upd78f9211grt2-jjg-a ETC-unknow, upd78f9211grt2-jjg-a Datasheet - Page 146

• Manufacturer Part Number: upd78f9211grt2-jjg-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: ETC-unknow

(2) When the watchdog timer operation clock is the low-speed internal oscillation clock (f
8.4.4
the watchdog timer is the system clock (f
counting is started again using the operation clock before the operation was stopped. At this time, the counter is not
cleared to 0 but holds its value.
146
The watchdog timer stops counting during HALT instruction execution regardless of whether the operation clock of
instruction is executed
When the STOP instruction is executed, operation of the watchdog timer is stopped. After STOP mode is
released, operation stops for 34
operation was stopped. At this time, the counter is not cleared to 0 but holds its value.
Watchdog timer
Figure 8-7. Operation in STOP Mode (WDT Operation Clock: Low-Speed Internal Oscillation Clock)
CPU operation
Note The operation stop time is 17
Watchdog timer operation in HALT mode (when “low-speed internal oscillator can be stopped by
software” is selected by option byte)
CPU operation
Watchdog timer
Watchdog timer
f
CPU operation
CPU
f
RL
f
X
<2> CPU clock: High-speed internal oscillation clock or external clock input
or f
Operating
operation
f
CPU
Normal
RL
Normal operation
f
CPU
f
RL
Operating
Operating
operation
Normal
<1> CPU clock: Crystal/ceramic oscillation clock
STOP
Oscillation stopped
Operation stopped
Operation stopped
µ
s
Figure 8-8. Operation in HALT Mode
(
TYP.
X
HALT
) or low-speed internal oscillation clock (f
CHAPTER 8 WATCHDOG TIMER
STOP
stopped
µ
Operation
Oscillation stopped
) and then counting is started again using the operation clock before the
Operation stopped
s (MIN.), 34
User’s Manual U16994EJ3V0UD
Note
stopped
Operation
Oscillation stabilization time
Oscillation stabilization time
µ
s (TYP.), and 67
(set by OSTS register)
Note
Operating
Normal operation
Operating
µ
s (MAX.).
Normal operation
Operating
RL
). After HALT mode is released,
Normal operation
RL
) when the STOP