CHAPTER 13 STANDBY FUNCTION
User’s Manual U16898EJ3V0UD
233
13.2.2 STOP mode
(1) STOP mode setting and operating statuses
The STOP mode is set by executing the STOP instruction.
Caution Because an interrupt request signal is used to clear the standby mode, if there is an interrupt
source with the interrupt request flag set and the interrupt mask flag reset, the standby
mode is immediately cleared if set. Thus, in the STOP mode, the normal operation mode is
restored after the STOP instruction is executed and then the operation is stopped for 34
µ
s
(TYP.) (after an additional wait time for stabilizing the oscillation set by the oscillation
stabilization time select register (OSTS) has elapsed when crystal/ceramic oscillation is
used).
The operating statuses in the STOP mode are shown below.
Table 13-4. Operating Statuses in STOP Mode
Low-Speed Internal Oscillator Can Be Stopped
Note
Setting of HALT Mode
Item
Low-Speed Internal
Oscillator Cannot Be
Stopped
Note
When Low-Speed Internal
Oscillation Continues
When Low-Speed Internal
Oscillation Stops
System clock
Oscillation stops.
CPU Operation
stops.
Port (latch)
Holds status before STOP mode is set.
16-bit timer/event counter 00
Operation stops.
8-bit timer 80
Operation stops.
Sets count clock to f
XP
to f
XP
/2
12
Operation stops.
8-bit timer
H1
Sets count clock to f
RL
/2
7
Operable
Operable
Operation
stops.
“Clock to peripheral hardware”
selected as operating clock
Setting prohibited
Operation stops.
Watchdog
timer
“Low-speed internal oscillation
clock” selected as operating
clock
Operable (Operation
continues.)
Operation stops.
A/D converter
Operation stops.
Serial interface UART6
Operation stops.
Power-on-clear circuit
Always operates.
Low-voltage detector
Operable
External interrupt
Operable
Note
“Cannot be stopped” or “Stopped by software” is selected for low-speed internal oscillator by the option byte
(for the option byte, see
CHAPTER 17 OPTION BYTE
).