| 摘要 |
<p>PURPOSE:To react even a key input with feeling of feather touch and to dispense with software which discriminates by which key input the standby is released by generating a vector address by code-converting a key return signal, and setting it on a program counter. CONSTITUTION:When the key return signal by the key operation of a keyboard 2 is inputted, an OR gate 14 outputs a standby release signal S2, and a built-in oscillation circuit not shown in figure is started to operate. Also, a leading edge detector 15 outputs a signal S3, and the conversion data of a decoder 13 is set at the program counter 11, and the data of the program counter 11 is latched at a PC latch 12. Then, the execution of a program is transferred to the vector address generated by the decoder 13, and an operation to accept the key return signal, etc., is performed. Thereby, it is possible to react according to even the key input with feather touch, and to dispense with the software to discriminate by which key input the release of the standby is performed.</p> |
