M16C1N Datasheet, PDF (220/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
20. Precautionary Notes in Using the Device
When an instruction to rewrite the interrupt control register is executed while the interrupt is dis-
abled, depending on the instruction used for rewriting, there are times the interrupt request bit is
not set even if an interrupt request for that register has been generated. If this creates a problem,
please use any of the instructions below to rewrite the register.
Instructions : AND, OR, BCLR, BSET
20.2.5 Changing the interrupt request bit
When attempting to clear the interrupt request bit of an interrupt control register, the interrupt
request bit is not cleared sometimes. This will depend on the instruction. If this creates problems,
use the below instructions to change the register.
Instructions : MOV
Rev.1.00 Oct 20, 2004 page 208 of 222
REJ090007-0100Z