HMS87C1102 datasheet(44/88 Pages) HYNIX

44 / 88 page

HMS87C130XA/120XA/110XA

Apr. 2001 ver1.0

12. TIMER / COUNTER

The HMS87C1X0XA 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 can be used either two 8-bit Timer/

Counter or the one 16-bit Timer/Counter by combining

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 0-to-1 (rising edge) transition at its correspond-

ing external input pin, EC0(Timer 0).

Note:

If changing the Timer value or starting again, it

should be stop the timer clock firstly, and then

set Timer register value.

Ex)

LDM

TM0,#00001100B

LDM

TDR,#7FH

LDM

TM0,#00010111B

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

in response external interrupt same with timer function.

When external interrupt edge input, the count register is

captured into capture data register CDRx.

Timer1 is shared with “PWM” function and “Compare

output” 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

TMx as shown in Figure 12-1 and Table 12-1.

Figure 12-1 Timer Mode Register (TM0, TM1)

Timer 0 Mode Register

TM0

ADDRESS : D0H

RESET VALUE : --000000

CAP0

T0CK2

T0CK1

T0CK0

T0CN

T0ST

Timer 1 Mode Register

TM1

ADDRESS : D2H

RESET VALUE : 00000000

POL

16BIT

PWM0E

CAP1

T1CK1

T1CK0

T1CN

T1ST

CAP0

Capture mode selection bit.

0 : Disables Capture

1 : Enables Capture

T0CN

Continue control bit

0 : Stop counting

1 : Start counting continuously

T0CK[2:0]

Input clock selection

000 : fXIN

÷ 2, 100 : f

XIN

÷ 128

001 : fXIN

÷ 4, 101 : f

XIN

÷ 512

010 : fXIN

÷ 8, 110 : f

XIN

÷ 2048

011 : fXIN

÷ 32, 111 : External Event ( EC0 )

T0ST

Start control bit

0 : Stop counting

1 : Start counting

POL

PWM Output Polarity

0 : Duty active low

1 : Duty active high

T1CK[2:0]

Input clock selection

00 : fXIN

10 : fXIN

÷ 8

01 : fXIN

÷ 2 11 : using the Timer 0 clock

16BIT

16-bit mode selection

0 : 8-bit mode

1 : 16-bit mode

T1CN

Continue control bit

0 : Stop counting

1 : Start counting continuously

PWM0E

PWM enable bit

0 : Disables PWM

1 : Enables PWM

T1ST

Start control bit

0 : Stop counting

1 : Start counting

CAP1

Capture mode selection bit.

0 : Disables Capture

1 : Enables Capture

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