PIC18F23K20-ESLASHML datasheet(151/456 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS41303G-page 151

PIC18F2XK20/4XK20

11.4.3

PWM RESOLUTION

The resolution determines the number of available duty

cycles for a given period. For example, a 10-bit resolution

will result in 1024 discrete duty cycles, whereas an 8-bit

resolution will result in 256 discrete duty cycles.

The maximum PWM resolution is 10 bits when PR2 is

255. The resolution is a function of the PR2 register

value as shown by Equation 11-4.

EQUATION 11-4:

PWM RESOLUTION

TABLE 11-4:

EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 40 MHz

TABLE 11-5:

EXAMPLE PWM FREQUENCIES AND RESOLUTIONS (FOSC = 20 MHz)

TABLE 11-6:

EXAMPLE PWM FREQUENCIES AND RESOLUTIONS (FOSC = 8 MHz)

Note:

If the pulse width value is greater than the

period the assigned PWM pin(s) will

remain unchanged.

Resolution

4PR2





log



log

------------------------------------------ bits

PWM Frequency

2.44 kHz

9.77 kHz

39.06 kHz

156.25 kHz

312.50 kHz

416.67 kHz

Timer Prescaler (1, 4, 16)

41111

PR2 Value

FFh

3Fh

1Fh

17h

Maximum Resolution (bits)

6.58

PWM Frequency

1.22 kHz

4.88 kHz

19.53 kHz

78.12 kHz

156.3 kHz

208.3 kHz

Timer Prescale (1, 4, 16)

PR2 Value

0xFF

0x3F

0x1F

0x17

Maximum Resolution (bits)

6.6

PWM Frequency

1.22 kHz

4.90 kHz

19.61 kHz

76.92 kHz

153.85 kHz

200.0 kHz

Timer Prescale (1, 4, 16)

PR2 Value

0x65

0x19

0x0C

0x09

Maximum Resolution (bits)

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