GMS81C2012 datasheet(48/107 Pages) HYNIX

48 / 107 page

GMS81C2012/GMS81C2020

HYUNDAI MicroElectronics

MAR. 2000 Ver 1.00

12. TIMER/EVENT COUNTER

The GMS81C20xx has two 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.

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 2 and

most clock consists of 2048 oscillator periods, the count

rate is 1/2 to 1/2048 of the oscillator frequency in Timer0.

And Timer1 can use the same clock source too. In addition,

Timer1 has more fast clock source (1/1 to 1/8).

In the “counter” function, the register is increased in re-

sponse to a 1-to-0 (falling edge) or 0-to-1(rising edge) tran-

sition at its corresponding external input pin, EC0.

In addition the “capture” function, the register is increased

in response external or internal clock sources same with

timer or counter function. When external clock edge input,

the count register is captured into capture data register

CDRx.

Timer1 is shared with "PWM" function and "Compare out-

put" function

It has seven operating modes: "8-bit timer/counter", "16-

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

compare output", "16-bit compare output" and "10-bit

PWM" which are selected by bit in Timer mode register

TM0 and TM1 as shown in Figure 12-1 and Table 12-1.

16BIT

CAP0

CAP1

PWM1E

T0CK

[2:0]

T1CK

[1:0]

PWM1O

TIMER 0

TIMER 1

XXX

8-bit Timer

111

8-bit Event counter

8-bit Capture

XXX

8-bit Capture (internal clock)

8-bit Compare Output

XXX

8-bit Timer/Counter

10-bit PWM

XXX

16-bit Timer

111

16-bit Event counter

XXX

16-bit Capture (internal clock)

XXX

16-bit Compare Output

Table 12-1 Operating Modes of Timer0 and Timer1

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