7477 datasheet(82/354 Pages) RENESAS

tên linh kiện	7477

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

PDF	354 Pages

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nhà sản xuất	RENESAS [Renesas Technology Corp]

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

HARDWARE

1.12 Timers

1.12.2 Description of modes

(1) Timer mode

The operations of the timer modes are as explained below.

1 Start of count operation

When the count stop bit is cleared to “0,” a count operation starts. When there is a count source

input, the contents of the timer are decremented by 1.

Note: Because the count stop bit is “0” immediately after reset release, the count operation is

automatically started after reset release.

2 Reload operation

When the timer overflows, the value resulting from decrementing 1 from the contents of the timer

latch is transferred (reloaded) to the timer.

3 Interrupt operation

2Timer interrupt

When the timer overflows, an interrupt request occurs, so that the interrupt request bit is set

to “1.” The acceptance of interrupt is controlled by the interrupt enable bit of each timer.

4 Stop of count operation

When the counter stop bit is set to “1” by software, the count operation stops. (The count operation

continues until the count stop bit is set to “1.”)

Figure 1.12.3 shows an example of timer mode operation.

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