;只显示时分
RG_KEY EQU 30H;存储键盘值
RG_KN EQU 33H;存储调节年月日星期的次数按钮。
RG_BT1 EQU 31H;需要显示的数据暂存RAM
RG_BT2 EQU 32H
RG_TSC EQU 40H;时钟和闹钟暂存RAM，顺序同DS12C887中的RAM
RG_ASC EQU 41H
RG_TMN EQU 42H;TMN:TIME‘S MINU
RG_AMN EQU 43H;AMN:ALARM’S MINUT
RG_THR EQU 44H
RG_AHR EQU 45H
RG_WK EQU 46H
RG_DAY EQU 47H
RG_MTH EQU 48H
RG_YR EQU 49H
RG_MS EQU 51H
RG_IDL EQU 50H
ORG 0000H
LJMP MAIN
ORG 0030H
;Main procedure
MAIN: MOV SP,#60H
MOV DPTR,#000BH;闹钟中断允许
MOV A,#22H
MOVX @DPTR,A
MOV DPTR,#000AH;判断是否需要初始化
MOVX A,@DPTR
ANL A,#01110000B
CJNE A,#20H,INI_MAI
LJMP LP1_MAI
INI_MAI:LCALL SB_INI
LP1_MAI:LCALL SB_RD
LCALL SB_DSP
AJMP LP1_MAI
SB_INI: PUSH ACC
PUSH PSW
PUSH DPH
PUSH DPL
MOV DPTR,#000BH ; register B of DS'
MOV A,#0A2H
MOVX @DPTR,A ; un-renew,BCD,24hour
;----初始化时钟，11:59
MOV DPTR,#0000H ; addr. of second
MOV A,#00H
MOVX @DPTR,A
INC DPTR ; addr. of S'alarm
MOV A,#00H
MOVX @DPTR,A
INC DPTR ; addr. of minute
MOV A,#59H
MOVX @DPTR,A
INC DPTR ; addr. of M'alarm
MOV A,#00H
MOVX @DPTR,A
INC DPTR ; addr. of hour
MOV A,#11H
MOVX @DPTR,A
INC DPTR ; addr. of H'alarm
MOV A,#00H
MOVX @DPTR,A
;---初始化星期3(日), 年，月，日2008-2-20
INC DPTR
MOV A,#03H
MOVX @DPTR,A
INC DPTR
MOV A,#20H
MOVX @DPTR,A
INC DPTR
MOV A,#02H
MOVX @DPTR,A
INC DPTR
MOV A,#08H
MOVX @DPTR,A
MOV DPTR,#0032H
MOV A,#20H
MOVX @DPTR,A
MOV DPTR,#000AH ; register A of DS'
MOV A,#20H
MOVX @DPTR,A ; start timebase
INC DPTR ; register B of DS'
MOV A,#22H
MOVX @DPTR,A ; renew,permit IRQ,.
INC DPTR ; register C of DS'
MOVX A,@DPTR ; read to clear IRQF
INC DPTR
MOVX A,@DPTR
POP DPL
POP DPH
POP PSW
POP ACC
RET
SB_RD: PUSH ACC
PUSH DPH
PUSH DPL
;---读时分的时钟，
MOV 23H,#08H
RD1: MOV DPTR,#0002H;时钟的分
MOVX A,@DPTR
MOV RG_TMN,A
MOV DPTR,#0004H;时钟的时
MOVX A,@DPTR
MOV RG_THR,A
DJNZ 23H,RD1
POP DPL
POP DPH
POP ACC
RET
SB_DSP: PUSH ACC
PUSH DPH
PUSH DPL
PUSH PSW
MOV R1,#RG_THR
MOV R6,#10H ;R6寄存器选择位
MOV R7,#2
LP1_DSP: MOV A,@R1
ANL A,#0F0H
SWAP A
ORL A,R6
MOV P1,A ;送到P1口
LCALL SB_DLY;调延时子程序
MOV A,R6
RL A
MOV R6,A
MOV A,@R1
ANL A,#0FH
ORL A,R6
MOV P1,A ;送到P1口
LCALL SB_DLY;调延时子程序
MOV A,R6
RL A
MOV R6,A
DEC R1
DEC R1
DJNZ R7,LP1_DSP
RT_DSP: POP PSW
POP DPL
POP DPH
POP ACC
RET
;=======延时子程序
SB_DLY:
MOV 21H,#04
D1: MOV 22H,#200
DJNZ 22H,$
DJNZ 21H,D1
RET
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