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LTC1292DI Datasheet(PDF) 12 Page - Linear Technology |
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LTC1292DI Datasheet(HTML) 12 Page - Linear Technology |
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12 / 24 page  12 LTC1292/LTC1297 S APPLICATI I FOR ATIO Figure 5. Hardware and Software Interface to Intel 8051 Processor LABEL MNEMONIC OPERAND COMMENTS MOV P1,#02h BIT 1 PORT 1 SET AS INPUT CLR P1.3 CLK GOES LOW SETB P1.4 CS GOES HIGH CONT CLR P1.4 CS GOES LO NOP 4 NOP FOR LTC1297 tsuCS (Wakeup NOP Time) (Not Needed for LTC1292) NOP NOP SETB P1.3 CLK GOES HIGH CLR P1.3 CLK GOES LOW SETB P1.3 CLK GOES HIGH CLR P1.3 CLK GOES LOW MOV R4,#08H LOAD COUNTER LOOP MOV C,P1.1 READ DATA BIT INTO CARRY RLC A ROTATE DATA BIT INTO ACC SETB P1.3 CLK GOES HIGH CLR P1.3 CLK GOES LOW DJNZ R4,LOOP NEXT BIT MOV R2,A STORE MSBs IN R2 MOV C,P1.1 READ DATA BIT INTO CARRY CLR A CLEAR ACC RLC A ROTATE DATA BIT (B3) INTO ACC SETB P1.3 CLK GOES HIGH CLR P1.3 CLK GOES LOW MOV C,P1.1 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,P1.1 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,P1.1 READ DATA BIT INTO CARRY SETB P1.4 CS GOES HIGH RRC A ROTATE DATA BIT (B0) INTO ACC RRC A ROTATE RIGHT INTO ACC RRC A ROTATE RIGHT INTO ACC RRC A ROTATE RIGHT INTO ACC MOV R3,A STORE LSBs IN R3 AJMP CONT START NEXT CONVERSION LABEL MNEMONIC OPERAND COMMENTS 8051 CODE Sharing the Serial Interface The LTC1292/LTC1297 can share the same two-wire serial interface with other peripheral components or other LTC1292/LTC1297s (Figure 6). In this case, the CS signals decide which LTC1292 is being addressed by the MPU. ANALOG CONSIDERATIONS Grounding The LTC1292/LTC1297 should be used with an analog ground plane and single point grounding techniques. Do not use wire wrapping techniques to breadboard and evaluate the device. To achieve the optimum performance DOUT FROM LTC1292/LTC1297 STORED IN 8051 RAM B3 B2 B0 B1 O O OO R3 B7 B6 B5 B4 B10 B9 B8 B11 R2 MSB ANALOG INPUTS CLK DOUT LTC1292 LTC1297 CS P1.4 P1.3 P1.1 8051 LTC1292/7 F05 CS DOUT B11 B7 B8 B9 B10 B4 B5 B6 B3 B2 B1 B0 CLK |
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