13.4.3 spi接口语音录放模块isd4104.txt

c51单片机中的汇编子程序

SS		EQU		P1					
SCLK	EQU		P1.1					
MOSI	EQU		P1.2					
MIS0		EQU		P1.3					
PLAY	EQU		P1.4					
REC		EQU		P1.5				
STOP	EQU		P1.6					
WDT		EQU		P1.7				
RDBYTE:
CPL		WDT							
CLR		SS							
CLR		MOSI						
SETS	SCLK						
MOV	R2,#08H						
RDBYT1:
CLR		SCLK						
NOP								
MOV	C,MISO						
RLC		A							
SETS	SCLK						
NOP								
DJNZ	R2,RDBYT1					
SETS	SS							
RET									
WRBYTE:
CPL		WDT						
CLR		SS
CLR		SCLK						
MOV	R2,#08H						
WRBYTZ:
CLR		SCLK						
NOP									
RLC		A							
MOV	MOSI,C						
NOP								
SETB	SCLK
NOP
DJNZ	R2,WRBYTI					
SETB	SS							
RET									
MOV	A;#0F0H
ACALL	WRBYTE
MOV	A,#00H
ACALL	WRBYTE						
MOV	A,#30H						
ACALL	WRBYTE						
MOV	A,#00H
ACALL	WRBYTE
ACALL	RDBYTE						
MOV	ISDSTA,A						
ACALL	RDBYTE