3822 datasheet(39/328 Pages) RENESAS

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

3822 Group

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

Timer 2 write control bit

0 : Write data in latch and counter

1 : Write data in latch only

Timer 2 count source selection bit

0 : Timer 1 output

1 : f(XIN)/16

(or f(XCIN)/16 in low-speed mode)

Timer 3 count source selection bit

0 : Timer 1 output

1 : f(XIN)/16

(or f(XCIN)/16 in low-speed mode)

Timer 1 count source selection bit

0 : f(XIN)/16

(or f(XCIN)/16 in low-speed mode)

1 : f(XCIN)

Not used (return “0” when read)

Timer 123 mode register

(T123M : address 002916)

Note : Internal clock

φ is f(XCIN)/2 in the low-speed mode.

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. The timer

latch value is not affected by a change of the count source. How-

ever, because changing the count source may cause an inadvert-

ent count down of the timer. Therefore, rewrite the value of timer

whenever the count source is changed.

Timer 2 Write Control

If the timer 2 write control bit is “0”, when the value is written in the

address of timer 2, the value is loaded in the timer 2 and the latch

at the same time.

If the timer 2 write control bit is “1”, when the value is written in the

address of timer 2, the value is loaded only in the latch. The value

in the latch is loaded in timer 2 after timer 2 underflows.

Timer 2 Output Control

When the timer 2 (TOUT) is output enabled, an inversion signal

from pin TOUT is output each time timer 2 underflows.

In this case, set the port P56 shared with the port TOUT to the out-

put mode.

Note on Timer 1 to Timer 3

When the count source of timer 1 to 3 is changed, the timer count-

ing value may be changed large because a thin pulse is generated

in count input of timer . If timer 1 output is selected as the count

source of timer 2 or timer 3, when timer 1 is written, the counting

value of timer 2 or timer 3 may be changed large because a thin

pulse is generated in timer 1 output.

Therefore, set the value of timer in the order of timer 1, timer 2 and

timer 3 after the count source selection of timer 1 to 3.

Fig. 20 Structure of timer 123 mode register

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