| 摘要 |
<p>PURPOSE:To eliminate the need of an external circuit for interrupt function extension to reduce cost by writing prescribed digital data in a memory for terminal number change having the external interrupt function to change the terminal number of a terminal having the external interrupt function. CONSTITUTION:An interrupt input INT1 of a terminal 1 is effective when a flag T0 of a memory 13 for interrupt terminal number change is in the high level, and an interrupt input A0 of a terminal 14 is effective when the flag T0 is in the low level. Only the interrupt input function is shifted but the input of INT1 and A0 to another circuit is not switched. Thus, the external interrupt function of an MPU can be shifted to apparently increase the number of terminals having the external interrupt function, and all the external circuits required for this increase are unnecessary, and the space is reduced and the cost is reduced.</p> |
