| 摘要 |
PURPOSE:To vary a pulse width at a high speed. CONSTITUTION:An incremental-decremental counter 11 is provided in a front stage of a data latch circuit 1 of a PWM circuit A. An 'H' zone set data and an 'L' zone set data are preset in the counter 11 from a microprocessor. A content of the counter 11 is imcrementally or decrementally counted by a clock signal CLK at each one period of a machine cycle, and its value is input to the circuit 1. Accordingly, data of the microprocessor may be only an initial value. It can output without depending upon the machine cycle of the microprocessor, and can vary a pulse width at a high speed. |
