Section 5 Interrupt Controller
Rev. 3.00 Jan 25, 2006 page 90 of 872
REJ09B0286-0300
5.6
Interrupt Control Modes and Interrupt Operation
The interrupt controller has two modes: Interrupt control mode 0 and interrupt control mode 1.
Interrupt operations differ depending on the interrupt control mode. NMI interrupts and address
break interrupts are always accepted except for in reset state or in hardware standby mode. The
interrupt control mode is selected by SYSCR. Table 5.4 shows the interrupt control modes.
Table 5.4
Interrupt Control Modes
SYSCR
Interrupt
Control
Mode
INTM1
INTM0
Priority
Setting
Registers
Interrupt
Mask Bits
Description
0
0
0
ICR
I
Interrupt mask control is performed by
the I bit. Priority levels can be set with
ICR.
1
1
ICR
I, UI
3-level interrupt mask control is
performed by the I bit. Priority levels
can be set with ICR.
Figure 5.4 shows a block diagram of the priority decision circuit.
ICR
UI
I
Default priority
determination
Vector
number
Interrupt
acceptance control
and 3-level mask
control
Interrupt
source
Interrupt control modes
0 and 1
Figure 5.4 Block Diagram of Interrupt Control Operation
Содержание H8S/2158
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Страница 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Страница 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Страница 744: ...Section 20 Encryption Operation Circuit DES and GF Rev 3 00 Jan 25 2006 page 690 of 872 REJ09B0286 0300...
Страница 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Страница 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Страница 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
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Страница 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...