HD6473847RHV Datasheet, PDF (124/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 3 Exception Handling
Figure 3.4 shows a port mode register setting and interrupt request flag clearing procedure.
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. 7.00 Mar. 08, 2010 Page 92 of 510
REJ09B0024-0700