3820_03 Datasheet, PDF (118/349 Pages) Renesas Technology Corp – 8-BIT SINGLE-CHIP MICROCOMPUTER

APPLICATION
2.2 Interrupts
2.2.6 Notes on use
When using interrupts, note the following.
(1) Register setting
sFix bit 7 of the interrupt control register 2 (address 003F16) to “0.” Nothing is allocated for this bit,
however, do not write “1” to it.
sWhen using I/O ports P42, P43, P57 and P60 as input ports, put the INT interrupts corresponding to
each port into the disabled state.
sWhen the active edges of the following interrupts are switched, the corresponding interrupt request
bit may be set to “1.” To avoid accepting an interrupt request, we recommend the register setting
example shown in Figure 2.2.17.
qINT0 interrupt to INT3 interrupt
qCNTR0 interrupt and CNTR1 interrupt
Œ ^{Set the corresponding interrupt enable bit to “0”}
 Set the interrupt active edge
Ž ^{Set the corresponding interrupt request bit to “0”}
 ^{Set the corresponding interrupt enable bit to “1”}
Fig. 2.2.17 Register setting example
3820 GROUP USER’S MANUAL
2–31