📄 timer_a.lst
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565 /**************************************************************************/
566 /* */
567 /* Timer A1 - Initialization for pwm mode */
568 /* The timer outputs pulses of a given width */
569 /* routine may be customized to the user's needs */
570 /* */
571 /* Name : timer_a1_init_pwm_mode */
572 /* Date/Author : 08.04.1997/ST */
573 /* Parameter : */
574 /* Return : */
575 /* */
576 /**************************************************************************/
577 void near timer_a1_init_pwm_mode (void)
578 {
\ 0000E9 EC80 PUSHM R0
579 TA1MR = 0x07; // XXXX X111
\ 0000EB C7079703 MOV.B #7,919
580 // |||| |||+- must always be 1 in pwm mode
581 // |||| ||+-- must always be 1 in pwm mode
582 // |||| |+--- must always be 1 in pwm mode
583 // |||| +---- 0: ext. trigger falling edge of
584 // |||| TA1in input signal
585 // |||| 1: ext. trigger rising edge of
586 // |||| TA1in input signal
587 // |||| TA1in must be configured as input
588 // |||| TA1in must be selected by
589 // |||| event/trigger select bits
590 // |||+------ 0: trigger is count start flag (TABSR)
591 // ||| 1: trigger is selected by event/trigger
592 // ||| select bits
593 // ||+------- 0: 16-bit pwm
594 // || 1: 8-bit pwm
595 // |+-------- count source select bits
596 // +--------- count source select bits
597 // 00: f1
598 // 01: f8
599 // 10: f32
600 // 11: fc32
601
602
603 TRGSR &= ~(0x03); // ---- --XX
\ 0000EF 97FC8303 AND.B #252,899
604 // |+- timer A1 event/trigger select bits
605 // +-- timer A1 event/trigger select bits
606 // 00: input on TA1in (TA1in must be input)
607 // 01: overflow of timer B2
608 // 10: overflow of timer A0
609 // 11: overflow of timer A2
610
611 // Clock prescaler reset flag
612 // This function is only effective if fc32 is selected
613 if ((TA1MR & 0xC0)==0xC0)
\ 0000F3 74C0C0 MOV.B #192,R0L
\ 0000F6 139703 AND.B 919,R0L
\ 0000F9 7680C0 CMP.B #192,R0L
\ 0000FC 6E06 JNE ?0011
\ ?0010:
614 {
615 CPSRF = 0x80; // 1--- ----
\ 0000FE 74CF8103 MOV.B #128,897
\ 80
\ ?0011:
616 // +---------- 1: clock prescaler is reset
617 }
618 }
\ 000103 ED01 POPM R0
\ 000105 F3 RTS
\ timer_a1_start:
619
620 /**************************************************************************/
621 /* */
622 /* Timer A1 - start */
623 /* In following cases this routine takes no effect: */
624 /* - in one-shot timer mode if ext. trigger or timer overflow is */
625 /* selected as start condition */
626 /* - in pwm mode if external trigger or timer overflow is selected */
627 /* as start condition */
628 /* */
629 /* Name : timer_a1_start */
630 /* Date/Author : 08.04.1997/ST */
631 /* Parameter : */
632 /* Return : */
633 /* */
634 /**************************************************************************/
635 void near timer_a1_start (void)
636 {
637 TABSR |= 0x02; // ---- --1-
\ 000106 9F028003 OR.B #2,896
638 // +-- 1: start timer A1 (count flag)
639
640 ONSF |= 0x02; // ---- --1-
\ 00010A 9F028203 OR.B #2,898
641 // +-- 1: start timer A1 (one-shot flag)
642 }
\ 00010E F3 RTS
\ timer_a1_stop:
643
644 /**************************************************************************/
645 /* */
646 /* Timer A1 - stop */
647 /* In following cases this routine takes no effect: */
648 /* - in one-shot timer mode if ext. trigger or timer overflow is */
649 /* selected as start condition */
650 /* - in pwm mode if external trigger or timer overflow is selected */
651 /* as start condition */
652 /* */
653 /* Name : timer_a1_stop */
654 /* Date/Author : 08.04.1997/ST */
655 /* Parameter : */
656 /* Return : */
657 /* */
658 /**************************************************************************/
659 void near timer_a1_stop (void)
660 {
661 TABSR &= ~(0x02); // ---- --0-
\ 00010F 97FD8003 AND.B #253,896
662 // +-- 0: stop timer A1 (count flag)
663
664 ONSF &= ~(0x02); // ---- --0-
\ 000113 97FD8203 AND.B #253,898
665 // +-- 0: stop timer A1 (one-shot flag)
666 }
\ 000117 F3 RTS
\ timer_a1_get:
667
668 /**************************************************************************/
669 /* */
670 /* Timer A1 - get current value */
671 /* */
672 /* Name : timer_a1 get */
673 /* Date/Author : 08.04.1997/ST */
674 /* Parameter : */
675 /* Return : - current count value in timer mode or event */
676 /* counter mode */
677 /* - indeterminate in one-shot mode or pwm mode */
678 /* */
679 /**************************************************************************/
680 unsigned int near timer_a1_get (void)
681 {
682 return(TA1);
\ 000118 73F08803 MOV.W 904,R0
683 }
\ 00011C F3 RTS
\ timer_a1_set:
684
685 /**************************************************************************/
686 /* */
687 /* Timer A1 - set current value */
688 /* when counting stopped : write value to reload register and */
689 /* counter */
690 /* when counting in progress: write value only to reload register */
691 /* transferred to counter at next reload */
692 /* time */
693 /* In 8-bit pwm mode highbyte gives time of high level and */
694 /* lowbyte gives time of low level */
695 /* */
696 /* Name : timer_a1_set */
697 /* Date/Author : 08.04.1997/ST */
698 /* Parameter : load value */
699 /* Return : */
700 /* */
701 /**************************************************************************/
702 void near timer_a1_set (unsigned int value)
703 {
\ 00011D EC02 PUSHM SB
\ 00011F 7540 PUSH.W R0
\ 000121 EB52 PUSHC SP
\ 000123 EB63 POPC SB
704 TA1 = value;
\ 000125 73AF0088 MOV.W 0[SB],904
\ 03
705 }
\ 00012A 7DB2 ADD.B #2,SP
\ 00012C ED40 POPM SB
\ 00012E F3 RTS
\ timer_a1_interrupt_set:
706
707 /**************************************************************************/
708 /* */
709 /* Timer A1 - set interrupt */⌨️ 快捷键说明
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