check_battery.asm

来自「基于MOTOLOLAR单片机的TPMS发送控制器代码设计」· 汇编 代码 · 共 22 行

;/* LVI status check routine                      */
;/* V0.1   17 July, 2002 Jeff Burgess             */
;/* Called with:  jsr    SEND_BYTE                */
;/* Returns:      STATUS[7,6] containing the data */
;/*               from LVISR[7,5] respectively.   */
;/* (c) 2002 Motorola                             */

Check_battery:
        psha
        lda     LVISR
        sta     T3
        brclr   LOWV,T3,Chk_dead
        bset    6,STATUS

Chk_dead:
        brclr   LVIOUT,T3,Not_dead
        bset    LVIOUT,STATUS

Not_dead:
        pula
        rts