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| HD404369 Datasheet, PDF (37/117 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer | |||
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MCU operation
cycle
HD404369 Series
IF = 1?
No
Instruction
execution
Yes
No IM = 0 and
IE = 1?
Yes
Yes SBY/STOP
instruction?
No
Low-power mode
operation cycle
PC â Next
location
IE â 0
Stack â (PC),
(CA),
(ST)
PC â Vector
address
IF: Interrupt request flag
IM: Interrupt mask
IE: Interrupt enable flag
PC: Program counter
CA: Carry flag
ST: Status flag
Figure 18 MCU Operating Sequence (MCU Operation Cycle)
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