7643 datasheet(42/424 Pages) RENESAS

42 / 424 page

Rev.2.00

Aug 28, 2006

page 25 of 103

REJ09B0133-0200

OVERVIEW

FUNCTIONAL DESCRIPTION

7643 Group

TIMERS

The 7643 group has three 8-bit timers: timer 1, timer 2, and timer 3.

All timers are down count timers. When the timer reaches “0016”,

an underflow occurs at the next count pulse and the correspond-

ing timer latch is reloaded into the timer and the count is

continued. When a timer underflows, the interrupt request bit cor-

responding to that timer is set to “1”.

Fig. 19 Timer block diagram

P51/TOUT/XCOUT

Timer 1 interrupt

request

Timer 2 interrupt

request

Timer 3 interrupt

request

Timer 1 count

source select bit

“0”

“1”

φ / 8

f(XCIN) / 2

Timer 1 count

stop bit

Timer 1 latch (8)

Timer 1 (8)

Timers 1, 2 write control

bit

Timers 1, 2 write control

bit

“0”

“1”

Timer 2 count

source select bit

Timer 2 latch (8)

Timer 2 (8)

TOUT output control bit

“0”

“1”

TOUT output active

edge switch bit

TOUT output

control bit

TOUT source

select bit

TOUT output control bit

“0”

“1”

TOUT output active

edge switch bit

φ / 8

Timer 3 count

source select bit

Timer 3 latch (8)

Timer 3 (8)

“0”

“1”

Data bus

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