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LS7366R 数据表(PDF) 13 Page - LSI Computer Systems

部件名 LS7366R
功能描述  32-BIT QUADRATURE COUNTER WITH SERIAL INTERFACE
PDF  13 Pages
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制造商  LSI [LSI Computer Systems]
网页  http://www.lsicsi.com
标志 LSI - LSI Computer Systems

LS7366R 数据表(HTML) 13 Page - LSI Computer Systems

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;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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