Interrupt Control Modes And Interrupt Operation; Figure 5.4 Block Diagram Of Interrupt Control Operation; Table 5.4 Interrupt Control Modes - Renesas H8S/2158 User Manual

Section 5 Interrupt Controller
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
Interrupt SYSCR
Control
Mode INTM1
0 0
1
Figure 5.4 shows a block diagram of the priority decision circuit.
Interrupt
source

Figure 5.4 Block Diagram of Interrupt Control Operation

Rev. 3.00 Jan 25, 2006 page 90 of 872
REJ09B0286-0300
Priority
Setting
INTM0 Registers
0 ICR
1 ICR
I
ICR
Interrupt
acceptance control
and 3-level mask
control
Interrupt control modes
0 and 1
Interrupt
Mask Bits Description
I Interrupt mask control is performed by
the I bit. Priority levels can be set with
ICR.
I, UI 3-level interrupt mask control is
performed by the I bit. Priority levels
can be set with ICR.
UI
Default priority
determination
Vector
number