UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 176

• Manufacturer Part Number: UPD78F0988AGC-8BS
• Manufacturer: Renesas Electronics America

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

9.3 Configuration of Watchdog Timer
174
(2) Interval timer mode
The watchdog timer includes the following hardware.
Oscillation stabilization
time select register
(OSTS)
Interval Time
2
2
2
2
12
13
14
15
When the watchdog timer is used as an interval timer, it generates an interrupt request at preset time intervals.
Note Expanded-specification products only.
Remark f
f
X
/2
1/f
1/f
1/f
1/f
f
X
8
X
X
X
X
OSTS2 OSTS1 OSTS0
Clock input
controller
Control registers
At f
X
RUN
: System clock oscillation frequency
X
= 12 MHz
341.3 s
682.6 s
1.36 ms
2.73 ms
Item
Note
Watchdog timer
clock select
register (WDCS)
Table 9-3. Configuration of Watchdog Timer
Figure 9-1. Watchdog Timer Block Diagram
Division mode
Divider
At f
selector
Watchdog timer clock select register (WDCS)
Watchdog timer mode register (WDTM)
Oscillation stabilization time select register (OSTS)
X
488.8 s
977.6 s
WDCS2 WDCS1 WDCS0
1.96 ms
3.91 ms
= 8.38 MHz
CHAPTER 9 WATCHDOG TIMER
User’s Manual U13029EJ7V1UD
Table 9-2. Interval Time
Internal bus
Division clock
3
selector
Interval Time
2
2
2
2
16
17
18
20
Configuration
1/f
1/f
1/f
1/f
X
X
X
X
RUN
At f
WDTM4 WDTM3
X
= 12 MHz
5.46 ms
10.9 ms
21.8 ms
87.3 ms
controller
Output
Watchdog timer
mode register
(WDTM)
Note
At f
125.1 ms
X
7.82 ms
15.6 ms
31.3 ms
= 8.38 MHz
INTWDT
RESET
WDT mode signal