SH7018 datasheet(89/431 Pages) RENESAS

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Table 6.5

Interrupt Response Time

Number of States

Item

NMI, Peripheral

Module

IRQ

Notes

Compare identified inter-

rupt priority with SR mask

level

Wait for completion of

sequence currently being

executed by CPU

X (

≥ 0)

The longest sequence is for

interrupt or address-error

exception processing (X = 4

+ m1 + m2 + m3 + m4). If an

interrupt-masking instruction

follows, however, the time

may be even longer.

Time from start of interrupt

exception processing until

fetch of first instruction of

exception service routine

starts

5 + m1 + m2 + m3

Performs the PC and SR

saves and vector address

fetch.

Interrupt

Total 7 + m1 + m2 + m3

9 + m1 + m2 + m3

response

Minimum 10

20 MHz operation:

0.5 to 0.6 µs

time

Maximum 12 + 2 (m1 + m2 +

m3) + m4

13 + 2 (m1 + m2 +

m3) + m4

20 MHz operation:

0.95 to 1.0 µs*

Note: * When m1 = m2 = m3 = m4 = 1

m1 to m4 are the number of states needed for the following memory accesses.

m1: SR save (longword write)

m2: PC save (longword write)

m3: Vector address read (longword read)

m4: Fetch first instruction of interrupt service routine

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