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HD6433713 Datasheet(PDF) 153 Page - Renesas Technology Corp |
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HD6433713 Datasheet(HTML) 153 Page - Renesas Technology Corp |
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153 / 324 page  2. Real-time clock time base operation When bit TMA3 in TMA is set to 1, timer A functions as a time base for a real-time clock by counting clock signals output by prescaler W. The overflow period of timer A is set by bits TMA1 and TMA0 in TMA. A choice of four periods is available. 3. Count initialization When bits TMA3 and TMA2 are both set to 1, PSW and TCA are initialized (cleared to 0 and stopped). From this initialized state, if bit TMA3 is left set to 1 and bit TMA2 is cleared to 0, timer A begins counting from 0 in time base mode. From the initialized state, if bit TMA3 is cleared to 0, timer A begins counting from 0 in interval timer mode. (Bit TMA2 can be either set or cleared.) However, since prescaler S (PSS) has not been initialized, the time between clearing bit TMA3 to 0 and the first count will vary. 142 |
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