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LM386是一種音頻集成功放，具有自身功耗低、電壓增益可調(diào)整、電源電壓范圍大、外接元件少和總諧波失真小等優(yōu)點(diǎn)的功率放大器，廣泛應(yīng)用于錄音機(jī)和收音機(jī)之中。
引腳2為反相輸入端，3為同相輸入端；引腳5為輸出端；引腳6和4分別為電源和地；引腳1和8為電壓增益設(shè)定端；使用時(shí)在引腳7和地
之間接旁路電容，通常取10μF。
匯編程序如下： - CCON EQU 0D8H
- CCF0 BIT CCON.0
- CCF1 BIT CCON.1
- CMOD EQU 0D9H
- CL EQU 0E9H
- CH EQU 0F9H
- CCAPM0 EQU 0DAH
- CCAP0L EQU 0EAH
- CCAP0H EQU 0FAH
- CR BIT CCON.6
- CF BIT CCON.7
- ORG 0000H
- LJMP MAIN
- ORG 000BH
- LJMP T0_INT
- ORG 003BH
- LJMP PCA_INT
- ORG 0100H
- MAIN:
- MOV SP,#64H
- MOV R1,#15
- MOV R7,#1AH
- MOV R6,#29H
- MOV TMOD,#01H
- MOV CCON,#0
- CLR A
- MOV CL,A
- MOV CH,A
- MOV CMOD,#02H
- MOV CCAP0L,R7
- MOV CCAP0H,R6
- MOV CCAPM0,#04DH
- MOV R0,#01H
- SETB CR
- SETB EA
- SETB ET0
- SETB TR0
- SJMP $
- T0_INT:
- DJNZ R1,T0_
- MOV R1,#15
- MOV A,R0
- RL A
- MOV DPTR,#TABLE
- MOVC A,@A+DPTR
- MOV R7,A
- MOV A,R0
- RL A
- INC A
- MOVC A,@A+DPTR
- MOV R6,A
- INC R0
- CJNE R0,#07H,T0_
- MOV R0,#00H
- T0_
- :
- RETI
- PCA_INT:
- PUSH PSW
- PUSH ACC
- CLR CCF0
- MOV A,CCAP0L
- ADD A,R7
- MOV CCAP0L,A
- MOV A,CCAP0H
- ADDC A,R6
- MOV CCAP0H,A
- POP ACC
- POP PSW
- RETI
- TABLE:
- DB1AH,29H,47H,25H,8FH,20H,0CCH,1EH,81H,1BH,0EAH,17H,9FH,15H
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