sak-xc888clm-8ffa Infineon Technologies Corporation, sak-xc888clm-8ffa Datasheet - Page 76
sak-xc888clm-8ffa
Manufacturer Part Number
sak-xc888clm-8ffa
Description
High Performance 8-bit Microcontroller With On-chip Flash Memory And Can
Manufacturer
Infineon Technologies Corporation
Datasheet
1.SAK-XC888CLM-8FFA.pdf
(119 pages)
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If the WDT is not serviced before the timer overflow, a system malfunction is assumed.
As a result, the WDT NMI is triggered (assert WDTTO) and the reset prewarning is
entered. The prewarning period lasts for 30
(assert WDTRST).
The WDT has a “programmable window boundary” which disallows any refresh during
the WDT’s count-up. A refresh during this window boundary constitutes an invalid
access to the WDT, causing the reset prewarning to be entered but without triggering the
WDT NMI. The system will still be reset after the prewarning period is over. The window
boundary is from 0000
00
After being serviced, the WDT continues counting up from the value (<WDTREL> * 2
The time period for an overflow of the WDT is programmable in two ways:
• the input frequency to the WDT can be selected to be either f
• the reload value WDTREL for the high byte of WDT can be programmed in register
The period, P
by the following formula:
If the Window-Boundary Refresh feature of the WDT is enabled, the period P
between servicing the WDT and the next overflow is shortened if WDTWINB is greater
than WDTREL, see
replacing WDTREL with WDTWINB. For this feature to be useful, WDTWINB should not
be smaller than WDTREL.
Figure 30
Data Sheet
Prelimary
H
WDTREL
.
WDT
WDT Timing Diagram
, between servicing the WDT and the next overflow can be determined
P
Figure
WDT
H
WDTWINB
FFFF
WDTREL
to the value obtained from the concatenation of WDTWINB and
=
H
30. This period can be calculated using the same formula by
2
----------------------------------------------------------------------------------------------------- -
Count
(
1
+
WDTIN
No refresh
allowed
×
6
72
)
×
H
f
(
Refresh allowed
PCLK
2
count, after which the system is reset
16
–
WDTREL
Functional Description
×
time
PCLK
2
8
)
/2 or f
XC886/888CLM
PCLK
V0.1, 2006-02
/128
WDT
8
).
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