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7721 データシート(PDF) 135 Page - Renesas Technology Corp |
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7721 データシート(HTML) 135 Page - Renesas Technology Corp |
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135 / 577 page  TIMER A 7721 Group User’s Manual 8–16 8.3 Timer mode (2) Pulse output function The pulse output function is selected by setting the pulse output function select bit (bit 2 at addresses 5816 to 5A16) to “1.” When this function is selected, the TAjOUT pin is forcibly set for the pulse output pin regardless of the corresponding bits of the port P5 direction register. The TAjOUT pin outputs pulses of which polarity is inverted each time a counter underflow occurs. When the count start bit (address 4016) is “0” (count stopped), the TAjOUT pin outputs “L” level. Figure 8.3.6 shows an example of operation with the pulse output function selected. Fig. 8.3.6 Example of operation selecting pulse output function FFFF16 n 000016 Time Count start bit Timer Aj interrupt request bit n = Reload register’s contents Cleared to “0” when interrupt request is accepted or cleared by software. Set to “1” by software. Starts counting. Pulse output from TAjOUT pin Set to “1” by software. Cleared to “0” by software. Starts counting. Restarts counting. |
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