| 摘要 |
<p>PURPOSE:To simplify program development and to shorten a development period by using a power supply terminal for writing, one data input/output terminal and one clock input terminal. CONSTITUTION:This microcomputer is provided with a PROM 19, the power supply terminal 11 for the writing for supplying a writing instruction to the PROM 19, a potential detection part 14 for detecting the input operation of the power supply terminal 11 for the writing, a mode control part 17 for deciding an operation mode based on information outputted by the potential detection part 14, a counter part 27 for counting input clocks from the clock input terminal 13, a program counter 18 for updating a storage value with the output signals of the counter part 27, an initialization circuit 26 for initializing the program counter 18 corresponding to the prescribed states of the data input/ output terminal 12 and the clock input terminal 13 and the read control part 15 of the PROM 19 and the write control part 16 of the PROM 19 for controlling the read and write to the PROM 19 by the mode control part 17.</p> |
