MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 172

• Manufacturer Part Number: MC-78F0712-KIT
• Description: KIT REF SYSTEM 78K0 UPD78F0712
• Manufacturer: Renesas Electronics America

Specifications of MC-78F0712-KIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.1
signal is generated.
For details of RESF, see CHAPTER 18 RESET FUNCTION.
low-speed oscillator as shown in Table 9-2.
170
The watchdog timer is used to detect an inadvertent program loop. If a program loop is detected, an internal reset
When a reset occurs due to the watchdog timer, bit 4 (WDTRF) of the reset control flag register (RESF) is set to 1.
The operation mode of the watchdog timer (WDT) is switched according to the option byte setting of the internal
Functions of Watchdog Timer
f
f
f
f
f
f
f
f
RL
RL
RL
RL
RL
RL
RL
RL
/2
/2
/2
/2
/2
/2
/2
/2
During Internal Low-speed Oscillation Clock Operation
11
12
13
14
15
16
17
18
Remarks 1. f
2. f
Table 9-1. Loop Detection Time of Watchdog Timer
8.53 ms
17.07 ms
34.13 ms
68.27 ms
136.53 ms
273.07 ms
546.13 ms
1.09 s
RL
XP
At f
: Internal low-speed oscillation clock oscillation frequency
: X1 input clock oscillation frequency
RL
CHAPTER 9 WATCHDOG TIMER
= 240 kHz (TYP.)
User’s Manual U17890EJ2V0UD
Loop Detection Time
f
f
f
f
f
f
f
f
XP
XP
XP
XP
XP
XP
XP
XP
/2
/2
/2
/2
/2
/2
/2
/2
13
14
15
16
17
18
19
20
During X1 Input Clock Operation
409.6 s
819.2 s
1.64 ms
3.28 ms
6.55 ms
13.11 ms
26.21 ms
52.43 ms
At f
XP
= 20 MHz
512 s
1.02 s
2.04 ms
4.09 ms
8.19 ms
16.38 ms
32.77 ms
65.54 ms
At f
XP
= 16 MHz