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M32C/8A датащи(PDF) 182 Page - Renesas Technology Corp |
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M32C/8A датащи(HTML) 182 Page - Renesas Technology Corp |
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182 / 372 page ![]() M32C/8A Group 15. Timers (Timer A) Rev.1.00 Jul 15, 2007 Page 165 of 352 REJ09B0385-0100 Figure 15.20 8-bit Pulse Width Modulator Operation (Timer A) TAiS bit in the TABSR register IR bit in the TAiIC register PWM pulse output from TAiOUT pin i = 0 to 4 fj: Count source frequency (f1, f8, f2n(1), fC32) n: high-order bits in the TAi register (00h to FEh) m: low-order bits in the TAi register (00h to FFh) (Conditions) High-order bits in the TAi register are set to 02h. Low-order bits in the TAi register are set to 02h. TAiMR register: The MR1 bit is set to 0 (falling edge of signal applied to the TAiIN pin.) Signal applied to TAiIN pin When the TAiS bit is set to 0 (count stops) while the TAiOUT output is "H", the TAiOUT output becomes "L" and the IR bit becomes 1 (interrupt requested). Underflow signal of 8-bit prescaler Count starts End of 1 cycle Count stops Count source “H” “L” 1 0 “H” “L” 1 0 1 / fj x (m+1) x (28-1) Set to 1 by program Set to 0 by program 1 / fj x (m+1) x n Set to 0 by an interrupt request acknowledgement or by program NOTES: 1. Bits CNT3 to CNT0 in the TCSPR register select no division (n = 0) or divide-by-2n (n = 1 to 15). 2. The 8-bit pulse width modulator counts underflow signals of the 8-bit prescaler. |
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