upd78f0148m1gka1-9eu Renesas Electronics Corporation., upd78f0148m1gka1-9eu Datasheet - Page 261

• Manufacturer Part Number: upd78f0148m1gka1-9eu
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(3) When the CPU clock is the internal oscillation clock (f
Note Confirm the oscillation stabilization time of f
input 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
CPU operation
Watchdog timer
Watchdog timer
(OSTC).
select register (OSTS) has elapsed
f
f
(CPU Clock: Internal Oscillation Clock, WDT Operation Clock: X1 Input Clock)
XP
f
XP
f
R
R
XP
Normal operation
Normal operation
oscillation clock)
oscillation clock)
) when the STOP instruction is executed
(Internal
(Internal
Operating
Operating
Normal operation (Internal oscillation clock)
Oscillation
Oscillation
stopped
stopped
Figure 11-6. Operation in STOP Mode
STOP
STOP
CHAPTER 11 WATCHDOG TIMER
User’s Manual U15947EJ3V1UD
Operation stopped
Operation stopped
Clock supply stopped
Oscillation stabilization time
Oscillation stabilization time
(set by OSTS register)
Clock supply
XP
(set by OSTS register)
17 clocks
17 clocks
stopped
using the oscillation stabilization time counter status register
XP
).
R
) and the watchdog timer operation clock is the X1
Normal operation (Internal oscillation clock)
CPU clock
f
R
→ f
Normal operation (X1 input clock)
XP
Note
Operating
Operating
XP
)
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