PIC18F4431-E/PT Microchip Technology, PIC18F4431-E/PT Datasheet - Page 176

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

Specifications of PIC18F4431-E/PT

• Core Size: 8-Bit
• Program Memory Size: 16KB (8K x 16)
• Oscillator Type: Internal
• Core Processor: PIC
• 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 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
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 44-TQFP, 44-VQFP
• Controller Family/series: PIC18
• No. Of I/o's: 36
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 768Byte
• Cpu Speed: 40MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC18F2331/2431/4331/4431
FIGURE 16-9:
FIGURE 16-10:
DS39616B-page 174
Note 1: POSCNT register is shown in QEI x4 Update mode (POSCNT increments on every rising and every falling edge of
Note 1: The module design allows a quadrature frequency of up to F
T
QEA pin
QEB pin
QEA input
QEB input
CY
2: When POSCNT = MAXCNT, POSCNT is reset to ‘0’ on the next QEA rising edge. POSCNT is set to MAXCNT when
3: IC2QEI is generated on Q4 rising edge.
4: Position counter is loaded with ‘0’ (which is a rollover event in this case) on POSCNT = MAXCNT.
5: Position counter is loaded with MAXCNT value (1527h) on underflow.
6: IC2QEIF must be cleared in software.
QEA and QEB input signals). Asynchronous external QEA and QEB input are synchronized to T
sampling FF in the noise filter (see Figure 16-14).
POSCNT = 0 (when decrementing), which occurs on the next QEA falling edge.
QEA
QEB
count (+/-)
POSCNT
MAXCNT
IC2QEIF
UP/DOWN
position
counter load
IC3DRIF
(1)
QEI INPUTS WHEN SAMPLED BY THE FILTER (DIVIDE RATIO = 1:1)
QEI MODULE RESET TIMING ON PERIOD MATCH
T
GD
+1 +1 +1 +1 +1 +1 +1 +1 +1 +1 +1 +1
MAXCNT=1527
= 3T
CY
Note 2
T
QEI
Q1
Q4
Forward
(4)
= 16T
(3)
CY (1)
Preliminary
Q1
(5)
-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
Note 6
Note 2
Q1
Q4
(5)
(3)
QEI
Reverse
= F
CY
/16.
 2003 Microchip Technology Inc.
CY
clock by the input