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PIC12F1822-I/MF датащи(PDF) 206 Page - Microchip Technology

номер детали PIC12F1822-I/MF
подробное описание детали  8/14-Pin Flash Microcontrollers with nanoWatt XLP Technology
PDF  398 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC12F1822-I/MF датащи(HTML) 206 Page - Microchip Technology

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PIC12F/LF1822/16F/LF1823
DS41413A-page 206
Preliminary
 2010 Microchip Technology Inc.
23.3.5
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 23-4.
EQUATION 23-4:
PWM RESOLUTION
TABLE 23-4:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS (FOSC = 32 MHz)
TABLE 23-5:
EXAMPLE PWM FREQUENCIES AND RESOLUTIONS (FOSC = 20 MHz)
TABLE 23-6:
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
1
+


log
2

log
------------------------------------------ bits
=
PWM Frequency
1.95 kHz
7.81 kHz
31.25 kHz
125 kHz
250 kHz
333.3 kHz
Timer Prescale (1, 4, 16)
16
4
1
1
1
1
PR2 Value
0xFF
0xFF
0xFF
0x3F
0x1F
0x17
Maximum Resolution (bits)
10
10
10
8
7
6.6
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)
16
4
1
1
1
1
PR2 Value
0xFF
0xFF
0xFF
0x3F
0x1F
0x17
Maximum Resolution (bits)
10
10
10
8
7
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)
16
4
1
1
1
1
PR2 Value
0x65
0x65
0x65
0x19
0x0C
0x09
Maximum Resolution (bits)
8
8
8
6
5
5



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