AMCC Proprietary 33
Revision 1.02 - September 10, 2007
PPC405 Processor
Preliminary User’s Manual
Programming Note: Programming Note: A good coding practice is to perform the initial write to a register
with reserved fields as described, and to perform all subsequent writes to the register using a read-modify-
write strategy: read the register, use logical instructions to alter defined fields, leaving reserved fields
unmodified, and write the register.
Figure 2-1 illustrates the registers in the user and supervisor programming models.
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