Josef Hanzal, M. S. [snail at iol.cz] of Snail Instruments +420-311-624433 says:
I have used SPI on PIC16C73 in slave mode to catch data sent to MAX7213 LED display driver. As far as I remember, it worked without much troubles. Extracted code below. The underscored bit names are #defines including the proper register, like #define _C STATUS,0CBLOCK __GPRAM TEMPW, TEMPS, TEMPF FLAGS ... SSPADR... .... ENDC CBLOCK 0x60 SSPDAT:SSPBLEN ENDC #define _FSSPDT FLAGS,6 ; ================================================================ ; INTERRUPT--INTERRUPT--INTERRUPT--INTERRUPT--INTERRUPT--INTERRUPT ; ================================================================ ORG 4 _INT_SAVE_REG TEMPW, TEMPS SSPINT: BTFSS _SSPIF GOTO INTER BCF _SSPIF BTFSC _FSSPDT ;flag indicates if address or data GOTO SSPI0 ;was received, it is MAX7213 specific MOVF SSPBUF,W ADDLW SSPDAT MOVWF SSPADR BSF _FSSPDT GOTO IEND SSPI0: MOVFF FSR,TEMPF MOVFF SSPADR,FSR MOVFF SSPBUF,INDF MOVFF TEMPF,FSR GOTO IEND INTER: BTFSS _INTF ;RB0 connected to CS of Maxim GOTO IEND BCF _INTF BCF _FSSPDT BSF _FDSUPD ;GOTO IEND IEND: _INT_RESTORE_REG TEMPW,TEMPS RETFIE SPI inicialization: LDB SSPCON,B'00110101' ;ENABLE SPI SLAVE, RECEIVE ON RISING EDGE LDB RCSTA,1<<SPEN|1<<CREN ;ENABLE RECEIVE, ENABLE SERIAL ASYNC. COMM. Macros: MOVFF S,D = MOVF S,W; MOVWF D LDB F,K = MOVLW K; MOVWF F
|file: /Techref/microchip/16c73/spislave.htm, 2KB, , updated: 2006/4/7 21:07, local time: 2022/6/25 21:51,
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<A HREF="http://piclist.com/techref/microchip/16c73/spislave.htm"> PIC Microcontoller Input / Ouput Method - 16C73 SPI Slave Mode</A>
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