HD404629R Datasheet, PDF (33/157 Pages) Renesas Technology Corp – AS Microcomputer Incorporating a DTMF Generator Circuit

HD404629R 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 oscillator OSC₁
and OSC₂.
Table 19 Operating Modes and Clock Status
Activation
method
Status
System
oscillator
Active
RESET
cancellation,
interrupt
request,
STOPC
cancellation
in stop mode,
STOP/SBY
instruction in
subactive mode
(when direct
transfer is
selected)
OP
Standby
SBY
instruction
OP
Mode Name
Stop
STOP
instruction
when
TMA3 = 0
Watch
STOP
instruction
when
TMA3 = 1
Stopped
Stopped
Subactive^*2
INT₀ or timer A
interrupt request
from watch
mode
Stopped
Subsystem OP
oscillator
OP
OP*1
OP
OP
Cancellation
method
RESET input,
STOP/SBY
instruction
RESET input, RESET input,
interrupt
STOPC input
request
in stop mode
RESET input,
INT₀ or timer A
interrupt
request
RESET input,
STOP/SBY
instruction
Notes: 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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