| 摘要 |
<p>PURPOSE:To accurately set the condition of an analog peripheral circuit by switching voltage to be supplied to the analog peripheral circuit even at the time of the malfunction of a microcomputer or a program. CONSTITUTION:This circuit is provided with the microcomputer 2 having a microprocessor 5 and a D/A converter 6, an electrical switch 3, the analog peripheral circuit 4 and first/second external terminals 12 and 13 and forms them on the same chip. Furthermore, the electrical switch 3 executes switch- control with power source voltage (d) from the second external terminal 13 while using the output of the D/A converter 6 and the power source voltage of the first external terminal 12 as two inputs (a) and (b) to output the result to one output terminal (c). The output terminal c is used for the control input of the analog peripheral circuit 4.</p> |
