upd78f0148m1gka1-9eu Renesas Electronics Corporation., upd78f0148m1gka1-9eu Datasheet - Page 253

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

Watchdog timer clock
source
Operation after reset
Operation mode selection The interval can be changed only once.
Features
Notes 1.
Remarks 1. f
2.
2. f
As long as power is being supplied, internal oscillator cannot be stopped (except in the reset
period).
The conditions under which clock supply to the watchdog timer is stopped differ depending on
the clock source of the watchdog timer.
<1> If the clock source is f
<2> If the clock source is f
Table 11-2. Mask Option Setting and Watchdog Timer Operation Mode
R
XP
: Internal oscillation clock frequency
: X1 input clock oscillation frequency
conditions.
• When f
• In HALT/STOP mode
• During oscillation stabilization time
conditions.
• If the CPU clock is f
• In HALT/STOP mode
instruction
Fixed to f
Operation starts with the maximum interval
(2
The watchdog timer cannot be stopped.
18
/f
Internal Oscillator Cannot Be Stopped
R
).
XP
R
Note 1
is stopped
.
CHAPTER 11 WATCHDOG TIMER
User’s Manual U15947EJ3V1UD
XP
R
XP
, clock supply to the watchdog timer is stopped under the following
, clock supply to the watchdog timer is stopped under the following
and if f
R
is stopped by software before execution of the STOP
Mask Option
Internal Oscillator Can Be Stopped by Software
• Selectable by software (f
• When reset is released: f
Operation starts with the maximum interval
(2
The clock selection/interval can be changed
only once.
The watchdog timer can be stopped in
standby mode
18
/f
R
).
Note 2
.
XP
R
, f
R
or stopped)
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