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Compilation Systems Volume 1 (Tools) Special-Purpose Registers 3 Table 3-5. Special-Purpose Registers Number 3-28 Name Description 0 MQ Multiply-Quotient Register (601 only) 1 XER Fixed-Point Exception Register 4 RTCU Real Time Clock Upper (read only) (601 only) 5 RTCL Real Time Clock Lower (read only) (601 only) 6 DEC Decrementer (601 only) This is identical to Special Register 22. 8 LR Link Register 9 CTR Count Register 18 DSISR Data Storage Interrupt Status Register 19 DAR Data Address Register 20 RTCU Real Time Clock Upper (write only) (601 only) 21 RTCL Real Time Clock Lower (write only) (601 only) 22 DEC Decrementer 25 SDR1 Storage Description Register 1 26 SRR0 Save/Restore Register 0 27 SRR1 Save/Restore Register 1 272 SPRG0 Special Purpose Register General 0 273 SPRG1 Special Purpose Register General 1 274 SPRG2 Special Purpose Register General 2 275 SPRG3 Special Purpose Register General 3 280 ASR Address Space Register (620 only) 282 EAR External Access Register (optional) (not on 602) 284 TBL Time Base Lower (dest only) (not on 601) 285 TBU Time Base Upper (dest only) (not on 601,64-bit) 287 PVR Processor Version Register (src only) 528 IBAT0U Instruction Block Address Translation 0 Upper 529 IBAT0L Instruction Block Address Translation 0 Lower 530 IBAT1U Instruction Block Address Translation 1 Upper 531 IBAT1L Instruction Block Address Translation 1 Lower 532 IBAT2U Instruction Block Address Translation 2 Upper 533 IBAT2L Instruction Block Address Translation 2 Lower
