h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 141

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

8-Level Control: In interrupt control mode 2, 8-level mask level determination is performed for
the selected interrupts in interrupt acceptance control according to the interrupt priority level
(IPR).
The interrupt source selected is the interrupt with the highest priority level, and whose priority
level set in IPR is higher than the mask level.
Table 5.7
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
Legend:
Notes: 1. Set to 1 when interrupt is accepted.
Interrupt Control Mode
0
2
PR : Sets priority.
IM : Used as interrupt mask bit
— : Not used.
X : No operation. (All interrupts enabled)
Interrupt
Control
Mode
: Interrupt operation control performed
0
2
2. Keep the initial setting.
INTM1
Interrupts Selected in Each Interrupt Control Mode (2)
Operations and Control Signal Functions in Each Interrupt Control Mode
0
1
Setting
INTM0
0
0
Interrupt Acceptance
Selected Interrupts
All interrupts
Highest-priority-level (IPR) interrupt whose priority level is greater
than the mask level (IPR > I2 to I0).
X
Control
— *
IM
I
1
X
8-Level Control
Rev. 5.00 Sep 22, 2005 page 115 of 1136
I2 to I0
IM
—
— *
IPR
PR
Section 5 Interrupt Controller
2
Default Priority
Determination
REJ09B0257-0500
(Trace)
—
T
T