UPD78F1154GK-GAK-AX NEC, UPD78F1154GK-GAK-AX Datasheet - Page 43

• Manufacturer Part Number: UPD78F1154GK-GAK-AX
• Description: 16BIT MCU, 128K FLASH, 8K RAM, SMD
• Manufacturer: NEC

Specifications of UPD78F1154GK-GAK-AX

• Controller Family/series: UPD78F
• No. Of I/o's: 70
• Ram Memory Size: 8192Byte
• Cpu Speed: 20MHz
• No. Of Timers: 9
• No. Of: RoHS Compliant
• Core Size: 16bit
• Program Memory Size: 128KB
• Oscillator Type: External, Internal

7.5 Watchdog Timer
signal is generated.
WDCS2 to WDCS0 of
option byte (000C0H)
WINDOW0 of option
WDTON of option
The watchdog timer operates on the internal low-speed oscillation clock.
The watchdog timer is used to detect an inadvertent program loop. If a program loop is detected, an internal reset
The watchdog timer uses the following register.
(1) Watchdog timer enable register (WDTE)
WDTINT of option
WINDOW1 and
byte (000C0H)
byte (000C0H)
byte (000C0H)
This register is used to control the operation of the watchdog timer/counter.
f
IL
controller
Clock
input
(Count value overflow time x 3/4)
Watchdog timer enable
Window size check
register (WDTE)
Interval time controller
counter
Figure 7-4. Block Diagram of Watchdog Timer
20-bit
Count clear
signal
Preliminary Product Information U17892EJ2V0PM
f
IL
/2
10
to f
Internal bus
IL
/2
20
decision signal
Selector
Window size
WDTE except ACH
Write detector to
Overflow signal
controller
output
Reset
78K0R/KF3
Interval time interrupt
(INTWDTI)
Internal reset signal
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