7477 datasheet(90/354 Pages) RENESAS

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1-73

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

HARDWARE

1.12 Timers

[Setting method]

1 The count operation of a timer to be used is stopped.

Refer to “Table 1.12.2 Setting for count stop.”

2 Set the pulse output mode according to the pulse output mode initial value setting shown in Table

1.12.10. However, set the timer FF register after setting timer mode register 2.

Table 1.12.10 Pulse output mode initial value setting

Note: 0: The initial value becomes “0.”

1: The initial value becomes “1.”

3 Set the pulse output mode according to the pulse output mode setting shown in Table 1.12.11.

The T0 output port and the T1 output port are used in common with P12 and P13, respectively.

Accordingly, set the bit 2 and bit 3 of the port P1 direction register to the output mode.

Table 1.12.11 Pulse output mode setting

4 Set a count value in Timer 1 (T0 output) and Timer 4 (T1 output).

5 When a value is set according to the count start setting shown in Table 1.12.8, the timer starts

to count.

Note: When resetting a value in the Timer FF register, be sure to observe the setting methods of

the above items

1 to 5.

Setting item

Timer to be used

Timer 1

Timer 4

Timer mode register 2

(TM2: Address 00FA16)

Timer FF mode register

(TF: Address 00F716)

–

Select (Note)

–

Timer

Timer 1

Timer 4

Output pin

Timer 1 overflow

signal / 2

Timer 4 overflow

signal / 2

Timer 12 mode register

(T12M: Address 00F816)

–

Timer 34 mode register

(T34M: Address 00F916)

–

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