Control Registers - Freescale Semiconductor PowerPC MPC823 Reference Manual

The PowerPC Core

6.4.1 Control Registers

The following tables describe the core control registers, also known as special-purpose
registers, implemented within the MPC823.
Table 6-7. Standard Special-Purpose Registers
SPR
DECIMAL SPR
5:9
1 00000
8 00000
9 00000
18 00000
19 00000
22 00000
26 00000
27 00000
272 01000
273 01000
274 01000
275 01000
287 01000
Table 6-8. Standard Timebase Register Mapping
SPR
DECIMAL SPR
5:9
268 01000
269 01000
284 01000
285 01000
NOTES: 1. Extended opcode for mftb, 371 rather then 339.
2. Any write (mtspr) to this address results in an implementation-dependent software emulation interrupt.
3. Any read (mftb) to this address results in an implementation-dependent software emulation interrupt.
Freescale Semiconductor, Inc.
REGISTER
NAME
SPR
0:4
00001 XER
01000 LR
01001 CTR
10010 DSISR
10011 DAR
10110 DEC
11010 SRR0
11011 SRR1
10000 SPRG0
10001 SPRG1
10010 SPRG2
10011 SPRG3
11111 PVR
REGISTER
NAME
SPR
0:4
01100
TBL Read
01101
TBU Read
11100
TBL Write
11101
TBU Write
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PRIVILEGED SERIALIZE ACCESS
No Write:
Read:
No
No
Yes Write:
Read:
Yes Write:
Read:
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes No (Read-Only Register)
PRIVILEGED SERIALIZE ACCESS
2
No
2
No
3
Yes
3
Yes
Full Sync
Sync Relative to Load/
Store Operations
No
No
Full Sync
Sync Relative to Load/
Store Operations
Full Sync
Sync Relative to Load/
Store Operations
Write
Write
Write
Write
Write
Write
Write
Write - As a Store
Write - As a Store
Write - As a Store
Write - As a Store
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