Motorola DSP56301 ユーザーズマニュアル
Programming Sheets
Programming Reference
B
-13
B.3
Programming Sheets
Figure B-1. Status Register (SR)
Application:
Date:
Programmer:
Sheet 1 of 2
Central Processor
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
U
Z
V
C
19 18 17 16
23 22 21 20
L
LF
S1
SM
I1
I0
CE
SA
FV
S0
N
Scaling Mode
S(1:0)
Scaling Mode
00
01
10
11
01
10
11
No scaling
Scale down
Scale up
Reserved
Scale down
Scale up
Reserved
*
0
*
0
Interrupt Mask
I(1:0)
Exceptions Masked
00
01
10
11
01
10
11
None
IPL 0
IPL 0, 1
IPL 0, 1, 2
IPL 0
IPL 0, 1
IPL 0, 1, 2
Carry
Overflow
Zero
Negative
Overflow
Zero
Negative
Unnormalized ( U = Acc(47) xnor Acc(46) )
Extension
Limit
FFT Scaling ( S = Acc(46) xor Acc(45) )
Extension
Limit
FFT Scaling ( S = Acc(46) xor Acc(45) )
Sixteen-Bit Compatibilitity
Double Precision Multiply Mode
Loop Flag
Double Precision Multiply Mode
Loop Flag
DO-Forever Flag
Sixteen-Bit Arithmetic
Sixteen-Bit Arithmetic
Instruction Cache Enable
Arithmetic Saturation
Rounding Mode
Arithmetic Saturation
Rounding Mode
Core Priority
CP(1:0)
Core Priority
00
01
10
11
01
10
11
0 (lowest)
1
2
3 (highest)
1
2
3 (highest)
*
= Reserved, Program as 0
Mode Register (MR)
Condition Code Register (CCR)
Extended Mode Register (EMR)
Status Register (SR)
Read/Write
Reset = $C00300
CP1
CP0
RM
DM
SC
S
E