UPD78F0988AGC-8BS Renesas Electronics America, UPD78F0988AGC-8BS Datasheet - Page 175

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

Specifications of UPD78F0988AGC-8BS

• Lead Free Status / Rohs Status: Supplier Unconfirmed

9.1 Outline of Watchdog Timer
or RESET signal at preset time intervals.
9.2 Function of Watchdog Timer
Detection Time
The watchdog timer can also be used to generate a non-maskable interrupt request, maskable interrupt request,
The watchdog timer has the following functions.
• Watchdog timer
• Interval timer
• Oscillation stabilization time specification
Caution Select the watchdog timer mode or interval timer mode by using the watchdog timer mode
(1) Watchdog timer mode
2
2
2
2
12
13
14
15
Loop
The watchdog timer is used to detect an inadvertent program loop. When a loop is detected, a non-maskable
interrupt request or the RESET signal can be generated.
Note Expanded-specification products only.
Remark f
1/f
1/f
1/f
1/f
X
X
X
X
register (WDTM). (The watchdog timer and interval timer cannot be used simultaneously.)
At f
X
: System clock oscillation frequency
X
= 12 MHz
341.3 s
682.6 s
1.36 ms
2.73 ms
Table 9-1. Loop Detection Time of Watchdog Timer
Note
At f
CHAPTER 9 WATCHDOG TIMER
X
488.8 s
977.6 s
1.96 ms
3.91 ms
= 8.38 MHz
User’s Manual U13029EJ7V1UD
Detection Time
2
2
2
2
16
17
18
20
Loop
1/f
1/f
1/f
1/f
X
X
X
X
At f
X
= 12 MHz
5.46 ms
10.9 ms
21.8 ms
87.3 ms
Note
At f
X
125.1 ms
7.82 ms
15.6 ms
31.3 ms
= 8.38 MHz
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