HD64F2638F20J Datasheet, PDF (173/1512 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

H8S/2639, H8S/2638, H8S/2636,
H8S/2630, H8S/2635 Group
Section 5 Interrupt Controller
(3) Default Priority Determination
When an interrupt is selected by 8-level control, its priority is determined and a vector number is
generated.
If the same value is set for IPR, 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.
Table 5-8 shows operations and control signal functions in each interrupt control mode.
Table 5-8 Operations and Control Signal Functions in Each Interrupt Control Mode
Interrupt
Control
Setting
Interrupt Acceptance
Control
Mode INTM1 INTM0
I
0
0
0
IM
2
1
0
X
—^*1
Legend:
: Interrupt operation control performed
X: No operation (All interrupts enabled).
IM: Used as interrupt mask bit
PR: Sets priority.
—: Not used.
Notes: 1. Set to 1 when interrupt is accepted.
2. Keep the initial setting.
8-Level Control
I2 to I0 IPR
X
— —^*2
IM PR
Default Priority
T
Determination (Trace)
—
T
REJ09B0103-0800 Rev. 8.00
May 28, 2010
Page 123 of 1458