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In either mode, a timer can generate an interrupt when it has counted down to zero. Timer 2 functions as an interval counter or a pulse counter. If operating as an interval counter, timer 2 is driven by the microprocessor's PHI2 clock source. As a pulse counter, timer 2 is triggered by an external pulse source on the chip's PB6 line.
A circuit decade counter using JK Flip-flops (74LS112D) A decade counter counts in decimal digits, rather than binary. A decade counter may have each (that is, it may count in binary-coded decimal, as the 7490 integrated circuit did) or other binary encodings. A decade counter is a binary counter designed to count to 1001 (decimal 9).
16-bit counter/timer unit; 2 match/count/capture registers allowing the implementation of a pulse generator, event counter or reference timer; Clock generator; Differences from the Motorola 68000 core include these: Instruction execution timing is completely different; Interrupt handling has been simplified; The SCC68070 has MC68010 style bus ...
Among them were the Z80 CTC (counter/timer), Z80 DMA [15] (direct memory access), Z80 DART (dual asynchronous receiver–transmitter), Z80 SIO (synchronous communication controller), and Z80 PIO (parallel input/output). The Z80 was officially launched in July 1976. [16] One of the first customers was a buyer who, unknown to Zilog, worked for NEC.
The following is a list of 7400-series digital logic integrated circuits. ... 4-digit timer counter/display driver (up to 9599, intended as time elapsed, i.e. 9:59.9 ...
The timer may switch equipment on, off, or both, at a preset time or times, after a preset interval, or cyclically. A countdown time switch switches power, usually off, after a preset time. A cyclical timer switches equipment both on and off at preset times over a period, then repeats the cycle; the period is usually 24 hours or 7 days.
These circuits measure the fraction of a clock period: that is, the time between a clock event and the event being measured. The interpolation circuits often require a significant amount of time to perform their function; consequently, the TDC needs a quiet interval before the next measurement.
Counter/Selector (separate-cathode) dekatrons have each cathode wired to its own pin; therefore their bases have at least 13 pins. Selectors allow for monitoring the status of each cathode or to divide-by-n with the proper reset circuitry. This kind of versatility made such dekatrons useful for numerical division in early calculators.
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