HD404889_03 Datasheet, PDF (52/197 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
Operating Modes
The five operating modes shown in table 19 can be used for the MCU.
The function of each mode is shown in table 20, and the state transition diagram among each mode in
figure 13.
Table 19 Operating Modes and Clock Status
Mode Name
Active
Standby Stop
Watch
Subactive*²
Activation method
RESET
SBY
cancellation, instruction
interrupt
request, WU₀
to
WU
3
input
in stop mode
STOP/SBY
instruction in
subactive
mode (when
direct
transfer is
selected)
STOP
instruction
when
TMA3 = 0
STOP
instruction
when
TMA3 = 1
INT₀/timer A
or
WU
0
to
WU₃ interrupt
request in
watch mode
Status
System oscillator
OP
OP
Stopped
Stopped
Stopped
Subsystem oscillator OP
OP
OP *¹
OP
OP
Cancellation method
RESET
input,
STOP/SBY
instruction
RESET
input,
interrupt
request
RESET
input,
WU₀ to WU₃
input
RESET
RESET
input,
input,
INT₀/timer A STOP/SBY
or WU to instruction
0
WU
3
interrupt
request
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: $004)
2. Subactive mode is an optional function; specify it on the fnction option list.
Rev.6.00, Sep.08.2003, page 52 of 197