LTC2415-1IGN datasheet(37/40 Pages) LINER

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LTC2415/LTC2415-1

sn2415 24151fs

TYPICAL APPLICATIO S

********************************************

* The next short loop waits for the

* LTC2415/LTC2415-1’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 LTC2415/LTC2415-1’s conversion is not

complete

Bit 2 = Lo; the LTC2415/LTC2415-1’s conversion is complete

BNE

CONVEND

Branch to the loop’s beginning while bit 2 remains

high

********************

* The SPI data transfer *

********************

TRFLP1

LDAA

#$0

Load accumulator A with a null byte for SPI transfer

STAA

SPDR

This writes the byte in the SPI data register and starts

the transfer

WAIT1

LDAA

SPSR

This loop waits for the SPI to complete a serial

transfer/exchange by reading the SPI Status Register

BPL

WAIT1

The SPIF (SPI transfer complete flag) bit is the SPSR’s MSB

and is set to one at the end of an SPI transfer. The branch

will occur while SPIF is a zero.

LDAA

SPDR

Load accumulator A with the current byte of LTC2415/LTC2415-1 data

that was just received

STAA

0,X

Transfer the LTC2415/LTC2415-1’s data to memory

INX

Increment the pointer

CPX

#DIN4+1 Has the last byte been transferred/exchanged?

BNE

TRFLP1

If the last byte has not been reached, then proceed to the

next byte for transfer/exchange

BSET

PORTD,Y %00100000 This sets the SS* output bit to a logic high,

de-selecting the LTC2415/LTC2415-1

PULA

Restore the A register

PULY

Restore the Y register

PULX

Restore the X register

RTS

Figure 38. This is an Example of 68HC11 Code That Captures the LTC2415/LTC2415-1

Conversion Results Over the SPI Serial Interface Shown in Figure 40

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