HD404639R Datasheet, PDF (27/135 Pages) Renesas Technology Corp – 4-Bit Single-Chip Microcomputer

HD404639R Series
Operating Modes
The MCU has five operating modes as shown in table 17. The operations in each mode are listed in tables
18 and 19. Transitions between operating modes are shown in figure 14.
Table 17 Operating Modes and Clock Status
Mode Name
Active
Standby Stop
Watch
Subactive
Activation
method
RESET
cancellation,
interrupt
request
STOPC
cancellation in
stop mode,
STOP/SBY
instruction in
subactive
mode (when
direct transfer
is selected)
SBY
instruction
STOP
STOP
INT₀ or timer A
instruction when instruction when interrupt request
TMA3 = 0
TMA3 = 1
from watch
STOP/SBY
instruction in
mode when
LSON = 1
subactive mode
(when direct
transfer is not
selected)
Status
System OP
oscillator
OP
Stopped
Stopped
Stopped
Subsystem OP
OP
OP *¹
OP
OP
oscillator
Cancellation
method
RESET input,
STOP/SBY
instruction
RESET
input,
interrupt
request
RESET input, RESET input, RESET input,
STOPC input in INT₀ or timer A STOP/SBY
stop mode
interrupt request instruction
Notes: OP implies in operation
1. Operating or stopping the oscillator can be selected by setting bit 3 of system clock select
register 1 (SSR1: $029).
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