upd78f0103hmca1-5a4-a Renesas Electronics Corporation., upd78f0103hmca1-5a4-a Datasheet - Page 172

• Manufacturer Part Number: upd78f0103hmca1-5a4-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

172
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, the 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 9-2. Option Byte Setting and Watchdog Timer Operation Mode
R
XP
: Internal oscillation clock frequency
: High-speed system 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
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 9 WATCHDOG TIMER
R
User’s Manual U16846EJ3V0UD
18
Note 1
/f
XP
R
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
• Selectable by software (f
• When reset is released: f
Operation starts with 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
stopped)
18
/f
R
).
Note 2
Software
.
XP
R
, f
R
or