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7477 Datasheet(PDF) 82 Page - Renesas Technology Corp |
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7477 Datasheet(HTML) 82 Page - Renesas Technology Corp |
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82 / 354 page  1-65 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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