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VSC056 Datasheet(PDF) 87 Page - Maxim Integrated Products |
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VSC056 Datasheet(HTML) 87 Page - Maxim Integrated Products |
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87 / 134 page  87 of 134 VSC056 Data Sheet Revision 4.1 January 2008 3.2.79 98h-9Fh: Pulse-Width Modulation Control (PWMC0-PWMC7) These eight registers provide a pulse-width modulated output that can optionally be made available on each of the Port 1 I/O pins. Configurations for these I/O pins that may have been previously enabled through other control registers are overridden if either one or both of the PWBF bits are set. The PWBF bits have higher priority control over the Port 1 I/O pins than any other mode of operation. The pulse-width modulated outputs are based on a 32-step counter and provide values from a 3.125% to a 100% duty cycle in 3.125% increments. The following table shows the bit assignments for the Pulse-Width Modulation Control registers. The following table shows the available percentages of high time for the pulse width for the PWP4-0 bits. Register Name: PWMC0-PWMC7 Address: 98h-9Fh Reset Value: X000_0000b Bit Bit Label Access Description 6:5 PWBF1-0 R/W Pulse-Width Base Frequency These two bits determine the base operating frequency of the pulse-width modulated output. These frequencies vary with the input clock rate and are nominally based on a 10.0 MHz clock source. The available base frequencies are as follows. 4:0 PWP4-0 R/W Pulse-Width Percentage These five bits determine the percentage of high time that the output pulse contains. There are 32 steps that can be adjusted in 3.125% increments. For the available percentages of high time, see Table 7, page 87. Table 7. Pulse-Width Percentages PWP4 PWP3 PWP2 PWP1 PWP0 Pulse-Width Percentage 0 0 0 0 0 3.125% on/high time 0 0 0 0 1 6.25% on/high time 0 0 0 1 0 9.375% on/high time 0 0 0 1 1 12.5% on/high time 0 0 1 0 0 15.625% on/high time 0 0 1 0 1 18.75% on/high time 0 0 1 1 0 21.875% on/high time 0 0 1 1 1 25.0% on/high time 0 1 0 0 0 28.125% on/high time 0 1 0 0 1 31.25% on/high time 0 1 0 1 0 34.375% on/high time 0 1 0 1 1 37.5% on/high time 0 1 1 0 0 40.625% on/high time PWBF1 PWBF0 Pulse-Width Base Frequency 0 0 Normal operation—control is provided through GPD1/DDP1 or BCP1 0 1 26 kHz base frequency 1 0 52 kHz base frequency 1 1 104 kHz base frequency |
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