H8S68 Datasheet, PDF (178/1044 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip MicrocomputerH8S Family/H8S/2300 Series

Section 5 Interrupt Controller
5.7.6 Note on IRQ Status Register (ISR)
Since IRQnF flags may be set to 1 depending on the pin states after a reset, be sure to read from
ISR after a reset and then write 0 to clear the IRQnF flags.
Rev.6.00 Mar. 18, 2009 Page 118 of 980
REJ09B0050-0600