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Я читаю C167CR User's Manual, но скорее всего это не принципиально, у них блок GPT1 должен быть одинаковый.
Раздел "10: General Purpose Timer Units -> 10.1: Timer Block GPT1 -> 10.1.1: GPT Core Timer T3", стр. 10-5. Читаем:
An overflow or underflow of timer T3 will clock the toggle bit T3OTL in control register T3CON. T3OTL can also be set or reset by software. Bit T3OE (Alternate Output Function Enable) in register T3CON enables the state of T3OTL to be an alternate function of the external output pin T3OUT. For that purpose, a ‘1’ must be written into the respective port data latch (* то есть P3.3 = 1 *) and pin T3OUT must be configured as output by setting the corresponding direction control bit to ‘1’ (* то есть DP3.3 = 1 *).
С уважением, Михаил.
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