upd78f0114hgb-8es-a Renesas Electronics Corporation., upd78f0114hgb-8es-a Datasheet - Page 214
upd78f0114hgb-8es-a
Manufacturer Part Number
upd78f0114hgb-8es-a
Description
8-bit Single-chip Microcontrollers
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD78F0114HGB-8ES-A.pdf
(505 pages)
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10.2 Configuration of Watchdog Timer
10.3 Registers Controlling Watchdog Timer
(1) Watchdog timer mode register (WDTM)
214
Watchdog timer enable
register (WDTE)
The watchdog timer includes the following hardware.
The watchdog timer is controlled by the following two registers.
This register sets the overflow time and operation clock of the watchdog timer.
This register can be set by an 8-bit memory manipulation instruction and can be read many times, but can be
written only once after reset is released.
RESET input sets this register to 67H.
Watchdog timer mode register (WDTM)
Watchdog timer enable register (WDTE)
f
XP
f
R
/2
/2
4
2
Control registers
controller
Clock
input
2
Item
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)
1
2
2
or
2
2
Internal bus
13
20
11
18
User’s Manual U16961EJ4V0UD
/f
/f
/f
/f
XP
XP
R
R
WDCS4
to
to
Selector
WDCS3
3
WDCS2
WDCS1 WDCS0
Configuration
controller
Output
Internal reset signal
Option byte
(to set “internal oscillator
cannot be stopped” or
“internal oscillator can be
stopped by software”)
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