UPD78F9502MA-CAC-A NEC, UPD78F9502MA-CAC-A Datasheet - Page 88

• Manufacturer Part Number: UPD78F9502MA-CAC-A
• Description: 8BIT MCU, 4K FLASH, 128B RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F9502MA-CAC-A

• Controller Family/series: UPD78F
• No. Of I/o's: 8
• Ram Memory Size: 128Byte
• Cpu Speed: 10MHz
• No. Of Timers: 2
• No. Of Pwm: RoHS Compliant
• Core Size: 8bit
• Program Memory Size: 4KB
• Oscillator Type: External, Internal

Notes 1. As long as power is being supplied, low-speed internal oscillator cannot be stopped (except in the reset
88
Watchdog timer clock
source
Operation after reset
Operation mode
selection
Features
Remarks 1. f
2. The conditions under which clock supply to the watchdog timer is stopped differ depending on the clock
period).
source of the watchdog timer.
<1> If the clock source is f
<2> If the clock source is f
2. f
RL
X
When f
In HALT/STOP mode
During oscillation stabilization time
: System clock oscillation frequency
If the CPU clock is f
In HALT/STOP mode
: Low-speed internal oscillation clock oscillation frequency
Table 7-2. Option Byte Setting and Watchdog Timer Operation Mode
Operation starts with the maximum interval (2
Fixed to f
The interval can be changed only once.
The watchdog timer cannot be stopped.
Low-Speed Internal Oscillator Cannot Be Stopped Low-Speed Internal Oscillator Can Be Stopped by Software
X
is stopped
RL
Note 1
.
X
RL
X
, clock supply to the watchdog timer is stopped under the following conditions.
and if f
, clock supply to the watchdog timer is stopped under the following conditions.
Preliminary User’s Manual U18681EJ1V0UD
CHAPTER 7 WATCHDOG TIMER
RL
is stopped by software before execution of the STOP instruction
Option Byte Setting
18
/f
RL
). Operation starts with the maximum interval
(2
The clock selection/interval can be changed only
once.
The watchdog timer can be stopped
18
Selectable by software (f
When reset is released: f
/f
RL
).
X
RL
, f
RL
or stopped)
Note 2
.