SAF-XC878CM-16FFI 3V3 AC Infineon Technologies, SAF-XC878CM-16FFI 3V3 AC Datasheet - Page 90
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SAF-XC878CM-16FFI 3V3 AC
Manufacturer Part Number
SAF-XC878CM-16FFI 3V3 AC
Description
IC MCU 8BIT 64KB FLASH 64LQFP
Manufacturer
Infineon Technologies
Series
XC8xxr
Specifications of SAF-XC878CM-16FFI 3V3 AC
Core Processor
XC800
Core Size
8-Bit
Speed
27MHz
Connectivity
CAN, SPI, SSI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
40
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
3.25K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-LFQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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3.10
The Watchdog Timer (WDT) provides a highly reliable and secure way to detect and
recover from software or hardware failures. The WDT is reset at a regular interval that is
predefined by the user. The CPU must service the WDT within this interval to prevent the
WDT from causing an XC87x system reset. Hence, routine service of the WDT confirms
that the system is functioning properly. This ensures that an accidental malfunction of
the XC87x will be aborted in a user-specified time period.
In debug mode, the WDT is default suspended and stops counting. Therefore, there is
no need to refresh the WDT during debugging.
Features
•
•
•
•
•
The WDT is a 16-bit timer incremented by a count rate of
timer is realized as two concatenated 8-bit timers. The upper 8 bits of the WDT can be
preset to a user-programmable value via a watchdog service access in order to modify
the watchdog expire time period. The lower 8 bits are reset on each service access.
Figure 24
Figure 24
Data Sheet
ENWDT
ENWDT_P
16-bit Watchdog Timer
Programmable reload value for upper 8 bits of timer
Programmable window boundary
Selectable input frequency of
Time-out detection with NMI generation and reset prewarning activation (after which
a system reset will be performed)
f
PCLK
shows the block diagram of the WDT unit.
Watchdog Timer
Logic
WDT Block Diagram
1:128
1:2
f
PCLK
WDTIN
/2 or
MUX
83
f
PCLK
/128
WDT Low Byte
Control
WDT
Overflow/Time-out Control &
Window-boundary control
Clear
f
PCLK
/2 or
Functional Description
WDT High Byte
WDTWINB
WDTREL
f
PCLK
/128. This 16-bit
XC87xCLM
V1.5, 2011-03
FNMIWDT
WDTRST
.
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