Renesas H8S/2100 Series Hardware Manual page 158

Section 6 Interrupt Controller
(1) Interrupt Acceptance Control and 3-Level Control
In interrupt control modes 0 and 1, interrupt acceptance control and 3-level mask control is
performed by means of the I and UI bits in CCR and ICR (control level).
Table 6.8 shows the interrupts selected in each interrupt control mode.
Table 6.8 Interrupts Selected in Each Interrupt Control Mode
Interrupt Control Mode I
0
1
[Legend]
*: Don't care
(2) Default Priority Determination
The priority is determined for the selected interrupt, and a vector number is generated.
If the same value is set for ICR, acceptance of multiple interrupts is enabled, and so only the
interrupt source with the highest priority according to the preset default priorities is selected and
has a vector number generated.
Interrupt sources with a lower priority than the accepted interrupt source are held pending.
Rev. 1.00 May 09, 2008 Page 132 of 954
REJ09B0462-0100
Interrupt Mask Bits
UI
0
*
1 *
0
*
1 0
1
Selected Interrupts
All interrupts (interrupt control level 1 has
priority)
NMI and address break interrupts
All interrupts (interrupt control level 1 has
priority)
NMI, address break, and interrupt control level 1
interrupts
NMI and address break interrupts