upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 213

• Manufacturer Part Number: upd78f0114hgb-8es-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

Notes 1.
Remarks 1. f
Watchdog timer clock
source
Operation after reset
Operation mode selection
Features
2.
2. f
As long as power is being supplied, internal oscillator oscillation 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 10-2. Option Byte Setting and Watchdog Timer Operation Mode
R
XP
: Internal oscillation clock oscillation frequency
: High-speed system clock oscillation frequency
conditions.
conditions.
When f
In HALT/STOP mode
During oscillation stabilization time
If the CPU clock is f
instruction
In HALT/STOP mode
XP
Fixed to f
Operation starts with the maximum
interval (2
The interval can be changed only
once.
The watchdog timer cannot be
stopped.
Internal Oscillator Cannot Be Stopped
is stopped
CHAPTER 10 WATCHDOG TIMER
R
User’s Manual U16961EJ4V0UD
18
Note 1
/f
R
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
Option Byte
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
Internal Oscillator Can Be Stopped by
Selectable by software (f
stopped)
When reset is released: f
18
/f
R
).
Note 2
Software
.
XP
R
, f
R
or
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