| | Programmer and method of storing information therein and accessing information therefrom - Patent 4179748 |
 | | Control words are supplied to the I/O register 42 either from the encoder 36 via the register control circuit 37 or from the register control circuit 37 in response to instructions supplied thereto from the main control circuit 39. |
 | | The main control circuit 39 acts on all of the inputs supplied to it during one phase signal, the input phase signal, of the clock 69 and generates outputs during a second phase signal, the output phase signal, from the clock 69, which outputs are generated on the lines 33, 61 and 41. |
 | | When a key is initially closed, the output of the OR gate 63 will remain at a low level for a predetermined time period, during which time either the key bounce circuit in the arithmetic unti 22 or the key bounce circuit 64 validates the occurance of such a key closure. |
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