GMS81508B datasheet(39/100 Pages) HYNIX

39 / 100 page

GMS81508B/16B/24B

HYUNDAI MicroElectronics

DEC. 1999 Ver 1.04

11. TIMER/EVENT COUNTER

The GMS815xxB 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 two 8-bit Tim-

er/Counter or one 16-bit Timer/Counter with combine

them. Also Timer 2 and Timer 3 are same.

In the “timer” function, the register is increased every in-

ternal clock input. Thus, one can think of it as counting in-

ternal clock input. Since a least clock consists 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 re-

sponse to a 1-to-0 (falling edge) transition at its corre-

sponding 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 capture” which are

selected by bit in Timer mode register TM0 and TM2 as

shown in Table 11-1.

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

with Timer 0, Timer 1, respectively as shown in Table 11-

TM0

TIMER 0

TIMER 1

CAP

T1ST

T1SL

[1:0]

T0ST

T0CN

T0SL[1:0]

01 or

10 or

01 or 10 or 11

8-bit Timer

8-bit Event counter

8-bit Timer

01 or 10 or 11

8-bit Capture (internal clock)

8-bit Timer

8-bit Capture (external clock)

8-bit Timer

01 or 10 or 11

16-bit Timer

16-bit Event counter

01 or 10 or 11

16-bit Capture (internal clock)

16-bit Capture (external clock)

Table 11-1 TM0 Timer Mode Register

TM2

TIMER 2

TIMER 3

CAP

T3ST

T3SL

[1:0]

T2ST

T2CN

T2SL[1:0]

01 or

10 or

01 or 10 or 11

8-bit Timer

8-bit Event counter

8-bit Timer

01 or 10 or 11

8-bit Capture (internal clock)

8-bit Timer

8-bit Capture (external clock)

8-bit Timer

01 or 10 or 11

16-bit Timer

16-bit Event counter

01 or 10 or 11

16-bit Capture (internal clock)

16-bit Capture (external clock)

Table 11-2 TM2 Timer Mode Register

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