H8SLASH3021 datasheet(126/712 Pages) RENESAS

Nome de Peças	H8/3021

Descrição Electrónicos	16-Bit Single-Chip Microcomputer

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Fabricante Electrônico	RENESAS [Renesas Technology Corp]

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5. Interrupt Controller

Rev.2.00 Mar. 22, 2007 Page 102 of 684

REJ09B0352-0200

5.4.3

Interrupt Response Time

Table 5.5 indicates the interrupt response time from the occurrence of an interrupt request until the

first instruction of the interrupt service routine is executed.

Table 5.5

Interrupt Response Time

External Memory

On-Chip

8-Bit Bus

No.

Item

Memory

2 States

3 States

Interrupt priority decision

Maximum number of states

1 to 23

1 to 27

1 to 31*

until end of current instruction

Saving PC and CCR to stack

12*

Vector fetch

12*

Instruction prefetch*

12*

Internal processing*

Total

19 to 41

31 to 57

43 to 73

Notes: 1. 1 state for internal interrupts.

2. Prefetch after the interrupt is accepted and prefetch of the first instruction in the

interrupt service routine.

3. Internal processing after the interrupt is accepted and internal processing after prefetch.

4. The number of states increases if wait states are inserted in external memory access.

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