DSPIC30F2011T-20E/ML Microchip Technology, DSPIC30F2011T-20E/ML Datasheet - Page 89

• Manufacturer Part Number: DSPIC30F2011T-20E/ML
• Description: IC DSPIC MCU/DSP 12K 28QFN
• Manufacturer: Microchip Technology
• Series: dsPIC™ 30Fr

Specifications of DSPIC30F2011T-20E/ML

• Core Processor: dsPIC
• Core Size: 16-Bit
• Speed: 20 MIPS
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 12
• Program Memory Size: 12KB (4K x 24)
• Program Memory Type: FLASH
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 8x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• For Use With: DAF30-4 - DEVICE ATP FOR ICE4000
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

12.4.2
The PWM period is specified by writing to the PRx
register. The PWM period can be calculated using
Equation
EQUATION 12-1:
PWM frequency is defined as 1/[PWM period].
FIGURE 12-2:
© 2010 Microchip Technology Inc.
PWM period = [(PRx) + 1] • 4 • Tosc •
12-1.
PWM PERIOD
OCxR = OCxRS
(Interrupt Flag)
TMR3 = PR3
T3IF = 1
(TMRx prescale value)
PWM OUTPUT TIMING
Duty Cycle
dsPIC30F2011/2012/3012/3013
Period
TMR3 = Duty Cycle
(OCxR)
OCxR = OCxRS
(Interrupt Flag)
TMR3 = PR3
T3IF = 1
When the selected TMRx is equal to its respective
period register, PRx, the following four events occur on
the next increment cycle:
• TMRx is cleared.
• The OCx pin is set.
• The PWM duty cycle is latched from OCxRS into
• The corresponding timer interrupt flag is set.
See
Timer3 is referred to in
- Exception 1: If PWM duty cycle is 0x0000,
- Exception 2: If duty cycle is greater than PRx,
OCxR.
TMR3 = Duty Cycle
the OCx pin remains low.
the pin remains high.
Figure 12-2
(OCxR)
for key PWM period comparisons.
Figure 12-2
for clarity.
DS70139G-page 89