7641 datasheet(144/385 Pages) RENESAS

144 / 385 page

Rev.2.00

Aug 28, 2006

page 13 of 148

7641 Group

REJ09B0336-0200

APPLICATION

2.2 Timer

Fig. 2.2.3 Structure of Timer 123 mode register

Fig. 2.2.2 Structure of Timer i (i=1, 2, 3)

2.2.2 Related registers

(1) 8-bit timer

Timer i (i = 1 to 3)

b7 b6 b5 b4 b3 b2 b1 b0

Timer 1, Timer 2, Timer 3

(T1, T2, T3: addresses 2416, 2516, 2616)

(Note)

Functions

At reset R W

qTimer i’s count value is set through this register.

qTimer 1 and Timer 2

Writing operation depends on the timers 1, 2 write control bit.

When it is “0”, the values are simultaneously written into their

latches and counters.

When it is “1”, the values are written into only their latches.

qTimer 3

The values are simultaneously written into their latches and

counters.

qWhen reading this register’s address, its timer’s count values are

read out.

qThe timer causes an underflow at the count pulse following the

count where the timer contents reaches “0016”. Then The contents

of latches are automatically reloaded into the timer.

(Note)

Note: Timer 1 and Timer 3’s values are “FF16”. Timer 2 ’s value are “0116”.

Timer 123 mode register

b7 b6 b5 b4 b3 b2 b1 b0

Timer 123 mode register

(T123M : address 2916)

Name

Functions

At reset R W

Timer 1 count stop bit

Timer 2 count source

select bit

Timer 3 count source

select bit

Timer 1 count source

select bit

0 : Timer 1 output

1 : Timer 2 output

0 : Count start

1 : Count stop

0 :

φ / 8

1 : f(XCIN) / 2

0 : Timer 1 output

1 :

0 : Timer 1 output

1 :

φ / 8

TOUT output active edge

switch bit

0 : Start at “H” output

1 : Start at “L” output

TOUT output control bit

Timers 1, 2 write control bit

0 : TOUT output disabled

1 : TOUT output enabled

0 : Write value in latch and counter

1 : Write value in latch only

TOUT factor select bit

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