Central Processing Unit
MPC561/MPC563 Reference Manual, Rev. 1.2
3-22
Freescale Semiconductor
The floating-point exception mode bits are interpreted as shown in
3.9.2
DAE/Source Instruction Service Register (DSISR)
The DSISR, SPR 18, identifies the cause of data access and alignment exceptions.
For more information about bit settings, see
Section 3.15.4.2, “Machine Check Exception (0x0200)
,”
Section 3.15.4.6, “Alignment Exception (0x00600)
Section 3.15.4.15, “Implementation-Specific
Data Protection Error Exception (0x1400)
27
DR
Data relocation.
0 Data address translation is off; the L2U DMPU does not check for address permission
attributes.
1 Data address translation is on; the L2U DMPU checks for addressn permission attributes.
28
—
Reserved
29
DCMPEN Decompression On/Off. The reset value of this bit is (BBCMCR[EN_COMP] AND
BBCMCR[EXC_COMP]).
Note:
This bit should not be set for the MPC561/MPC563.
0 The RCPU runs in normal operation mode.
1 The RCPU runs in compressed mode.
Note:
MSR[DCMPEN] should not be changed by software by a direct MSR register write
(MTMSR instruction). It can be changed only by the RFI instruction or by an exception.
30
RI
Recoverable exception (for machine check and non-maskable breakpoint exceptions).
0 Machine state is not recoverable.
1 Machine state is recoverable.
31
LE
Little-endian mode. This mode is not supported on MPC561/MPC563. This bit should be
cleared to 0 at all times.
0 The processor operates in big-endian mode during normal processing.
1 The processor operates in little-endian mode during normal processing.
Table 3-12. Floating-Point Exception Mode Bits
FE[0:1]
Mode
00
Ignore exceptions mode. Floating-point exceptions do not cause the
floating-point assist error handler to be invoked.
01, 10, 11
Floating-point precise mode. The system floating-point assist error
handler is invoked precisely at the instruction that caused the enabled
exception.
MSB
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
LSB
31
Field
DSISR
Reset
Unchanged
Addr
SPR 18
Figure 3-12. DAE/Source Instruction Service Register (DSISR)
Table 3-11. Machine State Register Bit Descriptions (continued)
Bits
Name
Description
Summary of Contents for MPC561
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