Question

单片机的问题

项目任务：若单片机的振荡频率为11.0592MHz。用定时器T0（方式一）中断控制四位数码管倒计时。（从99开始倒计时。）
根据题目要求在Protues软件中绘制出单片机原理图

Answer 1

K1 EQU P1.0
K2 EQU P1.1
K3 EQU P1.2
ORG 0000H
LJMP MAIN
ORG 000BH
LJMP T0ISR
ORG 0030H
MAIN:
    MOV TMOD,#01H
    MOV TH0,#HIGH(65536-9216)
    MOV TL0,#LOW(65536-9216)
    SETB ET0
	SETB TR0
    SETB EA
	MOV R0,#9
	MOV R1,#9
	MOV R2,#0
	MOV R3,#99
	CLR 00H
	CLR 01H
LOOP:
	JB K1,LP01
	JNB K1,$
	CLR 01H
	INC R3
	CJNE R3,#100,LOOP0
	MOV R3,#0
	SJMP LOOP0
LP01:
	JB K2,LP02
	JNB K2,$
	CLR 01H
	CJNE R3,#0,LP011
	MOV R3,#99
	SJMP LOOP0
LP011:
	DEC R3
	SJMP LOOP0
LP02:
	JB K3,LOOP
	JNB K3,$
	SETB 01H
	SJMP LOOP
LOOP0:
	MOV A,R3
	MOV B,#10
	DIV AB
	MOV R0,B
	MOV R1,A
	SJMP LOOP
T0ISR:
    CLR TR0
    MOV TH0,#HIGH(65536-9216)
    MOV TL0,#LOW(65536-9216)
    SETB TR0
	MOV DPTR,#TABLE
T0C:
	CPL 00H
	JB 00H,T001
	MOV P3,#0FDH
	MOV A,R1
	MOVC A,@A+DPTR
	MOV P2,A
	SJMP T002
T001:
	MOV P3,#0FEH
	MOV A,R0
	MOVC A,@A+DPTR
	MOV P2,A
T002:
	JNB 01H,T0E
	INC R2
	MOV A,R2
	CJNE A,#100,T0E
	MOV R2,#0
	MOV A,R0
	JZ T003
	DEC R0
	SJMP T0E
T003:
	MOV A,R1
	JZ T004
	DEC R1
	MOV R0,#9
T0E:
	RETI
T004:
	CLR 01H
	MOV R4,#16
T005:
	CPL P0.0
	LCALL DELAY
	DJNZ R4,T005
	RETI
DELAY:
	MOV R6,#200
DLY:
	MOV R7,#250
	DJNZ R7,$
	DJNZ R6,DLY
	RET
TABLE:      ; 共阴极数码管显示代码表
    DB    3FH,06H,5BH,4FH,66H ;01234
    DB    6DH,7DH,07H,7FH,6FH ;56789

	END

Answer 2

99是两位数，要四位数码管干吗

追问

倒计时啊....而且题目是这样

Answer 3

用PROteus做仿真啊..把程序编译成HEX文件导入单片机...