HD64F3048F16 Datasheet, PDF (133/903 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 5 Interrupt Controller
5.3 Interrupt Sources
The interrupt sources include external interrupts (NMI, IRQ₀ to IRQ₅) and 30 internal interrupts.
5.3.1 External Interrupts
There are seven external interrupts: NMI, and IRQ₀ to IRQ₅. Of these, NMI, IRQ₀, IRQ₁, and IRQ₂
can be used to exit software standby mode.
NMI
NMI is the highest-priority interrupt and is always accepted, regardless of the states of the I and UI
bits in CCR. The NMIEG bit in SYSCR selects whether an interrupt is requested by the rising or
falling edge of the input at the NMI pin*. NMI interrupt exception handling has vector number 7.
Note: * For the H8/3048F-ONE (single power supply with flash memory), the NMI input may
be prohibited. For details, refer to section 18.8.4, NMI Input Disable Conditions.
IRQ₀ to IRQ₅ Interrupts
These interrupts are requested by input signals at pins IRQ₀ to IRQ₅. The IRQ₀ to IRQ₅ interrupts
have the following features.
• ISCR settings can select whether an interrupt is requested by the low level of the input at pins
IRQ₀ to IRQ₅, or by the falling edge.
• IER settings can enable or disable the IRQ₀ to IRQ₅ interrupts. Interrupt priority levels can be
assigned by four bits in IPRA (IPRA7 to IPRA4).
• The status of IRQ₀ to IRQ₅ interrupt requests is indicated in ISR. The ISR flags can be cleared
to 0 by software.
Figure 5.2 shows a block diagram of interrupts IRQ₀ to IRQ₅.
Rev. 3.00 Sep 27, 2006 page 105 of 872
REJ09B0325-0300