H8SLASH3021 datasheet(116/712 Pages) RENESAS

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5. Interrupt Controller

Rev.2.00 Mar. 22, 2007 Page 92 of 684

REJ09B0352-0200

5.3

Interrupt Sources

The interrupt sources include external interrupts (NMI, IRQ

5, IRQ4, IRQ1 and IRQ0) and 25

internal interrupts.

5.3.1

External Interrupts

There are five external interrupts: NMI, and IRQ

5, IRQ4, IRQ1, and IRQ0. Of these, NMI, IRQ0,

IRQ

1, 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.

IRQ

5, IRQ4, IRQ1, IRQ0 Interrupts: These interrupts are requested by input signals at pins IRQ5,

IRQ

4, IRQ1, IRQ0. The IRQ5, IRQ4, IRQ1, IRQ0 interrupts have the following features.

• ISCR settings can select whether an interrupt is requested by the low level of the input at pins

IRQ

5, IRQ4, IRQ1, IRQ0, or by the falling edge.

• IER settings can enable or disable the IRQ

5, IRQ4, IRQ1, IRQ0 interrupts.

Interrupt priority levels can be assigned by three bits in IPRA (IPRA7, IPRA6, and IPRA4).

• The status of IRQ

5, IRQ4, IRQ1, IRQ0 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 IRQ

5, IRQ4, IRQ1, IRQ0.

input

Edge/level

sense circuit

IRQnSC

IRQnF

IRQnE

IRQn interrupt

request

Clear signal

IRQn

Note: n = 5, 4, 1 and 0

Figure 5.2 Block Diagram of Interrupts IRQ

5, IRQ4, IRQ1, and IRQ0

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