HD404818 Datasheet, PDF (37/100 Pages) Hitachi Semiconductor – 16-digit LCD driver

Low-power mode
operation cycle
IF = 1 and
No
IM = 0 ?
Yes
Standby/watch
mode
Hardware NOP
execution
No
IF = 1 and
IM = 0 ?
Yes
Hardware NOP
execution
HD404818 Series
Stop mode
PC ← next
Iocation
PC ← next
Iocation
Instruction
execution
MCU operation
cycle
For specific IF and IM, see figure 10, MCU Operating Flowchart
Figure 17 MCU Operating Sequence (low-power mode operation)
Notes on Use:
• In subactive mode, a timer A interrupt request or an external interrupt request (INT₀) occurs in
synchronism with an interrupt strobe.
If the STOP or SBY instruction is executed at the same time with an interrupt strobe, these interrupt
requests will be cancelled and the corresponding interrupt request flags (IFTA, IF0) will not be set.
In subactive mode, do not use the STOP or SBY instruction at the time of an interrupt strobe.
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