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4508 Datasheet(PDF) 26 Page - Renesas Technology Corp |
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4508 Datasheet(HTML) 26 Page - Renesas Technology Corp |
26 / 142 page Rev.1.02 2006.12.22 page 26 of 140 REJ03B0148-0102 4508 Group TIMERS The 4508 Group has the following timers. • 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 interrupt re- quest flag is set to “1,” new data is loaded from the reload register, and count continues (auto-reload function). • Fixed dividing frequency timer The fixed dividing frequency timer has the fixed frequency dividing ratio (n). An interrupt request flag is set to “1” after every n count of a count pulse. Fig. 21 Auto-reload function Count source • Instruction clock (INSTCK) • PWM2 signal (PWMOD2) • Prescaler output (ORCLK) • CNTR1 input • On-chip oscillator clock (f(RING)) • Timer 1 underflow (T1UDF) • Prescaler output (ORCLK) • CNTR0 input • System clock (STCK) • Instruction clock (INSTCK) Structure 8-bit programmable binary down counter 8-bit programmable binary down counter (link to INT input) (with PWM output function) 8-bit programmable binary down counter (INT input period count function) (with PWM output function) 16-bit fixed dividing frequency Circuit Prescaler Timer 1 Timer 2 Watchdog timer Use of output signal • Timer 1 and 2 count sources • Timer 2 count source • CNTR0 output • Timer 1 interrupt • Timer 1 count source • CNTR1 output • Timer 2 interrupt • System reset (counting twice) • Decision of flag WDF1 Frequency dividing ratio 1 to 256 1 to 256 1 to 256 65536 Control register PA W1 W5 W6 W2 W5 W6 - The 4508 Group timer consists of the following circuits. • Prescaler : 8-bit programmable timer • Timer 1 : 8-bit programmable timer • Timer 2 : 8-bit programmable timer (Timers 1 and 2 have the interrupt function, respectively) • 16-bit timer Prescaler and timers 1 and 2 can be controlled with the timer control registers PA, W1, W2 , W5 and W6. The 16-bit timer is a free counter which is not controlled with the control register. Each function is described below. Table 9 Function related timers FF16 n 0016 n : Counter initial value Count starts Reload Reload 1st underflow 2nd underflow n+1 count n+1 count Time An interrupt occurs or a skip instruction is executed. Timer interrupt request flag “1” “0” |
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