| 摘要 |
<p>PURPOSE:To rewrite the program stored in a read only memory mounted on a substrate. CONSTITUTION:When a program and data will be written in an SRAM 7, a signal is given to a mode switching terminal 9. A reception part UART 2 is made receivable in accordance with the program in an incorporated mask ROM 5 by the indication from the mode switching terminal 9, and the program and data from a host computer 1 are received by the UART 2 and are written in the SRAM 7. Thus, the program in the read only memory mounted on the substrate is rewritten.</p> |
