7641 datasheet(146/385 Pages) RENESAS

146 / 385 page

Rev.2.00

Aug 28, 2006

page 15 of 148

7641 Group

REJ09B0336-0200

APPLICATION

2.2 Timer

Fig. 2.2.5 Structure of Timer X mode register

Timer X mode register

b7 b6 b5 b4 b3 b2 b1 b0

Timer X mode register

(TXM : address 2716)

Name

Functions

At reset R W

Timer X count source

select bits

CNTR0 active edge switch

bit

Timer X count stop bit

Timer X internal clock

select bit

0 : Write value in latch and counter

1 : Write value in latch only

b2b1

0 0 :

φ / 8

0 1 :

φ / 16

1 0 :

φ / 32

1 1 :

φ / 64

0 :

φ / n (n = 8, 16, 32, 64)

1 : SCSGCLK (Special Count Source Generator)

This function depends on the timer X

operating mode. (See below.)

0 : Count start

1 : Count stop

Timer X operating mode

bits

Timer X write control bit

b5b4

0 0 : Timer mode

0 1 : Pulse output mode

1 0 : Event counter mode

1 1 : Pulse width measurement mode

Timer X operating mode

CNTR0 active edge switch bit

Pulse output mode

0 : Starts at “H” output

1 : Starts at “L” output

Event counter mode

0 : Counts at rising edge

1 : Counts at falling edge

Pulse width measurement

mode

0 : Measures “H” pulse width

1 : Measures “L” pulse width

Interrupt

0 : Falling edge active

1 : Rising edge active

Function of CNTR0 active edge switch bit

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