GMS81508B datasheet(46/100 Pages) HYNIX

46 / 100 page

HYUNDAI MicroElectronics

GMS81508B/16B/24B

DEC. 1999 Ver 1.04

11.3 8-bit Capture Mode

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

mode register TM0 (bit CAP2 of timer mode register TM2

for Timer 2) as shown in Figure 21. In this mode, Timer 1

still operates as an 8-bit timer/counter.

As mentioned above, not only Timer 0 but Timer 2 can also

be used as a capture mode.

In 8-bit capture mode, Timer 1 and Timer 3 are can not be

used as a capture mode.

The Timer/Counter register is incremented in response in-

ternal or external input. This counting function is same

with normal timer mode, but Timer interrupt is not gener-

ated. Timer/Counter still does the above, but with the add-

ed feature that a edge transition at external input INTn pin

causes the current value in the Timer counter register

(T0,T2), to be captured into registers CDRn (CDR0,

CDR2), respectively. After captured, Timer counter regis-

ter is cleared and restarts by hardware.

Note: The CDRn and TDRn are in same address.In the

capture mode, reading operation is read the CDRn, not

TDRn because path is opened to the CDRn.

It has three transition modes: "falling edge", "rising edge",

"both edge" which are selected by interrupt edge selection

61. In addition, the transition at INTn pin generate an inter-

rupt.

Figure 11-9 8-bit Capture Mode

EC0 PIN

÷ 4

÷ 16

÷ 64

XIN PIN

MUX

INT0IF

0: Stop

1: Clear and start

T0ST

T0SL[1:0]

“00”

“01”

“10”

“11”

INT0

INTERRUPT

T0CN

CDR0 (8-bit)

T0 (8-bit)

TIMER 0

BTCL

654

321

T1ST

CAP0

T0SL1

INITIAL VALUE: 00H

ADDRESS: 0E2H

TM0

T0SL0

T0CN

T0ST

T1SL1 T1SL0

X means don’t care

01 or 10 or 11

“01”

“10”

“11”

INT0 PIN

Capture

To TIMER1

IEDS[1:0]

Edge Detector

This figure is a example of using the Timer0.

In the Timer2, operation is same like Timer0, each registers and

flags may be changed with for Timer2.

GMS81508B Datasheet(PDF) 46 Page - Hynix Semiconductor

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