HD6433713 datasheet(67/324 Pages) RENESAS

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Figure 3-1 Reset Sequence

3.2.2 Interrupts

The interrupt sources include external interrupts (IRQ5, IRQ4, IRQ1, IRQ0), and internal interrupts

requested from on-chip peripheral modules. Table 3-2 shows the interrupt sources, their priorities,

and their vector addresses. When more than one interrupt is requested, the interrupt with the

highest priority is processed.

The interrupts have the following features.

•

Both internal interrupts and external interrupts (IRQ5, IRQ4, IRQ1, IRQ0), can be masked by

the I bit of CCR. When this bit is set to 1, interrupt request flags are set but interrupts are not

accepted.

•

External interrupt pins IRQ4, IRQ1, and IRQ0 can be set independently for rising-edge or

falling-edge sensing. For external interrupt pin IRQ5, the falling edge is sensed.

Vector fetch

Internal

address bus

Internal read

signal

Internal write

signal

Internal data

bus (16 bits)

RES

Internal

processing

Prefetch of

first instruction

of program

(1) Reset exception handling vector address (H'0000)

(2) Program starting address

(3) First instruction of program

(2)

(1)

(3)

(2)

Reset state

Reset exception handling and program execution

HD6433713 Datasheet(PDF) 67 Page - Renesas Technology Corp