7470 datasheet(87/361 Pages) RENESAS

tên linh kiện	7470

Giải thích chi tiết về linh kiện	8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES

PDF	361 Pages

Scroll/Zoom	100%

nhà sản xuất	RENESAS [Renesas Technology Corp]

Trang chủ	http://www.renesas.com

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

1-80

HARDWARE

1.12 Timers

1.12.4 Updating of contents of Timer and Timer latch

After data is written to the Timer, the contents of the Timer and the Timer latch are updated.

2 Timer 1 and Timer 2

When data is written to the Timer, this data is set in the Timer and the Timer latch at the same time.

As a result, after data is written to the Timer which is in count operation, the count period becomes

invalid.

Figure 1.12.8 shows an example of updating of the contents of Timer 1, Time 2 and Timer latch.

Fig. 1.12.8 Example of updating of Timer 1, Timer 2 and Timer latch

(n-1)16

FF16

(m-1)16

m16

• OF: Overflow

• RL: Reload

• n: Timer 1 initial value before updating

• m: Timer 1 initial value after updating

Writing “m16” to timer 1

Example of updating of Timer 1

Timer 1 interrupt

request bit

Timer 1 interrupt

enable bit

Time

• Clearing by writing “0” to the Timer 1 interrupt request bit.

• Clearing by accepting the Timer 1 interrupt request when the Timer 1 interrupt enable bit is “1.”

A :

Incorrect count period

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