Motorola DSP56156 Manual page 43

31
X1
15 0 15
15
15
15
R0
R1
R2
R3
POINTER
REGISTERS
15
LOOP ADDRESS
REGISTER (LA)
15
COUNTER (PC)
31
1 - 22
PROGRAMMING MODEL
DATA ARITHMETIC LOGIC UNIT
DATA ALU
INPUT REGISTERS
X
0
X0
0
ACCUMULATOR REGISTERS
39
#
A2
8 7 0 15
39
#
B2
8 7 0 15 0
ADDRESS GENERATION UNIT
0 15
OFFSET
REGISTERS
PROGRAM CONTROL UNIT
15
0
LOOP COUNTER (LC)
0 15
MR
STATUS
PROGRAM
REGISTER (SR)
SSH 16 15 SSL
SYSTEM STACK
Figure 1-10 DSP56156 Programming Model
DSP56156 OVERVIEW
31
Y1
15
A
A0
A1
0 15
B
B0
B1
15 0
0 15
N0
N1
N2
N3
0
8 7 0
CCR
0
1
*
RESERVED – WRITTEN AS ZERO, READ AS ZERO
# READ AS SIGN EXTENSION BITS,
WRITTEN AS DON'T CARE
15
Y
0
Y0
0 15 0
0
0
0
0
M0
M1
M2
M3
MODIFIER
REGISTERS
15 8 7 6 5 4 3 2 1 0
CD SD R SA MC MB MA
* *
OPERATING MODE
REGISTER (OMR)
15 6 5 0
STACK POINTER (SP)
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