clk.asm

=== === =时钟20:6=== === === == 应先初始化状态寄存器 tx1714 EQU 7FFH PA EQU 05H PB EQU 06H PC EQU 07H

;=============时钟20:6====================
;应先初始化状态寄存器
        tx1714    EQU 7FFH
        PA        EQU 05H
	PB        EQU 06H
	PC        EQU 07H
	PD        EQU 20H
        IAR       EQU 00H	;间接寻址寄存器
        TMR0      EQU 01H	;定时器
        STATUS    EQU 03H	;状态寄存器
        BSR       EQU 04H	;bank选择寄存器
        PORTA     EQU 05H	;I/0端口寄存器
        PORTB     EQU 06H	;I/0端口寄存器
        PORTC     EQU 07H	;I/0端口寄存器
        PORTD     EQU 20H	;I/0端口寄存器
        PULL      EQU 21H	;PULL-High上拉寄存器
        WAKEUP    EQU 22H	;唤醒控制寄存器－－被用来设定watchdog允许和禁止
        IRQM      EQU 23H	;中断屏蔽寄存器
        IRQF      EQU 24H	;中断标志寄存器
        WDTSEL    EQU 25H
        TMR1_CON1 EQU 26H	;TMR1控制寄存器
        TMR1_CON2 EQU 27H	;TMR1_con2控制寄存器
        TMR2_CON  EQU 40H	;TMR2控制寄存器
        CP_VR     EQU 41H	;里置参考电源
        CP_OUT    EQU 42H	;比较器设置
        TMR1_T    EQU 43H	;TMR1重装寄存器
        TMR2_T    EQU 44H	;TMR2重装寄存器
        TMR1      EQU 45H
        TMR2      EQU 46H
      
	ORG  tx1714
        GOTO main
        ORG  7FEH
        LGOTO int_tmr1
        ORG  000H
main
	MOVLA 00H
	IODIR PA
	IODIR PB
	IODIR PC
	MOVAM BSR
	MOVAM STATUS
	MOVAM IRQF
        MOVAM 0AH
	MOVLA 05H
        MOVAM 08H
        MOVLA 03H
        MOVAM 09H
;-------------TMR1 定时20us------------------
        BCM TMR1_con2,7    ;定时器模式

        MOVLA 50H
        MOVAM TMR1_con1    ;设置时钟、预分频1：1
        
        MOVLA 57H
        MOVAM TMR1_T       ;装定时初值（递减）
	
        BSM TMR1_con1,7    ;使能定时器1
        BSM IRQM,7         ;开总中断
        BSM IRQM,5         ;开定时器1中断
        
LOOP
        BTMSS IRQF,5
        GOTO LOOP
        LGOTO HA

int_tmr1
        BCM IRQM,5      ;关定时器1
        BCM IRQF,5      ;清标志位
        
        DECM 08H,1
        MOVM 08H,0
        MOVAM PA
        INCM 08H,1

        DECMSZ 08H,1
        GOTO K1
        DECM 09H,1
        MOVM 09H,0
        MOVAM PB
                INCM 09H,1
        
                DECMSZ 09H,1
                GOTO K2
                INCM 0AH,1
                MOVM 0AH,0
                MOVAM PC

                MOVLA 03H
                MOVAM 09H
K2
        MOVLA 06H
        MOVAM 08H
K1
        MOVLA 57H
        MOVAM TMR1_T       ;装定时初值（递减）
        BSM IRQM,5
        RETI

HA      
        GOTO $
        END