M38504E2 View Datasheet(PDF) - MITSUBISHI ELECTRIC

Part Name

Description

Manufacturer

M38504E2

RAM size192 bytes; single-chip 8-bit microcomputer

MITSUBISHI ELECTRIC  

APPENDIX

3.3 Notes on use

3.3.3 Notes on interrupts

(1) Change of relevant register settings

When the setting of the following registers or bits is changed, the interrupt request bit may be set

to “1”. When not requiring the interrupt occurrence synchronized with these setting, take the following

sequence.

•Interrupt edge selection register (address 3A16)

•Timer XY mode register (address 2316)

Set the above listed registers or bits as the following sequence.

Set the corresponding interrupt enable bit to “0”

(disabled) .

↓

Set the interrupt edge select bit (active edge switch

bit) or the interrupt (source) select bit to “1”.

↓

NOP (one or more instructions)

↓

Set the corresponding interrupt request bit to “0”

(no interrupt request issued).

↓

Set the corresponding interrupt enable bit to “1”

(enabled).

Fig. 3.3.1 Sequence of changing relevant register

s Reason

When setting the followings, the interrupt request bit may be set to “1”.

•When setting external interrupt active edge

Concerned register: Interrupt edge selection register (address 3A16)

Timer XY mode register (address 2316)

•When switching interrupt sources of an interrupt vector address where two or more interrupt

sources are allocated.

Concerned register: Interrupt edge selection register (address 3A16)

3850 Group (Spec. H) User’s Manual

3-33

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