upd78f0114m6gb-8es Renesas Electronics Corporation., upd78f0114m6gb-8es Datasheet - Page 222

• Manufacturer Part Number: upd78f0114m6gb-8es
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(3) When the CPU clock is the Ring-OSC clock (f
222
Note Confirm the oscillation stabilization time of f
CPU operation
clock (f
When the STOP instruction is executed, operation of the watchdog timer is stopped. After STOP mode is
released, counting is stopped until the timing of <1> or <2>, whichever is earlier, and then counting is started
using the operation clock before the operation was stopped. At this time, the counter is not cleared to 0 but holds
its value.
<1> The oscillation stabilization time set by the oscillation stabilization time select register (OSTS) elapses.
<2> The CPU clock is switched to the X1 input clock (f
<1> Timing when counting is started after the oscillation stabilization time set by the oscillation stabilization time
<2> Timing when counting is started after the CPU clock is switched to the X1 input clock (f
CPU operation
Watchdog timer
Watchdog timer
(OSTC).
select register (OSTS) has elapsed
XP
) when the STOP instruction is executed
f
f
XP
f
XP
f
R
(Ring-OSC clock)
(Ring-OSC clock)
R
Normal operation
Normal operation
(CPU Clock: Ring-OSC Clock, WDT Operation Clock: X1 Input Clock)
Operating
Operating
Normal operation (Ring-OSC clock)
Oscillation
Oscillation
stopped
stopped
Figure 10-6. Operation in STOP Mode
STOP
STOP
CHAPTER 10 WATCHDOG TIMER
User’s Manual U16227EJ3V0UD
Operation stopped
Operation stopped
Oscillation stabilization time
Clock supply stopped
Oscillation stabilization time
(set by OSTS register)
Clock supply
XP
R
(set by OSTS register)
17 clocks
17 clocks
) and the watchdog timer operation clock is the X1 input
stopped
using the oscillation stabilization time counter status register
XP
).
CPU clock
f
R
→ f
Normal operation (Ring-OSC clock)
Normal operation (X1 input clock)
XP
Note
Operating
Operating
XP
)