Accutorr Plus Service Manual 0070-10-0691 1 - 7
Theory of Operation CPU/NIBP Module Assembly with LCD Display
1.2.4.5 Micromanager
This device provides a number of features that are useful for management of this board.
They are listed as follows:
A. ON/STANDBY capability through keyboard control
B. Watchdog timer
C. Conversion of CMOS SRAM to pseudo nonvolatile memory
1.2.4.6 Battery Backup Voltage Regulator Circuitry
Implements regulation of the STANDBY VOLTAGE from the main power supply to 4V
+/- 0.2V dc with a current draw of 821 uA max.
1.2.4.7 Real Time Clock
This device provide seconds, minutes, hours, date of the month, month, and year with leap
year compensation. The device is memory mapped to be pointed to as software requires.
Also, provisions for running this device include main power supply and battery operation
in order for the RTC to keep time when the system is not powered. A lithium battery is
included, having a minimum of 10 years of operation, for configuration and clock data
retention during battery changes and main battery failure. Accuracy is +/- 1 minute/week.
1.2.4.8 Recorder Interface
IDMA capability for writing 8-bit buffered parallel data to the recorder. Handshaking
signals to specify new line to be printed, request for next byte of data.
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