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M38C34M6A Fiches technique(PDF) 21 Page - Mitsubishi Electric Semiconductor |
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M38C34M6A Fiches technique(HTML) 21 Page - Mitsubishi Electric Semiconductor |
21 / 62 page 21 SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER MITSUBISHI MICROCOMPUTERS 38C3 Group ts Timer 6 count source n ! ts m ! ts (n+m) ! ts Note: PWM waveform (duty : n/(n+m) and period : (n+m) ! ts) is output. n: setting value of Timer 6 m: setting value of Timer 6 PWM register ts: period of Timer 6 count source Timer 6 interrupt request Timer 6 interrupt request Timer 6 PWM mode Fig. 18 Timing chart of timer 6 PWM1 mode 16-bit Timer Timer A is a 16-bit timer that can be selected in one of four modes by the timer A mode register and the timer A control register. qTimer A The timer A operates as down-count. When the timer contents reach “000016”, an underflow occurs at the next count pulse and the timer latch contents are reloaded. After that, the timer continues count- down. When the timer underflows, the interrupt request bit correspond- ing to the timer A is set to “1”. (1) Timer mode The count source can be selected by setting the timer A mode regis- ter. (2) Pulse output mode Pulses of which polarity is inverted each time the timer underflows are output from the TAOUT pin. Except for that, this mode operates just as in the timer mode. When using this mode, set port P50 sharing the TAOUT pin to output mode. (3) IGBT output mode After dummy output from the TAOUT pin, count starts with the INT0 pin input as a trigger. When the trigger is detected or the timer A underflows, “H” is output from the the TAOUT pin. When the count value corresponds with the compare register value, the TAOUT output becomes “L”. When the INT0 signal becomes “H”, the TAOUT output is forced to become “L”. After noise is cleared by noise filters, judging continuous 4-time same levels with sampling clocks to be signals, the INT0 signal can use 4 types of delay time by a delay circuit. When using this mode, set port P55 sharing the INT0 pin to input mode and set port P50 sharing the TAOUT pin to output mode. It is possible to force the timer A output to be “L” using pins INT1 and INT2 by the timer A control register. (4) PWM mode IGBT dummy output, an external trigger with the INT0 pin and output control with pins INT1 and INT2 are not used. Except for those, this mode operates just as in the IGBT output mode. The period of PWM waveform is specified by the timer A set value. The “H” term is specified by the compare register set value. When using this mode, set port P50 sharing the TAOUT pin to output mode. |
Numéro de pièce similaire - M38C34M6A |
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Description similaire - M38C34M6A |
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