HD6473887 Datasheet, PDF (104/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

Figure 3-7 shows the procedure for setting a bit in a port mode register and clearing the interrupt
request flag.
When switching a pin function, mask the interrupt before setting the bit in the port mode register.
After accessing the port mode register, execute at least one instruction (e.g., NOP), then clear the
interrupt request flag from 1 to 0. If the instruction to clear the flag is executed immediately after
the port mode register access without executing an intervening instruction, the flag will not be
cleared.
An alternative method is to avoid the setting of interrupt request flags when pin functions are
switched by keeping the pins at the high level so that the conditions in table 3-5 do not occur.
CCR I bit ← 1
Set port mode register bit
Execute NOP instruction
Clear interrupt request flag to 0
Interrupts masked. (Another possibility
is to disable the relevant interrupt in
interrupt enable register 1.)
After setting the port mode register bit,
first execute at least one instruction
(e.g., NOP), then clear the interrupt
request flag to 0
CCR I bit ← 0
Interrupt mask cleared
Figure 3-7 Port Mode Register Setting and Interrupt Request Flag
Clearing Procedure
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