DSPIC30F3010-20I/SP Microchip Technology, DSPIC30F3010-20I/SP Datasheet - Page 87

• Manufacturer Part Number: DSPIC30F3010-20I/SP
• Description: IC DSPIC MCU/DSP 24K 28DIP
• Manufacturer: Microchip Technology
• Series: dsPIC™ 30Fr

Specifications of DSPIC30F3010-20I/SP

• Core Processor: dsPIC
• Core Size: 16-Bit
• Speed: 20 MIPS
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, Motor Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 20
• Program Memory Size: 24KB (8K x 24)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.300", 7.62mm)
• Core Frequency: 40MHz
• Core Supply Voltage: 5.5V
• Embedded Interface Type: I2C, SPI, UART
• No. Of I/o's: 20
• Flash Memory Size: 24KB
• Supply Voltage Range: 2.5V To 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: DSPIC30F301020ISP

13.4.2
The PWM period is specified by writing to the PRx
register. The PWM period can be calculated using
Equation
EQUATION 13-1:
PWM frequency is defined as 1/[PWM period].
FIGURE 13-1:
© 2010 Microchip Technology Inc.
PWM period = [(PRx) + 1] • 4 • Tosc •
13-1.
PWM PERIOD
OCxR = OCxRS
(Interrupt Flag)
TMR3 = PR3
T3IF = 1
PWM PERIOD
(TMRx prescale value)
PWM OUTPUT TIMING
Duty Cycle
TMR3 = Duty Cycle (OCxR)
Period
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 the figure for clarity.
TMR3 = Duty Cycle (OCxR)
- Exception 1: If PWM duty cycle is 0x0000,
- Exception 2: If duty cycle is greater than PRx,
OCxR.
dsPIC30F3010/3011
the OCx pin will remain low.
the pin will remain high.
Figure 13-1
for key PWM period comparisons.
DS70141F-page 87