PIC18F4431-E/ML Microchip Technology, PIC18F4431-E/ML Datasheet - Page 158

• 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
17.1.3.1
Pulse-width measurement accuracy can only be
ensured when the pulse-width high and low present on
the CAPx input exceeds one T
limitations depend on the mode selected:
• When CAPxM<3:0> = 0110 (rising to falling edge
• When CAPxM<3:0> = 0111 (falling to rising edge
FIGURE 17-6:
DS39616D-page 158
delay), the CAPx input high pulse width (T
must exceed T
delay), the CAPx input low pulse width (T
must exceed T
Note 1: TMR5 can be selected as the time base for input capture. The time base can be optionally reset when the Capture
Note 1: The Period Measurement mode will
2: Detailed CAPxBUF event timing (all modes reflect the same capture and Reset timing) is shown in
2: The Pulse-Width Measurement mode will
CAP1
CAP2
CAP3
Time Base
CAP1BUF
CAP2BUF
CAP3BUF
Time Base Reset
Reset Enable bit is set (CAPxREN = 1).
are six commutation BLDC Hall effect sensor states shown. The other two remaining states (i.e., 000h and 111h) are
invalid in the normal operation. They remain to be decoded by the CPU firmware in BLDC motor application.
produce valid results upon sampling of the
second rising edge of the input capture.
CAPxBUF values latched during the first
active edge after initialization are invalid.
latch the value of the timer upon sampling
of the first input signal edge by the input
capture.
Pulse-Width Measurement Timing
CY
CY
(2)
(2)
(2)
(1)
+ 10 ns.
+ 10 ns.
0FFFh
0000h
INPUT CAPTURE ON STATE CHANGE (HALL EFFECT SENSOR MODE)
(1)
CY
1
0
1
clock cycle. The
1
0
0
CC
CC
L)
H)
1
1
0
0
1
0
0
1
1
17.1.4
When CAPxM<3:0> = 1000, the value is captured on
every signal change on the CAPx input. If all three
capture channels are configured in this mode, the three
input captures can be used as the Hall effect sensor
state transition detector. The value of Timer5 can be
captured, Timer5 reset and the interrupt generated.
Any change on CAP1, CAP2 or CAP3 is detected and
the associated time base count is captured.
For position and velocity measurement in this mode,
the timer can be optionally reset (see
“Timer5 Reset”
0
0
1
INPUT CAPTURE ON STATE
CHANGE
for Reset options).
 2010 Microchip Technology Inc.
Figure
Section 17.1.6
17-4. There