7641 datasheet(45/385 Pages) RENESAS

45 / 385 page

Rev.2.00

Aug 28, 2006

page 28 of 113

7641 Group

REJ09B0336-0200

HARDWARE

FUNCTIONAL DESCRIPTION

Timer 1, Timer 2, Timer 3

Timer 1, timer 2, and timer 3 are 8-bit timers. The count source for

each timer can be selected by timer 123 mode register.

q Timers 1, 2 Write Control

When the Timers 1, 2 Write Control Bit is “1” and the values are

written in the address of timers 1 and 2, the values are loaded only

in their latches. The values in the latches are loaded in timers 1

and 2 after timers 1 and 2 underflow.

When the Timers 1, 2 Write Control Bit is “0” and the values are

written in the address of timers 1 and 2, the values are loaded in

the timers 1 and 2 and their latches at the same time.

q Timers 1, 2 Output Control

A signal of which polarity is inverted each time the timer selected

by the TOUT Factor Select Bit underflows is output from the TOUT

pin. This is enabled by setting the TOUT Output Control Bit to “1”.

When the TOUT Output Active Edge Switch Bit is “0”, the TOUT pin

starts pulses output beginning at “H”; when this bit is “1”, the TOUT

pin starts pulses output beginning at “L”.

When using a timer in this mode, set the port P51 direction regis-

ter to output mode.

s Notes

q Timer 1 to Timer 3

Switching of the count sources of timers 1 to 3 does not affect the

values of reload latches. However, that may make count operation

started. Therefore, write values again in the order of timers 1, 2

and then timer 3 after their count sources have been switched.

q Timers 1, 2 Write Control

When the value is to be written in latch only, unexpected value

may be set in the timer if the writing in the latch and the timer un-

derflow are performed at the same timing.

Fig. 22 Structure of timer 123 mode register

Timer 123 mode register (address 002916)

T123M

TOUT factor select bit

0: Timer 1 output

1: Timer 2 output

Timer 1 count stop bit

0: Count start

1: Count stop

Timer 1 count source select bit

0 :

φ / 8

1 : f(XCIN) / 2

Timer 2 count source select bit

0 : Timer 1 output

1 :

Timer 3 count source select bit

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

0: TOUT output disabled

1: TOUT output enabled

Timers 1, 2 write control bit

0: Write value in latch and counter

1: Write value in latch only

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