| 摘要 |
PURPOSE:To recognize whether a program is executed to the last by resetting a program counter at a prescribed time, and resetting a flag when the program is not executed to the last. CONSTITUTION:The program counter (OC) 105 inputs the output of a reset signal input 107, resets the content of PC 105 to zero by the edge of a reset signal and adds the content of PC 105 by one when the content of a program memory for one address is decoded in a decoder 104. A signal inputted to the reset input 107 at that time is a signal showing a sampling period and a waveform is square with one period per sampling period. Its duty is 50%. The flag 109 is reset when a logically last instruction showing the last of the program in the program memory is executed. Since the flag is reset if the program is executed to the last, it can be recognized whether the program is executed to the last by a flag output 102. |
