HMS87C1302AD datasheet(39/70 Pages) HYNIX

39 / 70 page

HYUNDAI MicroElectronics

HMS87C1304A/HMS87C1302A

Jan. 2001

Preliminary

12.2 16-bit Timer/Counter Mode

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

counter register T0, T1 are increased from 0000H until it

matches TDR0, TDR1 and then resets to 0000H. The

match output generates Timer 0 interrupt not Timer 1 in-

terrupt.

The clock source of the Timer 0 is selected either internal

or external clock by bit T0CK2, T0CK1 and T0SL0.

In 16-bit mode, the bits T1CK1,T1CK0 and 16BIT of TM1

should be set to “1” respectively.

Figure 12-5 16-bit Timer / Counter Mode

12.3 8-bit Compare Output (16-bit)

The HMS87C1304A and HMS87C1302A has a function

of Timer Compare Output. To pulse out, the timer match

can goes to port pin(COMP0) as shown in Figure 12-2 and

Figure 12-5 . Thus, pulse out is generated by the timer

match. These operation is implemented to pin, RB4/

COMP0/PWM.

This pin output the signal having a 50: 50 duty square

wave, and output frequency is same as below equation.

In this mode, the bit PWMO of RB function register (RB-

FUNC) should be set to “1”, and the bit PWME of timer1

mode register (TM1) should be set to “0”.

In addition, 16-bit Compare output mode is available, also.

12.4 8-bit Capture Mode

The Timer 0 capture mode is set by bit CAP0 of timer

mode register TM0 (bit CAP1 of timer mode register TM1

for Timer 1) as shown in Figure 12-6 .

As mentioned above, not only Timer 0 but Timer 1 can also

be used as a capture mode.

The Timer/Counter register is increased in response inter-

nal or external input. This counting function is same with

normal timer mode, and Timer interrupt is generated when

TM0

ADDRESS : D0H

RESET VALUE : --000000

CAP0

T0CK2

T0CK1

T0CK0

T0CN

T0ST

TM1

ADDRESS : D2H

RESET VALUE : 00000000

POL

16BIT

PWME

CAP1

T1CK1

T1CK0

T1CN

T1ST

XXXXX

10011

÷ 2

÷ 4

÷ 128

÷ 512

÷ 8

÷ 32

fxin

EC0

Edge Detector

MUX

T1 (8-bit)

TDR1 (8-bit)

T0IF

CLEAR

COMPARATOR

TIMER 0

INTERRUPT

T0 (8-bit)

TDR0 (8-bit)

T0ST

0 : Stop

1 : Start

T0CN

T0CK[2:0]

F/F

COMP0 PIN

÷ 2048

X: The value “0” or “1” corresponding your operation.

)

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Preliminary

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