PIC18F4431-I/P Microchip Technology Inc., PIC18F4431-I/P Datasheet - Page 176

• Manufacturer Part Number: PIC18F4431-I/P
• Description: Microcontroller; 16 KB Flash; 768 RAM; 256 EEPROM; 36 I/O; 40-Pin-PDIP
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F4431-I/P

• A/d Inputs: 9-Channel, 10-Bit
• Cpu Speed: 10 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 36
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 40-pin PDIP
• Programmable Memory: 16K Bytes
• Ram Size: 768 Bytes
• Speed: 40 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

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