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DSPIC30F6011AT-20E/S Datasheet

  • DSPIC30F6011AT-20E/S

  • High Performance Digital Signal Controllers

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  • MICROCHIP   MICROCHIP

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dsPIC30F6011/6012/6013/6014
4.2.1
START AND END ADDRESS
4.2.2
The modulo addressing scheme requires that a starting
and an ending address be specified and loaded into the
16-bit Modulo Buffer Address registers: XMODSRT,
XMODEND, YMODSRT, YMODEND (see Table 3-3).
Note:
Y space modulo addressing EA calcula-
tions assume word sized data (LS bit of
every EA is always clear).
W ADDRESS REGISTER
SELECTION
The length of a circular buffer is not directly specified. It
is determined by the difference between the corre-
sponding start and end addresses. The maximum pos-
sible length of the circular buffer is 32K words
(64 Kbytes).
The Modulo and Bit-Reversed Addressing Control reg-
ister MODCON<15:0> contains enable flags as well as
a W register field to specify the W address registers.
The XWM and YWM fields select which registers will
operate with modulo addressing. If XWM =
15,
X
RAGU and X WAGU modulo addressing is disabled.
Similarly, if YWM =
15,
Y AGU modulo addressing is
disabled.
The X Address Space Pointer W register (XWM), to
which modulo addressing is to be applied, is stored in
MODCON<3:0> (see Table 3-3). Modulo addressing is
enabled for X data space when XWM is set to any value
other than 鈥?5鈥?and the XMODEN bit is set at
MODCON<15>.
The Y Address Space Pointer W register (YWM), to
which modulo addressing is to be applied, is stored in
MODCON<7:4>. Modulo addressing is enabled for Y
data space when YWM is set to any value other than
鈥?5鈥?and the YMODEN bit is set at MODCON<14>.
FIGURE 4-1:
Byte
Address
MODULO ADDRESSING OPERATION EXAMPLE
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
#0x1100,W0
W0,XMODSRT
#0x1163,W0
W0,MODEND
#0x8001,W0
W0,MODCON
#0x0000,W0
#0x1110,W1
;set modulo start address
;set modulo end address
;enable W1, X AGU for modulo
;W0 holds buffer fill value
;point W1 to buffer
;fill the 50 buffer locations
;fill the next location
;increment the fill value
0x1100
DO
AGAIN,#0x31
MOV
W0,[W1++]
AGAIN: INC W0,W0
0x1163
Start Addr =
0x1100
End Addr =
0x1163
Length =
0x0032
words
铮?/div>
2004 Microchip Technology Inc.
Preliminary
DS70117C-page 39

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