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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC1090CSW датащи(PDF) 24 Page - Linear Technology |
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LTC1090CSW датащи(HTML) 24 Page - Linear Technology |
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24 / 28 page  24 LTC1090 1090fc TYPICAL APPLICATIO Sneak-A-Bit Code for the LTC1090 Using the MC68HC05C4 MNEMONIC DESCRIPTION READ–/+: LDA #$3F Load DIN word for LTC1090 into ACC JSR TRANSFER Read LTC1090 routine LDA $60 Load MSBs from LTC1090 into ACC STA $71 Store MSBs in $71 LDA $61 Load LSBs from LTC1090 into ACC STA $72 Store LSBs in $72 RTS Return READ+/–: LDA #$7F Load DIN word for LTC1090 into ACC JSR TRANSFER Read LTC1090 routine LDA $60 Load MSBs from LTC1090 into ACC STA $73 Store MSBs in $73 LDA $61 Load LSBs from LTC1090 into ACC STA $74 Store LSBs in $74 RTS Return TRANSFER: BCLR 0, $02 CS goes low STA $0C Load DIN into SPI. Start transfer LOOP 1: TST $0B Test status of SPlF BPL LOOP 1 Loop to previous instruction if not done LDA $0C Load contents of SPI data reg into ACC STA $0C Start next cycle STA $60 Store MSBs in $60 LOOP 2: TST $0B Test status of SPlF BPL LOOP 2 Loop to previous instruction if not done BSET 0, $02 CS goes high LDA $0C Load contents of SPI data reg into ACC STA $61 Store LSBs in $61 RTS Return CHK SIGN: LDA $73 Load MSBs of +/– read into ACC ORA $74 Or ACC (MSBs) with LSBs of +/– read BEQ MINUS If result is 0 goto minus CLC Clear carry ROR $73 Rotate right $73 through carry ROR $74 Rotate right $74 through carry LDA $73 Load MSBs of +/– read into ACC STA $77 Store MSBs in RAM location $77 LDA $74 Load LSBs of +/– read into ACC STA $87 Store LSBs in RAM location $87 BRA END Goto end of routine MINUS: CLC Clear carry ROR $71 Shift MSBs of – /+ read right ROR $72 Shift LSBs of – /+ read right COM $71 1’s complement of MSBs COM $72 1’s complement of LSBs LDA $72 Load LSBs into ACC ADD #$01 Add 1 to LSBs STA $72 Store ACC in $72 CLRA Clear ACC ADC $71 Add with carry to MSBs. Result in ACC STA $71 Store ACC in $71 STA $77 Store MSBs in RAM location $77 LDA $72 Load LSBs in ACC STA $87 Store LSBs in RAM location $87 END: RTS Return MNEMONIC DESCRIPTION LDA #$50 Configuration data for SPCR STA $0A Load configuration data into $0A LDA #$FF Configuration data for port C DDR STA $06 Load configuration data into port C DDR BSET 0, $02 Make sure CS is high JSR READ– /+ Dummy read configures LTC1090 for next read JSR READ+/– Read CH6 with respect to CH7 JSR READ– /+ Read CH7 with respect to CH6 JSR CHK SIGN Determines which reading has valid data, converts to 2’s complement and stores in RAM SNEAK-A-BIT Sneak-A-Bit Code for the LTC1090 Using the MC68HC05C4 LTC1090 • TA05 1ST CONVERSION 1ST CONVERSION 1024 STEPS 5V –5V 5V –5V 0V 0V 0V 2ND CONVERSION 1024 STEPS SOFTWARE 2047 STEPS ( + ) CH6 ( – ) CH7 VIN VIN 2ND CONVERSION SNEAK-A-BIT Code ( – ) CH6 ( + ) CH7 VIN DOUT from LTC1090 in MC68HC05C4 RAM DIN words for LTC1090 Location $77 Sign LSB B2 B1 B0 B10 B9 B8 filled with 0s B7 B6 B5 B4 B3 Location $87 (ODD/SIGN) MUX Addr. Word Length UNI MSBF DIN 1 001 1 1111 DIN 2 011 1 1111 DIN 3 001 1 1111 |
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