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MESC TECHNICAL NEWS

No.M16C-12-9711

(1/1)

GRADE

Note on the interrupt control register

of the M16C/60 series MCU

1. Related devices

M16C/60 series

2. Note

Do not rewrite to interrupt control register when the interrupt enable flag is enable

state ( I flag = "1" ). A rewrite instruction includes read modify write instructions

such as BSET.

3. Cause

If the interrupt request bit is cleared ("0") or the interrupt priority level is changed

after the interrupt request bit is set ("1"), the interrupt information may not be

read correctly when reading address 0000016 in interrupt sequence. As a result,

another interrupt( e.g. BRK instruction interrupt ) may occur.

4. Solution

When you want to rewrite to interrupt control register, clear interrupt enable flag

( I flag = "0" ) before rewriting interrupt control register.

Related to M16C/60, M16C/20 series devices.

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