Notes On Rewriting Port Mode Registers - Renesas H8/3847R Series Hardware Manual

Section 3 Exception Handling
3.4.2

Notes on Rewriting Port Mode Registers

When a port mode register is rewritten to switch the functions of external interrupt pins, the
following points should be observed.
When an external interrupt pin function is switched by rewriting the port mode register that
controls pins IRQ to IRQ , WKP to WKP
, the interrupt request flag may be set to 1 at the time
4 0 7 0
the pin function is switched, even if no valid interrupt is input at the pin. Be sure to clear the
interrupt request flag to 0 after switching pin functions. Table 3.5 shows the conditions under
which interrupt request flags are set to 1 in this way.
Rev. 6.00 Aug 04, 2006 page 115 of 680
REJ09B0145-0600