UPD78F0138 NEC, UPD78F0138 Datasheet - Page 239

• Manufacturer Part Number: UPD78F0138
• Description: (UPD78xxxx) 8-Bit Single-Chip Microcontrollers
• Manufacturer: NEC

10.2 Configuration of Watchdog Timer
The watchdog timer includes following hardware.
Watchdog timer enable
register (WDTE)
f
XP
f
R
/2
/2
4
2
Control registers
controller
Clock
input
Item
2
Watchdog timer mode
register (WDTM)
0
Figure 10-1. Block Diagram of Watchdog Timer
Table 10-3. Configuration of Watchdog Timer
counter
16-bit
1
Clear
CHAPTER 10 WATCHDOG TIMER
Watchdog timer mode register (WDTM)
Watchdog timer enable register (WDTE)
or
f
f
1
f
f
R
R
XP
XP
Internal bus
User’s Manual U16228EJ2V0UD
/2
/2
/2
/2
11
18
13
20
WDCS4
to
to
Selector
WDCS3
3
WDCS2
Configuration
WDCS1 WDCS0
controller
Output
3
Internal reset signal
Mask option
(to set “Ring-OSC
cannot be stopped” or
“Ring-OSC can be
stopped by software”)
239