Peripherals - Kontron CP6500-V User Manual

Functional Description
2.2

Peripherals

The following standard peripherals are available on the CP6500-V board:
2.2.1 Timer
The CP6500-V is equipped with the following timers:
• Real-time clock
The ICH4 contains a MC146818A compatible real-time clock with 256 bytes of battery-
backed RAM.
The real-time clock performs timekeeping 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 CP6500-V as defined for the PC/AT.
2.2.2 Watchdog Timer
A watchdog timer is provided, which forces either 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.
2.2.3 Battery
The CP6500-V is provided with a 3.0 V "coin cell" lithium battery for the RTC.
To replace the battery, 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.
Note ...
Care must be taken to ensure that the battery is correctly replaced.
The battery should be replaced only with an identical or equivalent type
recommended by the manufacturer.
Dispose of used batteries according to the manufacturer's instructions.
The typical life expectancy of a 170 mAh battery (VARTA CR2025) is 5 - 6
years with an average on-time of 8 hours per working day at an operating
temperature of 30°C. However, this typical value varies considerably because
the life expectancy is dependent on the operating temperature and the
standby time (shutdown time) of the system in which it operates.
To ensure that the lifetime of the battery has not been exceeded, it is recom-
mended to exchange the battery after 4 - 5 years.
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CP6500-V
ID 28945, Rev. 01