HD404328 Datasheet, PDF (31/96 Pages) Hitachi Semiconductor – 4 BIT SINGLE CHIP MICROCOMPUTER

Standby
Oscillator: Active
Peripheral clocks: Active
All other clocks: Stopped
Watch
Oscillator: Stopped
Sub-oscillator: Active
Peripheral clocks: Stopped
All other clocks: Stopped
HD404328 Series
No
RESET
= 1?
Yes _IF0 No
= 1?
Yes
IM0
= 0? _No
Yes
IF1 ^No
= 1?
Yes
IM1
= 0? _No
Yes
(SBY
only)
IFTA ^No
= 1?
Yes
IFTB ^No
= 1?
IMTA
= 0? _No
Yes
Yes
IMTB
= 0? _No
Yes
IFTC ^No
= 1?
Yes
IMTC
= 0? _No
Yes
IFZC ^No
= 1?
Yes
IMZC
= 0? _No
IFAD ^No
= 1?
Yes
No
IFS
= 1?
Yes
IMAD
Yes
= 0? _No
Yes
IMS
= 0? _No
(SBY
only)
(SBY
only)
(SBY
only)
(SBY
only)
(SBY Yes
only)
Restart
processor clocks
Reset MCU
Execute next
instruction
Restart
processor clocks
Execute next
instruction
No
IF = 1,
IM = 0,
IE = 1?
Yes
Accept interrupt
Figure 11 MCU Operation Flowchart
29