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HCTL1100 Datasheet(PDF) 21 Page - Agilent(Hewlett-Packard) |
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HCTL1100 Datasheet(HTML) 21 Page - Agilent(Hewlett-Packard) |
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21 / 40 page  21 PWM Motor Command Register (R09H) The PWM port outputs the motor command as a pulse width modulated signal with the correct sign of polarity. The PWM port consists of the Pulse and Sign pins and R09H. The PWM signal at the Pulse pin has a frequency of External Clock/100 and the duty cycle is (–40D) gives a 40% duty cycle signal at the Pulse pin and forces the Sign pin high. Data outside the 64H (+100D) to 9CH (–100D) linear range gives 100% duty cycle. R09H can be read and written to. However, the user should only write to R09H when the controller is in the Initiali- zation/Idle mode. Figure 5 shows the PWM output versus the internal motor command. Figure 4. Motor Command Port Output. resolved into the 100 clocks. (For example, a 2 MHz clock gives a 20 KHz PWM frequency.) The Sign pin gives the polarity of the command. Low output on Sign pin is positive polarity. The 2’s-complement contents of R09H determine the duty cycle and polarity of the PWM command. For example, D8H |
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