DSPIC30F2020-30I/SP Microchip Technology, DSPIC30F2020-30I/SP Datasheet - Page 15

• Manufacturer Part Number: DSPIC30F2020-30I/SP
• Description: IC DSPIC MCU/DSP 12K 28DIP
• Manufacturer: Microchip Technology
• Series: dsPIC™ 30Fr

Specifications of DSPIC30F2020-30I/SP

• Package / Case: 28-DIP (0.300", 7.62mm)
• Core Processor: dsPIC
• Core Size: 16-Bit
• Speed: 30 MIPs
• Connectivity: I²C, IrDA, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 21
• Program Memory Size: 12KB (4K x 24)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Mounting Style: Through Hole
• 3rd Party Development Tools: 52713-733, 52714-737, 53276-922, EWDSPIC
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE4000, DM240002, DM300027, DM330011, DM300018, DM183021
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: DM300023 - KIT DEMO DSPICDEM SMPS BUCKDV164005 - KIT ICD2 SIMPLE SUIT W/USB CABLE
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

34. Module: PWM Override Priority
EQUATION 4:
35. Module: CPU –
EXAMPLE 3:
© 2008 Microchip Technology Inc.
L0:daw.b
L1: ....
The “dsPIC30F1010/202X Device Data Sheet”
(DS70178) states the priority of PWMx pin
ownership as:
• PWM Generator (lowest priority)
• Output Override
• Current-Limit Override
• Fault Override
• PENx (GPIO/PWM) ownership (highest priority)
Instead of following the above priority scheme, the
PWMx pin ownership is determined by ANDing the
Output Override Data bits (OVRDAT<1:0>),
Current-Limit Override Data bits (CLDAT<1:0>),
and Fault Override Data bits (FLTDAT<1:0>) in the
IOCONx register.
The Decimal Adjust instruction, DAW.b, may
improperly clear the Carry bit, C (SR<0>), when
executed.
Work around
Check the state of the Carry bit prior to executing
the DAW.b instruction. If the Carry bit is set, set the
Carry bit again after executing the DAW.b
instruction. Example 3 shows how the application
should process the Carry bit during a BCD addition
operation.
.include “p30fxxxx.inc”
.......
mov.b
mov.b
add.b
bra
daw.b
bset.b SR, #C
bra
#0x80, w0
#0x80, w1
w0, w1, w2 ;Perform addition
NC, L0
w2
L1
w2
PWMxH = (OVRDAT<1>) AND (CLDAT<1>) AND (FLTDAT<1>) = 0 AND 0 AND 1 = 0
PWMxL = (OVRDAT<0>) AND (CLDAT<0>) AND (FLTDAT<0>) = 0 AND 1 AND 0 = 0
CHECK CARRY BIT BEFORE
DAW.b
DAW.b
;First BCD number
;Second BCD number
;If C set go to L0
;If not, do DAW and
;set the carry bit
;and exit
instruction
dsPIC30F1010/202X
For example, the override data may be set as
follows:
• OVRDAT<1:0> = 00
• CLDAT<1:0> = 01
• FLTDAT<1:0> = 10
If all three overrides occur simultaneously, the
following operations shown in Equation 4 will
determine the state of the PWMx pin.
Therefore,
simultaneously, only the override data for the
active override sources will be ANDed together
while the inactive override sources will be ignored.
If only one override is active, override priorities do
not apply and operation of the PWM overrides is
normal.
Work around
None.
when
multiple
overrides
DS80290J-page 15
occur