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M32C/86 датащи(PDF) 190 Page - Renesas Technology Corp |
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M32C/86 датащи(HTML) 190 Page - Renesas Technology Corp |
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190 / 505 page ![]() Page 167 9 7 4 f o 5 0 0 2 , 8 0 . p e S 0 0 . 1 . v e R 0 0 1 0 - 4 0 2 0 B 9 0 J E R 15. Timer (Timer B) ) T 6 8 / C 2 3 M , 6 8 / C 2 3 M ( p u o r G 6 8 / C 2 3 M 15.2.2 Event Counter Mode In event counter mode, the timer counts how many external signals are applied or how many times another timer overflows and underflows. (See Table 15.10) Figure 15.21 shows the TBiMR register (i=0 to 5) in event counter mode. Table 15.10 Event Counter Mode Specifications Item Specification Count Source • External signal applied to the TBiIN pin (i = 0 to 5) (valid edge can be selected by program) • TBj overflow or underflow signal (j=i-1, except j=2 when i=0, j=5 when i=3) Counting Operation • The timer decrements a counter value When the timer counter underflows, content of the reload register is reloaded into the count register to continue counting Divide Ratio 1/(n+1) n : setting value of the TBi register 000016 to FFFF16 Counter Start Condition The TBiS bits in the TABSR and TBSR register are set to "1" (starts counting) Counter Stop Condition The TBiS bit is set to "0" (stops counting) Interrupt Request Generation Timing The timer counter underflows TBiIN Pin Function Programmable I/O port or count source input Read from Timer The TBi register indicates counter value Write to Timer • When the timer counter stops, the value written to the TBi register is also written to both reload register and counter • While counting, the value written to the TBi register is written to the reload register (It is transferred to the counter at the next reload timing) |
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