HD404449 Datasheet, PDF (27/123 Pages) Hitachi Semiconductor – HD404449 SERIES

HD404449 Series
Operating Modes
The MCU has five operating modes as shown in table 19. The operations in each mode are listed in tables
20 and 21. Transitions between operating modes are shown in figure 14.
Active Mode: All MCU functions operate according to the clock generated by the system oscillators OSC₁
and OSC₂.
Table 19 Operating Modes and Clock Status
Mode Name
Active
Standby
Stop
Watch
Subactive*²
Activation method
RESET
SBY instruction
cancellation,
interrupt
request, STOPC
cancellation in
stop mode,
STOP/SBY
instruction in
subactive mode
(when direct
transfer is
selected)
STOP
STOP
INT₀ or timer A
instruction when instruction when interrupt request
TMA3 = 0
TMA3 = 1
from watch
mode
Status System OP
OP
Stopped
Stopped
Stopped
oscillator
Subsystem OP
OP
OP*¹
OP
OP
oscillator
Cancellation
method
RESET input,
STOP/SBY
instruction
RESET input, RESET input, RESET input, RESET input,
interrupt request STOPC input in INT₀ or timer A STOP/SBY
stop mode
interrupt request instruction
Note:
OP implies in operation
1. Operating or stopping the oscillator can be selected by setting bit 3 of the system clock select
register (SSR: $029).
2. Subactive mode is an optional function; specify it on the function option list.
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