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1

Those solutions may work, especially if carefully evaluated. Make sure that the impedance mismatch at the resistor bridges is acceptable and you do not solder the first connector at all, if you add the resistors. Something that may work even better are cuttable traces. Use CON#2 by default, but replace the resistors with standard traces. Once you switch to ...


2

The instruction set is the interface specification -- given a word of the value x, the ARM CPU will do y. The architecture is an implementation of this interface. There can be different implementations, but the one by ARM Ltd. has been developed along the interface specification and is most likely one of the best optimized ones. The instruction set has ...


3

A pure micro-controller has the memory busses (the wires and logic that connect the CPU to its ROM, RAM and peripherals) internally, hence there are no wires to connect an external ROM or RAM to. You are stuck with whatever ROM and RAM the manufacturer has included in the chip version that you are using. In most cases the manufacturer offers a range of ...


1

The PS/2 keyboard is very easy to interface, and a PC/XT keyboard (with the 5 pin DIN connector) is even easier. For the PC/XT keyboard you just need a 8-bit serial-to-parallel shift register. The keyboard will automatically clock out a 9-bit key scan code for each key press and release; you can connect the keyboard clock signal to the clock in pin of the ...


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The timing would depend primarily on the capacitive load on each logic gate, which would include both the wiring capacitance and the capacitance of the MOSFET gate(s) you're driving. For example, the 2N7000 has an input capacitance of 20 pF typical (50 pF max). If your average fanout is 3, plus some wiring capacitance, that gives you a typical load of 100 - ...



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