tle8261-2e Infineon Technologies Corporation, tle8261-2e Datasheet - Page 46

• Manufacturer Part Number: tle8261-2e
• Description: Universal System Basis Chip Hermes
• Manufacturer: Infineon Technologies Corporation

Figure 19
Figure 20
10.2.3
The settings of the watchdog can be changed during the operation of the watchdog. The change is done with a
SPI programming into the Watchdog Configuration Register. The new setting is programmed together with a valid
watchdog trigger according to the old settings. The timer with the new settings starts with this SPI command. The
toggling of the “WD Refresh” bit needs to be continued (transition HIGH to LOW or LOW to HIGH) with the new
settings.
If the new settings were not valid, the watchdog will continue with the old settings and generate a “Wrong WD Set”
interrupt.
Data Sheet
Refresh
WD
RO
bit
timer reset
Watchdog
t
CWmin
Window Watchdog Definitions
Window Watchdog Timing Diagram for config 1 and config 3
Changing the Watchdog Settings
t
CW
closed window
t
OW
operation
t
CW
normal
t
CWmax
Window Watchdog Timing (SPI)
t
OW
t
WD
t
CW
+t
OW
0.45
certainty
Un-
(too long)
t
Time-out
WDR
0.55
t
LW
46
safe trigger area
open window
t
LW
t
OWmin
operation
normal
t
CW
t
OWmax
t
OW
t
CW
(too short)
0.9
timeout
Supervision Functions
uncertainty
t
LW
Rev. 1.0, 2009-05-26
t
1.0
CW
Wd1_per .vsd
operation
TLE8261-2E
t
OW
normal
Wd2_per.vsd
1.1
t /
[t
WDPER
t
t
]