
115
Table 6.5
Interrupt Response Time
Number of States
Item
NMI, Peripheral
Module
IRQ
Notes
DMAC/DTC active
judgment
0 or 1
1
1 state required for interrupt
signals for which
DMAC/DTC activation is
possible
Compare identified inter-
rupt priority with SR mask
level
2
3
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
12
0.35–0.42 µs at 28.7 MHz
time
Maximum:
12 + 2 (m1 + m2 +
m3) + m4
13 + 2 (m1 + m2 +
m3) + m4
0.67–0.70 µs at 28.7 MHz
*
Note:
*
When m1 = m2 = m3 = m4 = 1
m1–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
Summary of Contents for SH7041 Series
Page 2: ......
Page 6: ......
Page 38: ...xvi ...
Page 44: ...6 ...
Page 46: ...8 ...
Page 48: ...10 ...
Page 82: ...44 ...
Page 114: ...76 ...
Page 118: ...80 ...
Page 124: ...86 ...
Page 170: ...132 ...
Page 250: ...212 ...
Page 492: ...454 ...
Page 506: ...468 ...
Page 604: ...566 ...
Page 684: ...646 ...
Page 706: ...668 ...
Page 778: ...740 ...
Page 780: ...742 ...
Page 818: ...780 ...
Page 850: ...812 ...
Page 923: ...SH7040 SH7041 SH7042 SH7043 SH7044 SH7045 Group Hardware Manual REJ09B0044 0600O ...