H8S2245 datasheet(167/818 Pages) RENESAS

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Section 5 Interrupt Controller

Rev.3.00 Mar. 26, 2007 Page 125 of 772

REJ09B0355-0300

5.4.5

Interrupt Response Times

The H8S/2245 Group is capable of fast word transfer instruction to on-chip memory, and the

program area is provided in on-chip ROM and the stack area in on-chip RAM, enabling high-

speed processing.

Table 5.8 shows interrupt response times - the interval between generation of an interrupt request

and execution of the first instruction in the interrupt handling routine. The execution status

symbols used in table 5.8 are explained in table 5.9.

Table 5.8

Interrupt Response Times

Normal Mode

Advanced Mode

No.

Execution Status

INTM1 = 0

Interrupt priority determination*

Number of wait states until executing

instruction ends*

1 to 19+2·S

PC, CCR stack save

2·S

Vector fetch

2·S

Instruction fetch*

2·S

Internal processing*

Total (using on-chip memory)

11 to 31

12 to 32

Notes: 1. Two states in case of internal interrupt.

2. Refers to MULXS and DIVXS instructions.

3. Prefetch after interrupt acceptance and interrupt handling routine prefetch.

4. Internal processing after interrupt acceptance and internal processing after vector fetch.

Table 5.9

Number of States in Interrupt Handling Routine Execution Statuses

Object of Access

External Device

8 Bit Bus

16 Bit Bus

Symbol

Internal

Memory

2-State

Access

3-State

Access

2-State

Access

3-State

Access

Instruction fetch

6+2m

3+m

Branch address read

Stack manipulation

Legend:

m: Number of wait states in an external device access.

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