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LTC1290BCSW データシート(PDF) 15 Page - Linear Technology |
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LTC1290BCSW データシート(HTML) 15 Page - Linear Technology |
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15 / 28 page  15 LTC1290 S APPLICATI I FOR ATIO MICROWIRE and MICROWIRE PLUS are trademarks of National Semiconductor Corp LTC1290 • AI08 SCLK DOUT LTC1290 CS ANALOG INPUTS GO SK SI COP402 DIN SO B6 B5 B4 B7 FIRST 4 BITS SECOND 4 BITS B10 B9 B8 B11 DOUT from LTC1290 Stored in COP402 RAM MSB† LOCATION $13 LOCATION $14 B2 B1 B0 B3 THIRD 4 BITS LSB LOCATION $15 • • • • †B11 IS MSB IN UNIPOLAR OR SIGN BIT IN BIPOLAR National MICROWIRE (COP402) The COP402 transfers data MSB first and in 4-bit incre- ments (nibbles). This is easily accommodated by setting the LTC1290 to MSB-first format and 12-bit word length. The data output word is then received by the COP402 in three 4-bit blocks. COP402 Code MNEMONIC COMMENTS CLRA Must be First Instruction LBI 1,0 BR = 1BD = 0 Initialize B Reg. STII 8 First DIN Nibble in $10 STII E Second DIN Nibble in $11 STII 0 Null Data in $12, B = $13 LEI C Set EN to (1100) BIN LOOP SC Carry Set LDD 1,0 Load First DIN Nibble In ACC OGI 0 Go (CS) Cleared XAS ACC to Shift Reg. Begin Shift LDD 1,1 Load Next DIN Nibble in ACC NOP Timing XAS Next Nibble, Shift Continues XIS 0 First Nibble DOUT to $13 LDD 1,2 Put Null Data in ACC XAS Shift Continues, DOUT to ACC XIS 0 Next Nibble DOUT to $14 RC Clear Carry CLRA Clear ACC XAS Third Nibble DOUT to ACC OGI 1 Go (CS) Set XIS 0 Third Nibble DOUT to $15 LBI 1,3 Set B Reg. For Next Loop Motorola SPI (MC68HC05C4) The MC68HC05C4 transfers data MSB first and in 8-bit increments. Programming the LTC1290 for MSB-first format and 16-bit word length allows the 12-bit data output to be received by the MPU as two 8-bit bytes with the final four unused bits filled with zeros by the LTC1290. Hardware and Software Interface to COP402 Processor Table 2. Microprocessors with Hardware Serial Interfaces Compatible with the LTC1290** PART NUMBER TYPE OF INTERFACE Motorola MC6805S2, S3 SPI MC68HC11 SPI MC68HC05 SPI RCA CDP68HC05 SPI Hitachi HD6305 SCI Synchronous HD6301 SCI Synchronous HD63701 SCI Synchronous HD6303 SCI Synchronous HD64180 SCI Synchronous National Semiconductor COP400 Family MICROWIRE TM COP800 Family MICROWIRE/PLUS TM NS8050U MICROWIRE/PLUS HPC16000 Family MICROWIRE/PLUS Texas Instruments TMS7002 Serial Port TMS7042 Serial Port TMS70C02 Serial Port TMS70C42 Serial Port TMS32011* Serial Port TMS32020 Serial Port TMS370C050 SPI *Requires external hardware ** Contact factory for interface information for processors not on this list |
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