M38005M2FS View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M38005M2FS

8-BIT SINGLE-CHIP MICROCOMPUTER

MITSUBISHI ELECTRIC  

HARDWARE

FUNCTIONAL DESCRIPTION SUPPLEMENT

Timing After Interrupt

The interrupt processing routine begins with the machine cycle fol-

lowing the completion of the instruction that is currently in execu-

tion.

Figure 32 shows a timing chart after an interrupt occurs, and Fig-

ure 33 shows the time up to execution of the interrupt processing

routine.

φ

SYNC

RD

WR

Address bus

PC

S, SPS S-1, SPS S-2, SPS BL BH AL, AH

Data bus

Not used PCH PCL PS AL AH

SYNC : CPU operation code fetch cycle

BL, BH : Vector address of each interrupt

AL, AH : Jump destination address of each interrupt

SPS : “0016” or “0116”

Fig. 32 Timing chart after an interrupt occurs

Generation of interrupt request

Start of interrupt processing

Main routine

Waiting time for

post-processing

of pipeline

Stack push and Interrupt processing routine

Vector fetch

0 to 16T cycles

2 cycles

5 cycles

7 to 23 cycles

(At performing 8.0 MHz, 1.75 µs to 5.75 µs)

T : at execution of DIV instruction (16 cycles)

Fig. 33 Time up to execution of the interrupt processing routine

1-34

3800 GROUP USER’S MANUAL

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