Datum bc630AT, User Manual

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CHAPTER ONE
1-2 bc630AT Real Time Clock Module Datum Inc
•
Provides a rate programmable heartbeat pulse/interrupt (1-2000 Hz) synchronized to the time
source.
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Provides programmable propagation delay compensation.
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It's 16 byte I/O block can be located on any one of 48 I/O blocks in the 100H - 3FFH AT I/O
address space.
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Drives Datum’s optional LED display modules with the decoded time.
1.2 PHYSICAL AND FUNCTIONAL OVERVIEW
The bc630AT is a half height IBM XT/AT bus board designed to provide a precision real time clock,
decode serial time code signals, digitally synchronize multiple PC's and provide a number of other
valuable timing features. The bc630AT also incorporates a battery backed real time clock IC which
maintains settable time during power loss and can be synchronized to an external time code signal. The
real time clock can also be decoded with microsecond precision.
The operation of the bc630AT is controlled by sixteen 8-bit registers written and read by the host
XT/AT computer. These registers are used for defining the time source the bc630AT decodes, mode
of operation, setting and reading the real time clock, activating time capture operations, holding the
captured time and status; defining the heartbeat frequency, and defining the propagation delay
compensation value.
1.3 PERFORMANCE SPECIFICATIONS
The principal performance characteristics are listed in Table 1-1, on the following page.
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