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DSPIC30F Datasheet(PDF) 54 Page - Microchip Technology

Part # DSPIC30F
Description  General Purpose and Sensor Families High-Performance Digital Signal Controllers
PDF  248 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

DSPIC30F Datasheet(HTML) 54 Page - Microchip Technology

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dsPIC30F
DS70083G-page 52
Preliminary
 2004 Microchip Technology Inc.
FIGURE 4-2:
DECREMENTING BUFFER MODULO ADDRESSING OPERATION EXAMPLE
0x11D0
0x11FF
Start Addr = 0x11D0
End Addr = 0x11FF
Length = 0x0018 words
Byte
Address
MOV
#0x11D0,W0
MOV
#0,XMODSRT
;set modulo start address
MOV
0x11FF,W0
MOV
W0,XMODEND
;set modulo end address
MOV
#0x8001,W0
MOV
W0,MODCON
;enable W1, X AGU for modulo
MOV
#0x000F,W0
;W0 holds buffer fill value
MOV
#0x11E0,W1
;point W1 to buffer
DO
AGAIN,#0x17
;fill the 24 buffer locations
MOV
W0,[W1--]
;fill the next location
AGAIN: DEC
W0,W0
; decrement the fill value



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