XC2723X Datasheet, PDF (51/109 Pages) Infineon Technologies AG – 16/32-Bit Single-Chip Microcontroller with 32-Bit Performance

XC2723X
XC2000 Family / Econo Line
Functional Description
MultiCAN Features
• CAN functionality conforming to CAN specification V2.0 B active for each CAN node
(compliant to ISO 11898)
• Independent CAN nodes
• Set of independent message objects (shared by the CAN nodes)
• Dedicated control registers for each CAN node
• Data transfer rate up to 1 Mbit/s, individually programmable for each node
• Flexible and powerful message transfer control and error handling capabilities
• Full-CAN functionality for message objects:
– Can be assigned to one of the CAN nodes
– Configurable as transmit or receive objects, or as message buffer FIFO
– Handle 11-bit or 29-bit identifiers with programmable acceptance mask for filtering
– Remote Monitoring Mode, and frame counter for monitoring
• Automatic Gateway Mode support
• 16 individually programmable interrupt nodes
• Analyzer mode for CAN bus monitoring
3.14
System Timer
The System Timer consists of a programmable prescaler and two concatenated timers
(10 bits and 6 bits). Both timers can generate interrupt requests. The clock source can
be selected and the timers can also run during power reduction modes.
Therefore, the System Timer enables the software to maintain the current time for
scheduling functions or for the implementation of a clock.
3.15
Window Watchdog Timer
The Window Watchdog Timer is one of the fail-safe mechanisms which have been
implemented to prevent the controller from malfunctioning for longer periods of time.
The Window Watchdog Timer is always enabled after an application reset of the chip. It
can be disabled and enabled at any time by executing the instructions DISWDT and
ENWDT respectively. The software has to service the Window Watchdog Timer before
it overflows. If this is not the case because of a hardware or software failure, the Window
Watchdog Timer overflows, generating a reset request.
The Window Watchdog Timer has a ‘programmable window boundary’, it disallows
refresh during the Window Watchdog Timer’s count-up. A refresh during this window-
boundary will cause the Window Watchdog Timer to also generate a reset request.
The Window Watchdog Timer is a 16-bit timer clocked with either the system clock or the
independent wake-up oscillator clock, divided by 16,384 or 256. The Window Watchdog
Timer register is set to a prespecified reload value (stored in WDTREL) in order to allow
further variation of the monitored time interval. Each time it is serviced by the application
software, the Window Watchdog Timer is reloaded.
Data Sheet
47
V1.2, 2012-07