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LTC1290BCSW Scheda tecnica(PDF) 28 Page - Linear Technology |
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LTC1290BCSW Scheda tecnica(HTML) 28 Page - Linear Technology |
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28 / 32 page  28 LTC1290 1290fe S APPLICATI TYPICAL SNEAK-A-BIT Code for the LTC1290 Using the MC68HC05C4 MNEMONIC DESCRIPTION READ –/+: LDA #$3F Load DIN Word for LTC1290 into ACC JSR TRANSFER Read LTC1290 Routine LDA $60 Load MSBs from LTC1290 into ACC STA $71 Store MSBs in $71 LDA $61 Load LSBs from LTC1290 into ACC STA $72 Store LSBs in $72 RTS Return READ +/–: LDA #$7F Load DIN Word for LTC1290 into ACC JSR TRANSFER Read LTC1290 Routine LDA $60 Load MSBs from LTC1290 into ACC STA $73 Store MSBs in $73 LDA $61 Load LSBs from LTC1290 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 SPIF 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 SPIF 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 Go to 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 Go to 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 SNEAK-A-BIT Code DOUT from LTC1290 in MC68HC05C4 RAM DIN Words for LTC1290 Sign LSB MUX Addr. UNI MSBF Word Length DIN1 0 0 11 11 11 DIN2 0 1 11 11 11 DIN3 0 0 11 11 11 (ODD/SIGN) 1290 TA06 LOCATION $77 B12 B11 B10 B9 B8 B7 B6 B5 LOCATION $87 B4 B3 B2 B1 B0 Filled with 0s SNEAK-A-BIT Code for the LTC1290 Using the MC68HC05C4 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 LTC1290 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 |
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