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| HD404639R Datasheet, PDF (36/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer | |||
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HD404639R Series
MCU operation
cycle
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 âVector
address
IF: Interrupt request flag
IM: Interrupt mask
IE: Interrupt enable flag
PC: Program counter
CA: Carry flag
ST: Status flag
Figure 21 MCU Operating Sequence (MCU Operation Cycle)
34
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