ABB DSQC1018 3HAC050363-001 Computer

Detailed

ABB DSQC1018 3HAC050363-001 Computer

DSQC1018 3HAC050363-001 and data counting capabilities are provided by a triple 16-bit programmable timer/counter (Intel 8254) which is controlled by the Timer/Counter Registers at board addresses $0020 to $0026. Interval Timer Register TR0 is driven by an 6.25 MHz clock, and TR1 is driven by the output of TR0. The Data Counter Register (DCR) operates independently of the two timers, and is used to monitor the progress of data through the buffer. Operating modes and data transfers for all three counters are controlled by the Timer Control Register (TCR). All timer/counter data transfers are 8 bits wide and use data bits D0 to D7. Two data transfers are required to read or write each 16-bit counter, with the least significant byte transferred first and the most significant byte transferred second. The control word determines the type of transfer, and must be written to the timer/counter before each data transfer. Table 3-20 on page 71 lists the data transfer sequences for the timers and counter. Details concerning the Intel 8254 counter and programming requirements can be obtained from Intel. However, the information in this manual should be adequate.

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