CP302
Functional Description and Configuration
ID 21112, Rev. 05
Page 2 - 9
®
PEP Modular Computers GmbH
2.5 Peripherals
The following standard peripherals are available on the CP302 board:
•
Real-Time Clock
The real-time clock performs time-keeping functions and includes 256 bytes of
general purpose battery-backed CMOS RAM. Features include an alarm function,
programmable periodic interrupt and a 100-year calendar. All battery-backed
CMOS RAM data remains stored in an additional EEPROM. This prevents data
loss.
•
Counter/Timer
Three 8254-style counter/timers are included on the CP302 as defined for the PC/AT.
2.5.1
Watchdog Timer
A watchdog timer is provided, which forces an IRQ5, NMI or Reset condition
(configurable in the watchdog register). The watchdog time can be programmed in 12
steps ranging from 125 msec up to 256 seconds. If the watchdog timer is enabled, it
cannot be stopped.
2.5.2
Battery
The CP302 is provided with a 3.0V “coin cell” lithium battery for the RTC.
To replace the battery please proceed as follows:
•
Turn off power
•
Remove the battery
•
Place the new battery in the socket.
•
Make sure that you insert the battery the right way round. The plus pole must be on
the top!
The lithium battery must be replaced with an identical battery or a battery type
recommended by the manufacturer. Suitable batteries include the VARTA CR2025 and
PANASONIC BR2020
Important notes concerning the battery appear on the next page
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