356 AMCC Proprietary
Revision 1.02 - September 10, 2007
PPC405 Processor
Preliminary User’s Manual
10.7 Device Control Registers
DCRs may be used to control various on-chip system functions, such as the operation of on-chip buses,
peripherals, and certain processor function behaviors. The DCR access instructions are mtdcr (move to device
control register) and mfdcr (move from device control register), which move data between GPRs and the DCRs.
Some DCRs are directly accessed, that is, they are accessed using their DCR numbers. Other DCRs are indirectly
accessed. Such DCRs are accessed by writing an offset to a directly accessed DCR and then reading the data at
the offset in another directly accessed DCR.
DCRs are unique to the chip in which this processor is instantiated and are not a part of the processor. Refer to the
appropriate chip user’s manual for details on the DCRs.
Table 10-4. Time Base Registers
Mnemonic Register Name
TBRN
TBRF Access
Decimal Hex
TBL Time Base Lower (Read-only) 268 0x10C 0x188 Read-only
TBU Time Base Upper (Read-only) 269 0x10D 0x1A8 Read-only
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