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LTC2404CG Datasheet(PDF) 30 Page - Linear Technology |
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LTC2404CG Datasheet(HTML) 30 Page - Linear Technology |
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30 / 36 page  30 LTC2404/LTC2408 APPLICATIONS INFORMATION DIN1 EQU $00 This memory location holds the LTC2408’s bits 31 - 24 DIN2 EQU $01 This memory location holds the LTC2408’s bits 23 - 16 DIN3 EQU $02 This memory location holds the LTC2408’s bits 15 - 08 DIN4 EQU $03 This memory location holds the LTC2408’s bits 07 - 00 MUX EQU $04 This memory location holds the MUX address data * *************************************** * Start GETDATA Routine * *************************************** * ORG $C000 Program start location * LDS $CFFF Top of C page RAM, beginning location of stack INIT1 LDAA #$2F -,-,1,0;1,1,1,1 * -, -, SS*-Hi, SCK-Lo, MOSI-Hi, MISO-Hi, X, X STAA PORTD Keeps SS* a logic high when DDRD, bit 5 is set LDAA #$38 -,-,1,1;1,0,0,0 STAA DDRD SS* , SCK, MOSI are configured as Outputs * MISO, TxD, RxD are configured as Inputs * DDRD’s bit 5 is a 1 so that port D’s SS* pin is a general output LDAA #$50 STAA SPCR The SPI is configured as Master, CPHA = 0, CPOL = 0 * and the clock rate is E/2 * (This assumes an E-Clock frequency of 4MHz. For higher * E-Clock frequencies, change the above value of $50 to a * value that ensures the SCK frequency is 2MHz or less.) GETDATA PSHX PSHY PSHA LDX #$0 The X register is used as a pointer to the memory * locations that hold the conversion data LDY #$1000 * ******************************* * The next routine sends data to the * * LTC2408 an sets its MUX channel * ******************************* * LDAA $MUX Retrieve MUX address ORAA #$08 Set the MUX’s ENABLE bit STAA SPDR Transfer Accum. A contents to SPI register to initiate * serial transfer WAITMUX LDAA SPSR Get SPI transfer status BPL WAITMUX If the transfer is not finished, read status * *************************************** * Enable the LTC2408 * *************************************** * BCLR PORTD,Y %00100000 This sets the SS* output bit to a logic * low, selecting the LTC2408 * *************************************** * The next short loop waits for the * * LTC2408’s conversion to finish before * * starting the SPI data transfer * *************************************** * CONVEND LDAA PORTD Retrieve the contents of port D ANDA #%00000100 Look at bit 2 * Bit 2 = Hi; the LTC2408’s conversion is not * complete * Bit 2 = Lo; the LTC2408’s conversion is complete BNE CONVEND Branch to the loop’s beginning while bit 2 remains * high |
Similar Part No. - LTC2404CG |
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Similar Description - LTC2404CG |
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