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LTC1098L 数据表(PDF) 27 Page - Linear Technology |
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LTC1098L 数据表(HTML) 27 Page - Linear Technology |
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27 / 32 page  LTC1096/LTC1096L LTC1098/LTC1098L 27 10968fc TYPICAL APPLICATIONS Interfacing to the Parallel Port of the Intel 8051 Family The Intel 8051 has been chosen to demonstrate the interface between the LTC1098(L) and parallel port mi- croprocessors. Normally the CS, CLK and DIN signals would be generated on three port lines and the DOUT signal read on a fourth port line. This works very well. However, we will demonstrate here an interface with the DIN and DOUT of the LTC1098(L) tied together as described in the SERIAL INTERFACE section. This saves one wire. The 8051 first sends the start bit and MUX address to the LTC1098(L) over the data line connected to P1.2. Then P1.2 is reconfigured as an input (by writing to it a one) and the 8051 reads back the 8-bit A/D result over the same data line. DOUT from LTC1098(L) Stored in 8051 RAM CS CLK DOUT DIN LTC1098(L) ANALOG INPUTS P1.4 P1.3 P1.2 8051 MUX ADDRESS A/D RESULT 10968 TA06 R2 10968 TA07 MSB LSB B7 B6 B5 B4 B3 B2 B1 B0 1 CS CLK DATA (DIN/DOUT) START ODD/ SIGN MSBF B7 MSBF BIT LATCHED BY LTC1098(L) LTC1098(L) SENDS A/D RESULT BACK TO 8051 P1.2 8051 P1.2 OUTPUTS DATA TO LTC1098(L) 8051 P1.2 RECONFIGURED AS AN INPUT AFTER THE 4TH RISING CLK AND BEFORE THE 4TH FALLING CLK LTC1098(L) TAKES CONTROL OF DATA LINE ON 4TH FALLING CLK 23 4 SGL/ DIFF B6 B5 B4 B3 B2 B1 B0 10968 TA08 LABEL MNEMONIC OPERAND COMMENTS LOOP 1 LOOP MOV SETB CLR MOV RLC CLR MOV SETB DJNZ MOV CLR MOV MOV RLC SETB CLR DJNZ MOV SETB A, #FFH P1.4 P1.4 R4, #04 A P1.3 P1.2, C P1.3 R4, LOOP 1 P1, #04 P1.3 R4, #09 C, P1.2 A P1.3 P1.3 R4, LOOP R2, A P1.4 DIN word for LTC1098(L) Make sure CS is high CS goes low Load counter Rotate DIN bit into Carry CLK goes low Output DIN bit to LTC1098(L) CLK goes high Next bit Bit 2 becomes an input CLK goes low Load counter Read data bit into Carry Rotate data bit into Acc. CLK goes high CLK goes low Next bit Store MSBs in R2 CS goes high |
类似零件编号 - LTC1098L_15 |
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类似说明 - LTC1098L_15 |
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