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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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LTC1291 Folha de dados(PDF) 13 Page - Linear Technology |
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LTC1291 Folha de dados(HTML) 13 Page - Linear Technology |
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13 / 20 page  13 LTC1291 S APPLICATI I FOR ATIO Sharing the Serial Interface The LTC1291 can share the same 3-wire serial interface with other peripheral components or other LTC1291s LABEL MNEMONIC OPERAND COMMENTS SETB P1.4 CS GOES HIGH CONT MOV A,#98H DIN WORD FOR LTC1291 CLR P1.4 CS GOES LOW MOV R4,#05H LOAD COUNTER LOOP1 RLC A ROTATE DIN BIT INTO CARRY CLR P1.3 CLK GOES LOW MOV P1.2,C OUTPUT DIN BIT TO LTC1291 SETB P1.3 CLK GOES HIGH DJNZ R4,LOOP1 NEXT DIN BIT MOV P1,#04H P1.2 BECOMES AN INPUT CLR P1.3 CLK GOES LOW MOV R4,#09H LOAD COUNTER LOOP MOV C,P1.2 READ DATA BIT INTO CARRY RLC A ROTATE DATA BIT (B3) INTO ACC SETB P1.3 CLK GOES HIGH CLR P1.3 CLK GOES LOW DJNZ R4,LOOP NEXT DOUT BIT MOV R2,A STORE MSBS IN R2 MOV C,P1.2 READ DATA BIT INTO CARRY SETB P1.3 CLK GOES HIGH LABEL MNEMONIC OPERAND COMMENTS 8051 Code (Figure 3). The CS signals decide which LTC1291 is being addressed by MPU. Figure 3. Several LTC1291s Sharing One 3-Wire Serial Interface LTC1291 2 CHANNELS 2 CHANNELS 2 CHANNELS CS CS CS 3 3 3 3 3-WIRE SERIAL INTERFACE TO OTHER PERIPHERALS OR LTC1291s 2 10 OUTPUT PORT SERIAL DATA MPU LTC1291 F03 LTC1291 LTC1291 CLR P1.3 CLK GOES LOW CLR A CLEAR ACC RLC A ROTATE DATA BIT (B3) INTO ACC MOV C,P1.2 READ DATA BIT INTO CARRY RLC A ROTATE DATA BIT (B2) INTO ACC SETB P1.3 CLK GOES HIGH CLR P1.3 CLK GOES LOW MOV C,P1.2 READ DATA BIT INTO CARRY RLC A ROTATE DATA BIT (B1) INTO ACC SETB P1.3 CLK GOES HIGH CLR P1.3 CLK GOES LOW MOV C,P1.2 READ DATA BIT INTO CARRY SETB P1.4 CS GOES HIGH RRC A ROTATE DATA BIT (B0) INTO ACC RRC A ROTAGE RIGHT INTO ACC RRC A ROTAGE RIGHT INTO ACC RRC A ROTAGE RIGHT INTO ACC MOV R3,A STORE LSBs IN R3 AJMP CONT START NEXT CONVERSION In this example the input MUX is configured to accept a differential input between CH0 and CH1. The result from the conversion is clocked out MSB-first. |
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