| 摘要 |
PROBLEM TO BE SOLVED: To make a real time output circuit for DC brushless motor respond at a high speed without being affected by interruption processing holding time, software processing time of a CPU, etc., by incorporating a selection circuit for selecting an external interruption signal as a transfer trigger in addition to the output signal of a timer in the output circuit. SOLUTION: A real time output circuit is constituted so that the circuit can transfer the content of a slave buffer register 9, namely, the OFF pattern of an PWM to an output latch 12 when an external interruption signal 14 is supplied to the register 9 or the content of another slave buffer register 22, namely, a fail-safe output pattern to the output latch 12 when another external interrupt signal 15 is supplied to the resistor 22. The hardware of the output circuit can be constituted so that a fail-safe output can be made by means of the interrupt signal 15 when the output of the PWM is turned off by using the interrupt signal 14. Therefore, the speed of response of the output circuit can be increased regardless of the speed of response to interruption and processing speed of the output circuit. |
