Timer 0 are used as a 16-bit timer mode. The Timer 1 is engaged to the Timer 0.

The source clock is selected by bits T0SL1 and T0SL0.

Figure 13. TM0: Timer 0, Timer 1 Mode Register

27

Share Link: