高效D类多媒体音频功率放大器设计(含电路图、源程序)

N

Y
N

Y

图3 主程序流程

DIS:

N
Y

图4

源程序。供本刊网站使用。
ORG 0000H
AJMP MAIN
ORG 000BH
AJMP DIS
ORG 0030H
MAIN: MOV SP,#070H ;初始化

MOV 30H,#03H
MOV 31H,#0B0H
MOV 32H,#0C0H
MOV 33H,#0F3H
MOV 34H,#00H
MOV TMOD,#00H ;置T0定时器方式0
MOV TH0,#0E0H ;定时初值1mS
MOV TL0,#018H
SETB EA ;开放总中断
SETB ET0 ;开放T0中断
SETB TR0 ;启动T0
SETB P1.7
SETB P3.7
LOOP: JNB P1.7,AT0
JNB P3.7,AT1
LOOP1: MOV DPTR,#JPTAB
MOV A,30H
CLR C
RLC A
JNC NADD
INC DPH
NADD: JMP @A+DPTR
JPTAB: AJMP L0
AJMP L1
AJMP L2
AJMP L3
AJMP L4
AJMP L5
AJMP L6
AJMP L7
AJMP L8
AJMP L9
AJMP L10
AJMP L11
AJMP L12
AJMP L13
AJMP L14
AJMP L15

DIS: PUSH ACC ;保护现场
MOV P3,33H ;P3.3~3.0输出（控制音量）
MOV A,34H
CJNE A,#00H,FX1
MOV P1,31H ;显示数码管个位
CLR P3.4
SETB P3.5
MOV 34H,#01H
AJMP FX2
FX1:MOV P1,32H ;显示数码管十位
SETB P3.4
CLR P3.5
MOV 34H,#00H
FX2:MOV TL0,#018H ;定时初值1mS
MOV TH0,#0E0H
POP ACC ;恢复现场
REti

AT0:ACALL DEL20MS ;调用20mS延时子程序
JB P1.7,A2
MOV A,30H
CJNE A,#0FH,A1; ;30H内容为0FH，退出
AJMP A2
A1: INC 30H ;30H内容加1
ACALL DEL300MS ;延时300mS
A2: AJMP LOOP1 ;跳转到LOOP1

AT1:ACALL DEL20MS ;调用20mS延时子程序
JB P3.7,B2
MOV A,30H
CJNE A,#00H,B1 ;30H内容为00H，退出
AJMP B2
B1: DEC 30H ;30H内容减1
ACALL DEL300MS ;延时300mS
B2: AJMP LOOP1 ;跳转到LOOP1

L0: MOV 31H,#0C0H ;显示00
MOV 32H,#0C0H
MOV 33H,#0F0H ;P3.3~3.0输出0000
AJMP LOOP
L1: MOV 31H,#0F9H ;显示01
MOV 32H,#0C0H
MOV 33H,#0F1H ;P3.3~3.0输出0001
AJMP LOOP
L2: MOV 31H,#0A4H ;显示02
MOV 32H,#0C0H
MOV 33H,#0F2H ;P3.3~3.0输出0010
AJMP LOOP
L3: MOV 31H,#0B0H ;显示03
MOV 32H,#0C0H
MOV 33H,#0F3H ;P3.3~3.0输出0011
AJMP LOOP
L4: MOV 31H,#099H ;显示04
MOV 32H,#0C0H
MOV 33H,#0F4H ;P3.3~3.0输出0100
AJMP LOOP
L5: MOV 31H,#092H ;显示05
MOV 32H,#0C0H
MOV 33H,#0F5H ;P3.3~3.0输出0101
AJMP LOOP
L6: MOV 31H,#082H ;显示06
MOV 32H,#0C0H
MOV 33H,#0F6H ;P3.3~3.0输出0110
AJMP LOOP
L7: MOV 31H,#0F8H ;显示07
MOV 32H,#0C0H
MOV 33H,#0F7H ;P3.3~3.0输出0111
AJMP LOOP
L8: MOV 31H,#080H ;显示08
MOV 32H,#0C0H
MOV 33H,#0F8H ;P3.3~3.0输出1000
AJMP LOOP
L9: MOV 31H,#090H ;显示09
MOV 32H,#0C0H
MOV 33H,#0F9H ;P3.3~3.0输出1001
AJMP LOOP
L10: MOV 31H,#0C0H ;显示10
MOV 32H,#0F9H
MOV 33H,#0FAH ;P3.3~3.0输出1010
AJMP LOOP
L11: MOV 31H,#0F9H ;显示11
MOV 32H,#0F9H
MOV 33H,#0FBH ;P3.3~3.0输出1011
AJMP LOOP
L12: MOV 31H,#0A4H ;显示12
MOV 32H,#0F9H
MOV 33H,#0FCH ;P3.3~3.0输出1100
AJMP LOOP
L13: MOV 31H,#0B0H ;显示13
MOV 32H,#0F9H
MOV 33H,#0FDH ;P3.3~3.0输出1101
AJMP LOOP
L14: MOV 31H,#099H ;显示14
MOV 32H,#0F9H
MOV 33H,#0FEH ;P3.3~3.0输出1110
AJMP LOOP
L15: MOV 31H,#092H ;显示15
MOV 32H,#0F9H
MOV 33H,#0FFH ;P3.3~3.0输出1111
AJMP LOOP

DEL2MS: MOV R7,#02H ; 1mS延时子程序
DL0: MOV R6,#0FFH
DL1: DJNZ R6,DL1
DJNZ R7,DL0
RET

DEL20MS: MOV R5,#0AH ; 20mS延时子程序
DL2: ACALL DEL2MS
DJNZ R5,DL2
RET;

DEL300MS: MOV R3,#0FH ; 300mS延时子程序
DL4: ACALL DEL20MS
DJNZ R3,DL4
RET
END