HD64F3664BPV Datasheet, PDF (95/446 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

Section 3 Exception Handling
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 3.4 Port Mode Register Setting and Interrupt Request Flag Clearing Procedure
Rev. 6.00 Mar. 24, 2006 Page 65 of 412
REJ09B0142-0600