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Programming Model 2-3
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 on page 2-4 illustrates the registers in the user and supervisor programming models.