HD404639R Datasheet, PDF (31/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer

Stop
Standby
Oscillator: Stop
Suboscillator: Active/Stop
Peripheral clocks: Stop
All other clocks: Stop
Oscillator: Active
Peripheral clocks: Active
All other clocks: Stop
HD404639R Series
Watch
Oscillator: Stop
Suboscillator: Active
Peripheral clocks: Stop
All other clocks: Stop
No
RESET = 1?
Yes
No
STOPC = 0?
Yes
RAME = 1
No
RESET = 1?
Yes _{IF0 • IM0 = 1? No}
RAME = 0
Yes
No
IF1 • IM1 = 1?
Yes
(SBY
only)
IFTA • IMTA ^No
= 1?
Yes
IFTB •
IMTB + IF2 •
No
IM2 = 1?
Yes
IFTC •
IMTC + IF3 •
No
IM3 = 1?
Yes
IFTD •
IMTD + IF4 •
No
IM4 = 1?
Yes
IFS1 •
IMS1 + IFS2 •
No
IMS2 = 1?
(SBY
only)
(SBY
only)
(SBY
only)
(SBY _Yes
only)
Restart
processor clocks
Restart
processor clocks
Execute
next instruction
Reset MCU
No
Execute
next instruction
IF = 1,
IM = 0, and
IE = 1?
Yes
Accept interrupt
Figure 15 MCU Operation Flowchart
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