GMS82524TK datasheet(41/93 Pages) HYNIX

41 / 93 page

GMS82512/16/24

HYUNDAI MicroElectronics

FEB. 2000 Ver 1.00

8-bit Event Counter Mode

In this mode, counting up is started by an external trigger.

This trigger means falling edge of the EC0 pin input.

Source clock is used as an internal clock selected with tim-

er mode register TM0. The contents of timer data register

TDRn (n = 0,1) are compared with the contents of the up-

counter Tn. If a match is found, an timer interrupt request

flag TnIF is generated, and the counter is cleared to “0”.

The counter is restart and count up continuously by every

falling edge of the EC0 pin input.

The maximum frequency applied to the EC0 pin is fXIN/2

[Hz].

In order to use event counter function, the bit 4 of the Port

Mode Register PMR4(address 0D0H) is required to be set

to “1”.

After reset, the value of timer data register TDRn is unde-

fined, it should be initialized to between 1H~FFHnot to

"0"The interval period of Timer is calculated as below

equation.

Figure 11-6 Event Counter Mode Timing Chart

Figure 11-7 Count Operation of Timer / Event counter

Period (sec)

XIN

-----------

Divide Ratio

TDRn

n-1

EC0 pin input

Up-counter

TDR1

T1IF interrupt

Start count

Timer 1 (T1IF)

Interrupt

TDR1

TIME

Occur interrupt

stop

clear & start

disable

enable

Start & Stop

T1ST

T1CN

Control count

T1ST = 0

T1ST = 1

T1CN = 0

T1CN = 1

GMS82524TK Datasheet(PDF) 41 Page - Hynix Semiconductor

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