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Programming Sheets
B.3
Programming Sheets
Application:
Central Processor
Unnormalized ( U = Acc(47) xnor Acc(46) )
Extension
Limit
FFT Scaling ( S = Acc(46) xor Acc(45) )
Scaling Mode
S(1:0)
Scaling Mode
00
No scaling
01
Scale down
10
Scale up
11
Reserved
Sixteen-Bit Compatibilitity
Double Precision Multiply Mode
Loop Flag
DO-Forever Flag
Sixteen-Bit Arithmetic
Instruction Cache Enable
Arithmetic Saturation
Rounding Mode
Core Priority
CP(1:0)
Core Priority
00
0 (lowest)
01
1
10
2
11
3 (highest)
23 22 21 20
19 18 17 16
CP1
CP0
RM
SM
CE
Extended Mode Register (EMR)
Status Register (SR)
Reset = $C00300
B-12
Interrupt Mask
I(1:0)
Exceptions Masked
00
None
01
IPL 0
10
IPL 0, 1
11
IPL 0, 1, 2
15 14 13 12 11 10 9
*
SA
FV
LF
DM
SC
0
Mode Register (MR)
Read/Write
Figure B-1. Status Register (SR)
DSP56303 User's Manual
Carry
Overflow
Zero
Negative
8
7
*
S1
S0
I1
I0
S
0
Condition Code Register (CCR)
Date:
Programmer:
Sheet 1 of 2
6
5
4
3
2
1
L
E
U
N
Z
V
*
= Reserved, Program as 0
0
C
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