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M34286G2-XXXGP Datasheet(PDF) 11 Page - Renesas Technology Corp |
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M34286G2-XXXGP Datasheet(HTML) 11 Page - Renesas Technology Corp |
11 / 66 page Rev.1.00 Aug 06, 2008 page 11 of 64 REJ03B0251-0100 4286 Group Fig. 12 Auto-reload function TIMERS The 4286 Group has the programmable timer. • Programmable timer The programmable timer has a reload register and enables the frequency dividing ratio to be set. It is decremented from a setting value n. When it underflows (count to n + 1), a timer 1 underflow flag is set to “1,” new data is loaded from the reload register, and count continues (auto-reload function). FF16 n 0016 n: Counter initial value Count starts Reload Reload 1st underflow 2nd underflow n+1 count n+1 count Time A skip instruction is executed Timer 1 underflow flag “1” “0” The 4286 Group timer consists of the following circuit. •Timer 1 : 8-bit programmable timer •Timer 2 : 8-bit programmable timer These timers can be controlled with the timer control registers V1 and V2. Each timer function is described below. Table 3 Function related timer Circuit Timer 1 Timer 2 14-bit timer Structure 8-bit programmable binary down counter 8-bit programmable binary down counter 14-bit fixed frequency Count source • Carrier wave output (CARRY) • Bit 5 of watchdog timer • f(XIN) • f(XIN)/2 • Instruction clock Frequency dividing ratio 1 to 256 1 to 256 16384 Use of output signal • Carrier wave output control • Carrier wave output • Watchdog timer • Timer 1 count source Control register V1 V2 |
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