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M38B57MC Fiches technique(PDF) 19 Page - Mitsubishi Electric Semiconductor |
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M38B57MC Fiches technique(HTML) 19 Page - Mitsubishi Electric Semiconductor |
19 / 69 page MITSUBISHI MICROCOMPUTERS 38B5 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 19 PRELIMINAR Y Notice: This is not a final specification. Some parametric limits are subject to change. Timers 8-Bit Timer The 38B5 group has six built-in timers : Timer 1, Timer 2, Timer 3, Timer 4, Timer 5, and Timer 6. Each timer has the 8-bit timer latch. All timers are down-counters. When the timer reaches “0016,” an underflow occurs with the next count pulse. Then the contents of the timer latch is reloaded into the timer and the timer continues down-counting. When a timer underflows, the interrupt request bit corresponding to that timer is set to “1.” The count can be stopped by setting the stop bit of each timer to “1.” The internal system clock can be set to either the high-speed mode or low-speed mode with the CPU mode register. At the same time, timer internal count source is switched to either f(XIN) or f(XCIN). qTimer 1, Timer 2 The count sources of timer 1 and timer 2 can be selected by setting the timer 12 mode register. A rectangular waveform of timer 1 underflow signal divided by 2 is output from the P45/T1OUT pin. The waveform polarity changes each time timer 1 overflows. The active edge of the external clock CNTR0 can be switched with the bit 6 of the interrupt edge selection register. At reset or when executing the STP instruction, all bits of the timer 12 mode register are cleared to “0,” timer 1 is set to “FF16,” and timer 2 is set to “0116.” qTimer 3, Timer 4 The count sources of timer 3 and timer 4 can be selected by setting the timer 34 mode register. A rectangular waveform of timer 3 underflow signal divided by 2 is output from the P46/T3OUT pin. The waveform polarity changes each time timer 3 overflows. The active edge of the external clock CNTR1 can be switched with the bit 7 of the interrupt edge selection register. qTimer 5, Timer 6 The count sources of timer 5 and timer 6 can be selected by setting the timer 56 mode register. A rectangular waveform of timer 6 underflow signal divided by 2 is output from the P44/PWM1 pin. The waveform polarity changes each time timer 6 overflows. qTimer 6 PWM1 Mode Timer 6 can output a rectangular waveform with “H” duty cycle n/ (n+m) from the P44/PWM1 pin by setting the timer 56 mode register (refer to Figure 16). The n is the value set in timer 6 latch (address 002516) and m is the value in the timer 6 PWM register (address 002716). If n is “0,” the PWM output is “L,” if m is “0,” the PWM output is “H” (n = 0 is prior than m = 0). In the PWM mode, interrupts occur at the rising edge of the PWM output. Fig. 14 Structure of Timer Related Register Timer 12 mode register (T12M: address 002816) Timer 1 count stop bit 0 : Count operation 1 : Count stop Timer 2 count stop bit 0 : Count operation 1 : Count stop Timer 1 count source selection bits 00 : f(XIN)/8 or f(XCIN)/16 01 : f(XCIN) 10 : f(XIN)/16 or f(XCIN)/32 11 : f(XIN)/64 or f(XCIN)/128 Timer 2 count source selection bits 00 : Underflow of Timer 1 01 : f(XCIN) 10 : External count input CNTR0 11 : Not available Timer 1 output selection bit (P45) 0 : I/O port 1 : Timer 1 output Not used (returns “0” when read) (Do not write “1” to this bit.) Timer 34 mode register (T34M: address 002916) Timer 3 count stop bit 0 : Count operation 1 : Count stop Timer 4 count stop bit 0 : Count operation 1 : Count stop Timer 3 count source selection bits 00 : f(XIN)/8 or f(XCIN)/16 01 : Underflow of Timer 2 10 : f(XIN)/16 or f(XCIN)/32 11 : f(XIN)/64 or f(XCIN)/128 Timer 4 count source selection bits 00 : f(XIN)/8 or f(XCIN)/16 01 : Underflow of Timer 3 10 : External count input CNTR 1 11 : Not available Timer 3 output selection bit (P4 6) 0 : I/O port 1 : Timer 3 output Not used (returns “0” when read) (Do not write “1” to this bit.) Timer 56 mode register (T56M: address 002A16) Timer 5 count stop bit 0 : Count operation 1 : Count stop Timer 6 count stop bit 0 : Count operation 1 : Count stop Timer 5 count source selection bit 0 : f(XIN)/8 or f(XCIN)/16 1 : Underflow of Timer 4 Timer 6 operation mode selection bit 0 : Timer mode 1 : PWM mode Timer 6 count source selection bits 00 : f(XIN)/8 or f(XCIN)/16 01 : Underflow of Timer 5 10 : Underflow of Timer 4 11 : Not available Timer 6 (PWM) output selection bit (P4 4) 0 : I/O port 1 : Timer 6 output Not used (returns “0” when read) (Do not write “1” to this bit.) b7 b0 b7 b0 b7 b0 |
Numéro de pièce similaire - M38B57MC |
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Description similaire - M38B57MC |
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