Microchip Technology dsPIC30F - Page 303

© 2004 Microchip Technology Inc. DS70061C-page 14-21
Section 14. Output Compare
Output
Compare
14
Figure 14-11: PWM Output Timing
Table 14-3: Example PWM Frequencies and Resolutions at 10 MIPs (F
OSC = 40 MHz)
Table 14-4: Example PWM Frequencies and Resolutions at 30 MIPs (F
OSC = 120 MHz)
PWM Frequency 19 Hz 153 Hz 305 Hz 2.44 kHz 9.77 kHz 78.1 kHz 313 kHz
Timer Prescaler Ratio 8 1 1 1 1 1 1
Period Register Value 0xFFFF 0xFFFF 0x7FFF 0x0FFF 0x03FF 0x007F 0x001F
Resolution (bits) 16 16 15 12 10 7 5
PWM Frequency 57 Hz 458 Hz 916 Hz 7.32 kHz 29.3 kHz 234 kHz 938 kHz
Timer Prescaler Ratio 8 1 1 1 1 1 1
Period Register Value 0xFFFF 0xFFFF 0x7FFF 0x0FFF 0x03FF 0x007F 0x001F
Resolution (bits) 16 16 15 12 10 7 5
0002
0000 0001 0002 00030005
TMR3
0001
1 Instruction Clock Period
0005
0002
PR3
OCxR
0005
OCx pin
0002
OCxRS
0000
00050003
0004
0004
0001
New Value Written to OCxRS
0001
New Duty Cycle Loaded Here
Note 1: An ‘x’ represents the output compare channel number. A ‘y’ represents the time base number.
2: OCxR = Compare Register, OCxRS = Secondary Compare Register.
TyIF is Set
OCxR = OCxRS
TyIF is Set
OCxR = OCxRS