LTC1196(Rev_0) 查看數據表（PDF） - Linear Technology

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LTC1196
(Rev.:Rev_0)

8-Bit, SO-8, 1MSPS ADCs with Auto-Shutdown Options

Linear Technology 

LTC1196/LTC1198

TYPICAL APPLICATI S

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.

MSB

XXXXXXXX 765432

DOUT FROM LTC1198 STORED IN TMS320C25 RAM

LSB

1 0 > 200

L1196/98 F19

Figure 19. Memory Map for the Circuit in Figure 15

LABEL

INIT

TXRX

RINT

MNEMONIC

AORG

0

B

INIT

AORG

>26

B

RINT

AORG

DINT

LDPK

LARP

LRLK

LACK

SACL

STXM

FORT

>32

>0

>1

AR1,>200

>10

>4

0

LACK

>44

SFSM

RPTK

7

SFL

SACL

>1

EINT

RPTK

2

NOP

ZALS

SACL

B

END

>0

*, 0

TXRX

COMMENTS

ON RESET CODE EXECUTION STARTS AT 0

BRANCH TO INITIALIZATION ROUTINE

ADDRESS OF RINT INTERRUPT VECTOR

BRANCH TO RINT SERVICE ROUTINE

MAIN PROGRAM STARTS HERE

DISABLE INTERRUPTS

SET DATA MEMORY PAGE POINTER TO 0

SET AUXILIARY REGISTER POINTER TO 1

SET AUXILIARY REGISTER 1 TO >200

LOAD IMR CONFIG WORD INTO ACC

STORE IMR CONFIG WORD INTO IMR

CONFIGURE FSX AS AN OUTPUT

SET SERIAL PORT TO 16-BIT MODE

LOAD LTC1198 DIN WORD INTO ACC

FSX PULSES GENERATED ON XSR LOAD

REPEAT NEXT INSTRUCTION 8 TIMES

SHIFTS DIN WORD TO RIGHT POSITION

PUT DIN WORD IN TRANSMIT REGISTER

ENABLE INTERRUPT (DISABLED ON RINT)

MINIMIZE THE CONVERSION CYCLE TIME

TO BE 20 CLOCK CYCLES

STORE LTC1198 DOUT WORD IN ACC

STORE ACC IN LOCATION >200

BRANCH TO TRANSMIT RECEIVE ROUTINE

Figure 20. TMS320C25 Code for the Circuit in Figure 15

26

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