PIC24HJ128GP206-I Datasheet, PDF (145/286 Pages) Microchip Technology – High-Performance, 16-Bit Microcontrollers

PIC24HJXXXGPX06/X08/X10
TABLE 14-1: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 4 MIPS (FCY = 4 MHz)
PWM Frequency
7.6 Hz
61 Hz
122 Hz 977 Hz 3.9 kHz 31.3 kHz 125 kHz
Timer Prescaler Ratio
Period Register Value
Resolution (bits)
8
FFFFh
16
1
FFFFh
16
1
7FFFh
15
1
0FFFh
12
1
03FFh
10
1
007Fh
7
1
001Fh
5
TABLE 14-2: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 16 MIPS (FCY = 16 MHz)
PWM Frequency
30.5 Hz 244 Hz 488 Hz 3.9 kHz 15.6 kHz 125 kHz 500 kHz
Timer Prescaler Ratio
Period Register Value
Resolution (bits)
8
FFFFh
16
1
FFFFh
16
1
7FFFh
15
1
0FFFh
12
1
03FFh
10
1
007Fh
7
1
001Fh
5
TABLE 14-3: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS AT 40 MIPS (FCY = 40 MHz)
PWM Frequency
76 Hz
610 Hz 1.22 Hz 9.77 kHz 39 kHz 313 kHz 1.25 MHz
Timer Prescaler Ratio
Period Register Value
Resolution (bits)
8
FFFFh
16
1
FFFFh
16
1
7FFFh
15
1
0FFFh
12
1
03FFh
10
1
007Fh
7
1
001Fh
5
FIGURE 14-1:
OUTPUT COMPARE MODULE BLOCK DIAGRAM
Set Flag bit
OCxIF⁽¹⁾
OCxRS⁽¹⁾
OCxR⁽¹⁾
Comparator
Output
Logic
3
OCM2:OCM0
Mode Select
0
1
OCTSEL
0
1
16
16
SQ
R
OCx⁽¹⁾
Output Enable
OCFA or OCFB⁽²⁾
TMR register inputs
from time bases⁽³⁾
Period match signals
from time bases⁽³⁾
Note 1: Where ‘x’ is shown, reference is made to the registers associated with the respective output compare channels
1 through 8.
2: OCFA pin controls OC1-OC4 channels. OCFB pin controls OC5-OC8 channels.
3: Each output compare channel can use one of two selectable time bases. Refer to the device data sheet for the
time bases associated with the module.
Note: Only OC1 and OC2 can trigger a DMA data transfer.
© 2007 Microchip Technology Inc.
DS70175F-page 143