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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LS7366R Fiches technique(PDF) 13 Page - LSI Computer Systems |
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LS7366R Fiches technique(HTML) 13 Page - LSI Computer Systems |
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13 / 13 page  ;Sample routines for PIC18CXXX interface /***********************************************************************************************************************/ ;Initialize PIC18Cxxx portc in LS7366 compatible SPI ;Setup: master mode, SCK idle low, SDI/SDO datashift on high to low transition of SCK ;SS/ assertion/deassertion made with direct manipulation of RA5 ;Initialize portc CLRF PORTC ;Clear portc CLRF LATC ;Clear data latches MOVLW 0x10 ;RC4 is input, RC3 & RC5 are outputs MOVWF TRISC ;RC3=CLK, RC4=SDI, RC5=SDO BCF TRISA, 5 ;RA5=output BSF PORTA, 5 ;RA5=SS/=high CLRF SSPSTAT ;SMP=0 => SDI data sampled at mid-data BSF SSPSTAT, CKE ;CKE=1 => data shifts on active to idle SCK transitions MOVLW 0x21 ;SPI mode initialization data MOVWF SSPCON ;Master mode, CLK/16, CKP=0 => CLK idles low ;data shifted on active to idle CLK edge /***********************************************************************************************************************/ ; WR_MDR0 BSF PORTA, 5 ;SS/=high BCF PORTA, 5 ;SS/=low MOVLW 0x88 ;LS7366 WR_MDR0 command MOVWF SSPBUF ;Transmit command byte LOOP1 BTFSS SSPSTAT, BF ;Transmission complete with BF flag set? BRA LOOP1 ;No, check again MOVF SSPBUF, W ;Dummy read to clear BF flag. MOVLW 0xA3 ;MDR0 data:fck/2, synchronous index. index=rcntr, x4 MOVWF SSPBUF ;Transmit data LOOP2 BTFSS SSPSTAT, BF ;BF set? BRA LOOP2 ;No, check again BSF PORTA, 5 ;SS/=high /***********************************************************************************************************************/ ;RD_MDR0 BSF PORTA, 5 ;SS/=high BCF PORTA, 5 ;SS/=low MOVLW 0x48 ;LS7366 RD_MDR0 command MOVWF SSPBUF ;Transmit command byte LOOP1 BTFSS SSPSTAT, BF ;BF flag set? BRA LOOP1 ;No, check again MOVWF SSPBUF ;Send dummy byte to generate clock & receive data LOOP2 BTFSS SSPSTAT, BF ;BF flag set? BRA LOOP2 ;No, check again MOVF SSPBUF, W ;Recieved data in WREG. MOVWF RXDATA ;Save received data in RAM BSF PORTA, 5 ;SS/=high 7366R-041906-13 |
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