LTC1196 datasheet(26/28 Pages) LINER

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LTC1196/LTC1198

APPLICATI

TYPICAL

Once RINT is generated the code begins execution at the

label RINT. This code stores the DOUT word from the

LTC1198 in the ACC and then stores it in location 200 hex.

The data appears in location 200 hex right-justified as

shown in Figure 19. The code is set up to continually loop,

so at this point the code jumps to label TXRX and repeats

from here.

L1196/98 F19

MSB

LSB

DOUT FROM LTC1198 STORED IN TMS320C25 RAM

> 200

Figure 19. Memory Map for the Circuit in Figure 15

LABEL

MNEMONIC

COMMENTS

AORG

ON RESET CODE EXECUTION STARTS AT 0

INIT

BRANCH TO INITIALIZATION ROUTINE

AORG

>26

ADDRESS OF RINT INTERRUPT VECTOR

RINT

BRANCH TO RINT SERVICE ROUTINE

AORG

>32

MAIN PROGRAM STARTS HERE

INIT

DINT

DISABLE INTERRUPTS

LDPK

SET DATA MEMORY PAGE POINTER TO 0

LARP

SET AUXILIARY REGISTER POINTER TO 1

LRLK

AR1,>200

SET AUXILIARY REGISTER 1 TO >200

LACK

>10

LOAD IMR CONFIG WORD INTO ACC

SACL

STORE IMR CONFIG WORD INTO IMR

STXM

CONFIGURE FSX AS AN OUTPUT

FORT

SET SERIAL PORT TO 16-BIT MODE

TXRX

LACK

>44

LOAD LTC1198 DIN WORD INTO ACC

SFSM

FSX PULSES GENERATED ON XSR LOAD

RPTK

REPEAT NEXT INSTRUCTION 8 TIMES

SFL

SHIFTS DIN WORD TO RIGHT POSITION

SACL

PUT DIN WORD IN TRANSMIT REGISTER

EINT

ENABLE INTERRUPT (DISABLED ON RINT)

RPTK

MINIMIZE THE CONVERSION CYCLE TIME

NOP

TO BE 20 CLOCK CYCLES

RINT

ZALS

STORE LTC1198 DOUT WORD IN ACC

SACL

*, 0

STORE ACC IN LOCATION >200

TXRX

BRANCH TO TRANSMIT RECEIVE ROUTINE

END

Figure 20. TMS320C25 Code for the Circuit in Figure 15

LTC1196 Datasheet(PDF) 26 Page - Linear Technology

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