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AT89LP428 数据表(PDF) 48 Page - ATMEL Corporation |
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AT89LP428 数据表(HTML) 48 Page - ATMEL Corporation |
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48 / 149 page  48 3654A–MICRO–8/09 AT89LP428/828 11.5.1 Mode 0 – 8-bit PWM with 8-bit Logarithmic Prescaler In Mode 0, TLx acts as a logarithmic prescaler driving 8-bit counter THx (see Figure 11-6). The PSCx bits in TCONB control the prescaler value. On THx overflow, the duty cycle value in RHx is transferred to OCRx and the output pin is set high. When the count in THx matches OCRx, the output pin is cleared low. The following formulas give the output frequency and duty cycle for Timer 0 in PWM mode 0. Timer 1 in PWM mode 0 is identical to Timer 0. Figure 11-6. Timer/Counter 1 PWM Mode 0 11.5.2 Mode 1 – 8-bit PWM with 8-bit Linear Prescaler In Mode 1, TLx provides linear prescaling with an 8-bit auto-reload from RLx (see Figure 11-7 on page 49). On TLx overflow, TLx is loaded with the value of RLx. THx acts as an 8-bit counter. On THx overflow, the duty cycle value in RHx is transferred to OCRx and the output pin is set high. When the count in THx matches OCRx, the output pin is cleared low. The following formulas give the output frequency and duty cycle for Timer 0 in PWM mode 1. Timer 1 in PWM mode 1 is identical to Timer 0. Mode 0: f OUT Oscillator Frequency 256 2 PSC0 1 + × ------------------------------------------------------- 1 TPS 1 + --------------------- × = Duty Cycle % 100 RH0 256 ------------ × = OSC TR1 GATE INT1 Pin TL1 (8 Bits) Control PSC1 TH1 (8 Bits) OCR1 RH1 (8 Bits) = T1 ÷TPS Mode 1: fOUT Oscillator Frequency 256 256 RL0 – () × ------------------------------------------------------- 1 TPS 1 + --------------------- × = Duty Cycle % 100 RH0 256 ------------ × = |
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