7470 datasheet(74/361 Pages) RENESAS

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7470/7471/7477/7478 GROUP USER’S MANUAL

HARDWARE

1.12 Timers

[Setting method]

1 Set a value to be used according to the count source setting for timers. The count operation of

the timer is stopped. Refer to “Table 1.12.2 Setting for count stop.”

Table 1.12.2 Setting for count stop

2 Count source selecting

Select a count source according to the count source setting for timers shown in Table 1.12.3 to

Table 1.12.6.

Note that selectable count sources are different among timers.

Because the 7470/7477 group is not provided with an XCIN pin, do not select f(XCIN) as a count

source.

Table 1.12.3 Setting for timer 1 count source

Note: When f(XCIN) is selected as a timer count source, f(XIN) or f(XCIN) can be selected as a system clock.

Setting item

Timer

Timer 1

Timer 2

Timer 3

Timer 4

Timer 12 mode register

(T12M: Address 00F816)

Timer 34 mode register

(T34M: Address 00F916)

–

CPU mode register

(CM: Address 00FB16)

–

Timer 12 mode register

(T12M: Address 00F816)

–

Setting item

Count source

to be selected

f(XIN)/16

f(XCIN)

f(XCIN)/16

External clock input from

CNTR0 pin.

(Note)

Setting item

Count source

to be selected

f(XIN)/16

f(XIN)/64

f(XIN)/128

f(XIN)/256

f(XCIN)/16

f(XCIN)/64

f(XCIN)/128

f(XCIN)/256

Timer 1 overflow signal

CPU mode register

(CM: Address 00FB16)

–

Timer 12 mode register

(T12M: Address 00F816)

–

Table 1.12.4 Setting for timer 2 count source

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