Hot-selling and scarce MC68230FN8 Parallel Interface/Timer PLCC spot stock

Product Descriptions

The MC68230 parallel interface/timer (PI/T) provides versatile double-bufferedparallel interfaces and a system-oriented timer for MC68000 systems. The par-allel interfaces operate in unidirectional or bidirectional modes, either 8 or  bidirectional modes, either 8 or 16bits wide. In the unidirectional modes, an associated data direction registerdetermines whether each port pin is an input or output. In the bidirectionalmodes, the data direction registers are ignored, and the direction is determineddynamically by the state of four handshake pins. These programmable hand-shake pins provide an interface flexible enough for connection to a wide varietyof low-, medium-, or high-speed peripherals or other computer systems. ThePI/T ports allow use of vectored or autovectored interrupts, and also providea direct memory access (DMA) request pin for connection to the MC68450 directmemory access controller (DMAC) or a similar circuit. The PI/T timer containsa 24-bit-wide counter and a 5-bit prescaler. The timer may be clocked by thesystem clock (PI/T CLK pin) or by an external clock (TIN pin), and a 5-bit prescalercan be used. The PI/T can generate periodic interrupts, a square wave, or asingle interrupt after a programmed time period; it can also be used for elapsedtime measurement or as a device watchdog.

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