Datasheet

Section 5 Interrupt Controller
R01UH0309EJ0500 Rev. 5.00 Page 145 of 1408
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
5.6.4 Interrupt Response Times
Table 5.4 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 5.4 are explained in table 5.5. This LSI is capable of fast word transfer to
on-chip memory, and have the program area in on-chip ROM and the stack area in on-chip RAM,
enabling high-speed processing.
Table 5.4 Interrupt Response Times
Normal Mode
*
5
Advanced Mode
No. Execution Status
Interrupt
control
mode 0
Interrupt
control
mode 2
Interrupt
control
mode 0
Interrupt
control
mode 2
1 Interrupt priority determination
*
1
3 3 3 3
2 Number of wait states until executing
instruction ends
*
2
1 to
19 +2·S
I
1 to
19+2·S
I
1 to
19+2·S
I
1 to
19+2·S
I
3 PC, CCR, EXR stack save 2·S
K
3·S
K
2·S
K
3·S
K
4 Vector fetch S
I
S
I
2·S
I
2·S
I
5 Instruction fetch
*
3
2·S
I
2·S
I
2·S
I
2·S
I
6 Internal processing
*
4
2 2 2 2
Total (using on-chip memory) 11 to 31 12 to 32 12 to 32 13 to 33
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.
5. Not available in this LSI.