PIC18F4431-E/ML Microchip Technology, PIC18F4431-E/ML Datasheet - Page 192

• Manufacturer Part Number: PIC18F4431-E/ML
• Description: IC MCU FLASH 8KX16 44QFN
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18F4431-E/ML

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, LVD, Power Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 36
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 4.2 V ~ 5.5 V
• Data Converters: A/D 9x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F2331/2431/4331/4431
REGISTER 18-5:
18.7.2
The amount of dead time provided by the dead-time
unit is selected by specifying the input clock prescaler
value and a 6-bit unsigned value defined in the DTCON
register. Four input clock prescaler selections have
been provided to allow a suitable range of dead times
based on the device operating frequency. F
F
options available using the DTPS<1:0> control bits in
the DTCON register.
After selecting an appropriate prescaler value, the
dead time is adjusted by loading a 6-bit unsigned value
into DTCON<5:0>. The dead-time unit prescaler is
cleared on any of the following events:
• On a load of the down timer due to a duty cycle
• On a write to the DTCON register; or
• On any device Reset.
DS39616D-page 192
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7-6
bit 5-0
OSC
comparison edge event;
DTPS1
R/W-0
/4, F
OSC
DEAD-TIME RANGES
DTPS<1:0>: Dead-Time Unit A Prescale Select bits
11 = Clock source for dead-time unit is F
10 = Clock source for dead-time unit is F
01 = Clock source for dead-time unit is F
00 = Clock source for dead-time unit is F
DT<5:0>: Unsigned 6-Bit Dead-Time Value for Dead-Time Unit bits
/8 and F
DTPS0
R/W-0
DTCON: DEAD-TIME CONTROL REGISTER
OSC
/16 are the clock prescaler
W = Writable bit
‘1’ = Bit is set
R/W-0
DT5
R/W-0
OSC
DT4
/2,
OSC
OSC
OSC
OSC
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
/16
/8
/4
/2
R/W-0
DT3
18.7.3
The dead-time counter is clocked from any of the Q
clocks based on the following conditions.
1.
2.
3.
4.
The dead-time counter is clocked on Q1 when:
• The DTPS bits are set to any of the following
• The PWM Time Base Prescale bits
The dead-time counter is clocked by a pair of Q
clocks when the PWM Time Base Prescale bits
are set to 1:1 (PTCKPS<1:0> = 00, F
the dead-time counter is clocked by the F
(DTPS<1:0> = 00).
The dead-time counter is clocked using every
other Q clock, depending on the two LSbs in the
Duty Cycle registers:
• If the PWM duty cycle match occurs on Q1 or
• If the PWM duty cycle match occurs on Q2 or
When the DTPS<1:0> bits are set to any of the
other dead-time prescaler settings (i.e., F
F
prescaler is set to 1:1, the dead-time counter is
clocked by the Q clock corresponding to the Q
clocks on which the PWM duty cycle match
occurs.
OSC
dead-time prescaler settings: F
F
(PTCKPS) are set to any of the following
prescale ratios: F
Q3, then the dead-time counter is clocked
using every Q1 and Q3.
Q4, then the dead-time counter is clocked
using every Q2 and Q4.
OSC
/8 or F
DECREMENTING THE DEAD-TIME
COUNTER
/8, F
R/W-0
DT2
OSC
OSC
/16
/16) and the PWM time base
 2010 Microchip Technology Inc.
OSC
x = Bit is unknown
/16, F
R/W-0
DT1
OSC
OSC
/64, F
OSC
/4,
OSC
R/W-0
DT0
/4) and
OSC
OSC
/256
bit 0
/4,
/2