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LTC1090CSW 数据表(PDF) 16 Page - Linear Technology |
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LTC1090CSW 数据表(HTML) 16 Page - Linear Technology |
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16 / 28 page  16 LTC1090 1090fc Motorola SPI (MC68HC05C4) The MC68HC05C4 transfers data MSB first and in 8-bit increments. Programming the LTC1090 for MSB first format and 16-bit word length allows the 10-bit data output to be received by the MPU as two 8-bit bytes with the final 6 unused bits filled with zeroes by the LTC1090. Hardware and Software Interface to Motorola MC68HC05C4 Processor Hitachi Synchronous SCI (HD63705) The HD63705 transfers serial data in 8-bit increments, LSB first. To accommodate this, the LTC1090 is programmed for 16-bit word length and LSB first format. The 10-bit output data is received by the processor as two 8-bit bytes, LSB first. The LTC1090 fills the final 6 unused bits (after the MSB) with zeroes in unipolar mode and with the sign bit in bipolar mode. Hardware and Software Interface to Hitachi HD63705 Processor APPLICATIO S I FOR ATIO MNEMONIC DESCRIPTION BCLR n C0 is cleared (CS goes Low) LDA Load DIN for LTC1090 into ACC STA Load DIN from ACC to SPI data reg. Start SCK ↑ NOP 8 NOPs for timing ↓ LDA Load contents of SPI status reg. into ACC LDA Load LTC1090 DOUT from SPI data reg. into ACC (byte 1) STA Load LTC1090 DOUT into RAM (location A) STA Start next SPl cycle ↑ NOP 6 NOPs for timing ↓ BSET n C0 is set (CS goes high) LDA Load contents of SPI status reg. into ACC LDA Load LTC1090 DOUT from SPI data reg. into ACC (byte 2) STA Load LTC1090 DOUT into RAM (location A + 1) LTC1090 ANALOG INPUTS DOUT DOUT from LTC1090 stored in MC68HCO5C4 RAM DIN SCLK CO SCK MOSI MISO MC68HCO5C4 CS B9 Location A Location A + 1 byte 1 byte 2 *B9 is MSB in unipolar or sign bit in bipolar MSB* LSB B8 B7 B6 B5 B4 B3 B2 B1 B0 0 0 0 0 0 0 LTC1090 • AI12 MNEMONIC DESCRIPTION LDA Load DIN word for LTC1090 into ACC from RAM BCLR n C0 cleared (CS goes low) STA Load DIN word for LTC1090 into SCI data reg. from ACC and start clocking data (LSB first) ↑ NOP 6 NOPs for timing ↓ LDA Load contents of SCI data reg. into ACC (byte 1) Start next SCI cycle STA Load LTC1090 DOUT word into RAM (Location A) NOP Timing BSET n C0 set (CS goes high) LDA Load contents of SCI data reg. into ACC (byte 2) STA Load LTC1090 DOUT word into RAM (Location A + 1) LTC1090 ANALOG INPUTS DOUT DOUT from LTC1090 stored in HD63705 RAM DIN SCLK C0 CK TX RX HD63705 CS B7 Location A Location A + 1 Bipolar Sign byte 1 byte 2 LSB B6 B5 B4 B3 B2 B1 B0 B9 B9 B9 B9 B9 B9 B9 B8 LTC1090 • AI13 B7 Location A Location A + 1 Unipolar byte 1 byte 2 LSB MSB B6 B5 B4 B3 B2 B1 B0 00 0 0 0 0 B9 B8 |
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