HD404318 Datasheet, PDF (21/68 Pages) Hitachi Semiconductor – 4-bit HMCS400-series microcomputer

HD404318 Series
 ,
 ,Resetby
RESET input or
by watchdog timer
RAME = 0
RAME = 1
RESET 1 RESET 2
Standby mode
f_OSC: Oscillate
ø_CPU: Stop
ø_PER: f_cyc
Active
mode
SBY
instruction
Interrupt
f_OSC: Oscillate
ø_CPU: f_cyc
ø_PER: f_cyc
STOPC
Stop mode
STOP
instruction
f_OSC: Stop
ø_CPU: Stop
ø_PER: Stop
f_OSC: Main oscillation frequency
f_cyc: f_OSC/4
ø_CPU: System clock
ø_PER: Clock for other peripheral
functions
Figure 11 MCU Status Transitions
In stop mode, the system oscillator is stopped. To ensure a proper oscillation stabilization period of at least
t_RC when clearing stop mode, execute the cancellation according to the timing chart in figure12.
Oscillator
Internal
clock
Stop mode
RESET
or
STOPC
STOP instruction execution
t_res
t_res ≥ t_RC (stabilization period)
Figure 12 Timing of Stop Mode Cancellation
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