h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 133

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

5.3
Interrupt sources comprise external interrupts (NMI and IRQ5 to IRQ0) and internal interrupts * .
Note: * 47 sources in the H8S/2648, H8S/2648R, and H8S/2647.
5.3.1
There are seven external interrupts: NMI and IRQ5 to IRQ0. Of these, NMI and IRQ5 to IRQ0
can be used to restore the H8S/2646 Group from software standby mode.
NMI Interrupt: NMI is the highest-priority interrupt, and is always accepted by the CPU
regardless of the interrupt control mode or the status of the CPU interrupt mask bits. The NMIEG
bit in SYSCR can be used to select whether an interrupt is requested at a rising edge or a falling
edge on the NMI pin.
The vector number for NMI interrupt exception handling is 7.
IRQ5 to IRQ0 Interrupts: Interrupts IRQ5 to IRQ0 are requested by an input signal at pins IRQ5
to IRQ0. Interrupts IRQ5 to IRQ0 have the following features:
• Using ISCR, it is possible to select whether an interrupt is generated by a low level, falling
• Enabling or disabling of interrupt requests IRQ5 to IRQ0 can be selected with IER.
• The interrupt priority level can be set with IPR.
• The status of interrupt requests IRQ5 to IRQ0 is indicated in ISR. ISR flags can be cleared to 0
A block diagram of interrupts IRQ5 to IRQ0 is shown in figure 5.2.
edge, rising edge, or both edges, at pins IRQ5 to IRQ0.
by software.
43 sources in the H8S/2646, H8S/2646R, and H8S/2645.
Interrupt Sources
External Interrupts
Rev. 5.00 Sep 22, 2005 page 107 of 1136
Section 5 Interrupt Controller
REJ09B0257-0500