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2010 Microchip Technology Inc.
DS70141F-page 41
dsPIC30F3010/3011
4.2.1
START AND END ADDRESS
The Modulo Addressing scheme requires that a
starting and an end address be specified and loaded
into the 16-bit Modulo Buffer Address registers:
XMODSRT, XMODEND, YMODSRT and YMODEND
(see Table 3-3).
The length of a circular buffer is not directly specified. It
is
determined
by
the
difference
between
the
corresponding start and end addresses. The maximum
possible length of the circular buffer is 32K words
(64 Kbytes).
4.2.2
W ADDRESS REGISTER
SELECTION
The Modulo and Bit-Reversed Addressing Control
register 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
are 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>, as shown in Table 3-3. Modulo
Addressing is enabled for X data space when XWM is
set to any value other than 15 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 15
and the YMODEN bit is set at MODCON<14>.
FIGURE 4-1:
MODULO ADDRESSING OPERATION EXAMPLE
Note:
Y-space Modulo Addressing EA calcula-
tions assume word-sized data (LSb of
every EA is always clear).
0x1100
0x1163
Start Addr = 0x1100
End Addr = 0x1163
Length = 0x0032 words
Byte
Address
MOV
#0x1100,W0
MOV
W0, XMODSRT
;set modulo start address
MOV
#0x1163,W0
MOV
W0,MODEND
;set modulo end address
MOV
#0x8001,W0
MOV
W0,MODCON
;enable W1, X AGU for modulo
MOV
#0x0000,W0
;W0 holds buffer fill value
MOV
#0x1110,W1
;point W1 to buffer
DO
AGAIN,#0x31
;fill the 50 buffer locations
MOV
W0, [W1++]
;fill the next location
AGAIN:
INC
W0,W0
;increment the fill value
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