HD404818 Datasheet, PDF (31/100 Pages) Hitachi Semiconductor – 16-digit LCD driver

HD404818 Series
the next instruction after the SBY instruction. If the interrupt enable flag is 1, that interrupt is then
processed; if it is 0, the interrupt request is left pending and normal instruction execution continues. A
flowchart of operation in standby mode is shown in figure 10.
Standby
Oscillator: Active
Peripheral clocks:
Active
All other clocks:
Stop
Watch
Oscillator: Stop
Suboscillator: Active
Peripheral clocks: Stop
All other clocks: Stop
RESET ^No
=1?
Yes
IF0 = ^No
1?
Yes
IM0 =
0 ? No
IF1 = ^No
1?
Yes
Yes
IM1 =
0 ? No
(SBY only) Yes
IFTA = ^No
1?
Yes
IMTA =
0 ? No
IFTB = ^No
1?
Yes
Yes
IMTB =
0 ? No
(SBY only) Yes
IFTC = ^No
1?
Yes
IMTC =
0 ? No
IFS = ^No
1?
Yes
(SBY only) Yes
IMS =
0 ? No
(SBY only) Yes
Restart
processor clocks
Restart
processor clocks
Execute
next instruction
(active mode)
Reset MCU
No
IF = 1,
IM = 0, and
IE = 1?
Yes
Execute
next instruction
Accept interrupt
Figure 10 MCU Operating Flowchart of Watch and Standby Modes
29