| 摘要 |
PURPOSE: To provide a circuit and method for computer reset control which inhibit a CPU from being reset in its operation state wherein the CPU must not be reset and reset the CPU forcibly even in its runaway state need. CONSTITUTION: This circuit consists of an external circuit which sends a reset command out to a data line 16 as a serial signal, a shift register 13 which latches and transfers the pattern of the serial signal on the data line 16, a watchdog circuit 15 which monitor the change of the signal at the output port lid of a CPU 11a and outputs the result, and a comparator 14 which compares a pattern formed of a combination of a previous set fixed pattern and the output signal of the watchdog circuit 15 with the pattern of the serial signal transferred from the shift register 13 and generates a reset signal 17 for resetting a computer equipment 11 when they match each other. |
