LTC1594CS datasheet(20/24 Pages) LINER

20 / 24 page

LTC1594/LTC1598

15948fb

TYPICAL APPLICATIONS N

LDA #$52

Configuration data for serial peripheral

control register (Interrupts disabled, output

enabled, master, Norm = 0, Ph = 0, Clk/16)

STA $0A

Load configuration data into location $0A (SPCR)

LDA #$FF

Configuration data for I/O ports

(all bits are set as outputs)

STA $04

Load configuration data into Port A DDR ($04)

STA $05

Load configuration data into Port B DDR ($05)

STA $06

Load configuration data into Port C DDR ($06)

LDA #$08

Put DIN word for LTC1598 into Accumulator

(CH0 with respect to GND)

STA $50

Load DIN word into memory location $50

START BSET 0,$02

Bit 0 Port C ($02) goes high (CS goes high)

LDA $50

Load DIN word at $50 into Accumulator

STA $0C

Load DIN word into SPI data register ($0C) and

start clocking data

LOOP1 TST $0B

Test status of SPIF bit in SPI status register ($0B)

MC68HC05 CODE

BPL LOOP1 Loop if not done with transfer to previous instruction

BCLR 0,$02

Bit 0 Port C ($02) goes low (CS goes low)

LDA $0C

Load contents of SPI data register into Accumulator

STA $0C

Start next SPI cycle

LOOP2 TST $0B

Test status of SPIF

BPL LOOP2 Loop if not done

LDA $0C

Load contents of SPI data register into Accumulator

STA $0C

Start next SPI cycle

AND #$IF

Clear 3 MSBs of first DOUT word

STA $00

Load Port A ($00) with MSBs

LOOP3 TST $0B

Test status of SPIF

BPL LOOP3 Loop if not done

LDA $0C

Load contents of SPI data register into Accumulator

AND #$FE

Clear LSB of second DOUT word

STA $01

Load Port B ($01) with LSBs

JMP START Go back to start and repeat program

1594/98 TA04

DOUT FROM LTC1598 STORED IN MC68HC05 RAM

LSB

MSB

#00

#01

B11

B10

CLK

DIN

CSMUX

CSADC

ANALOG

INPUTS

SCK

MC68HC05

DOUT

MOSI

LTC1598

BYTE 1

BYTE 2

MISO

Hardware and Software Interface to Motorola MC68HC05

Data Exchange Between LTC1598 and MC68HC05

CSMUX

= CSADC

= CS

CLK

DOUT

MPU

RECEIVED

WORD

1594/98 TA03

B11

B10

DIN

MPU

TRANSMIT

WORD

BYTE 3

BYTE 2

0D1

BYTE 1

BYTE 3

BYTE 2

BYTE 1

B10

B11

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