HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 159

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Figure 5.4 shows a block diagram of the priority decision circuit.
(1) Interrupt Acceptance Control and 3-Level Control
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 5.6 shows the interrupts selected in each interrupt control mode.
Table 5.6
Legend:
*: Don't care
Interrupt Control Mode
0
1
Interrupts Selected in Each Interrupt Control Mode
Interrupt
source
Figure 5.4 Block Diagram of Interrupt Control Operation
I
0
1
0
1
Interrupt control modes
3-level mask control
Interrupt acceptance
Interrupt Mask Bits
ICR
control and
0 and 1
I
UI
*
*
*
0
1
UI
Selected Interrupts
All interrupts (control level 1 has priority)
NMI interrupts
All interrupts (control level 1 has priority)
NMI and control level 1 interrupts
NMI interrupts
Default priority
determination
Rev.3.00 Mar. 26, 2007 Page 117 of 772
Section 5 Interrupt Controller
Vector
number
REJ09B0355-0300