dsp56800 Freescale Semiconductor, Inc, dsp56800 Datasheet - Page 108
dsp56800
Manufacturer Part Number
dsp56800
Description
16-bit Digital Signal Controllers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.DSP56800.pdf
(448 pages)
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Address Generation Unit
The high-order two bits of the M01 register determine the arithmetic mode for R0 and R1. A value of 00
for M01[15:14] selects modulo arithmetic for R0. A value of 10 for M01[15:14] selects modulo arithmetic
for both R0 and R1. A value of 11 disables modulo arithmetic. The remaining 14 bits of M01 hold the size
of the buffer minus one.
4-28
The reserved values ($0000, $4000-$8000, and $C000-$FFFE) should not
be used. The behavior of the modulo arithmetic unit is undefined for these
values, and may result in erratic program execution.
Register Contents
Table 4-9. Programming M01 for Modulo Arithmetic (Continued)
16-Bit M01
$BFFE
$BFFF
$FFFE
$3FFE
$3FFF
$7FFF
$C000
$FFFF
$4000
$8000
$8001
$8002
...
...
...
...
DSP56800 Family Manual
Modulo 16383
Modulo 16384
(Reserved)
(Reserved)
(Reserved)
Modulo 2
Modulo 3
Modulo 16383
Modulo 16384
(Reserved)
(Reserved)
Linear Arithmetic
Address Arithmetic
Performed
NOTE:
...
...
...
...
R0 and R1 pointers
R0 pointer only
R0 pointer only
R0 and R1 pointers
R0 and R1 pointers
R0 and R1 pointers
R0 and R1 pointers both set
up for linear arithmetic
Pointer Registers
Affected
—
—
—
—
—
...
...
...
...
Freescale Semiconductor
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