PIC18F4431-E/ML Microchip Technology, PIC18F4431-E/ML Datasheet - Page 227

• 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

FIGURE 20-2:
FIGURE 20-3:
FIGURE 20-4:
 2010 Microchip Technology Inc.
Note: This timing diagram shows two consecutive transmissions.
(Interrupt Reg. Flag)
(Interrupt Reg. Flag)
Reg. Empty Flag)
Reg. Empty Flag)
Write to TXREG
Write to TXREG
RC6/TX/CK/SS
RC6/TX/CK/SS
(Transmit Shift
(Transmit Shift
BRG Output
(Shift Clock)
BRG Output
(Shift Clock)
BRG16
TRMT bit
TRMT bit
TXIF bit
TXIF bit
TXIE
(pin)
(pin)
Interrupt
SPBRGH
Baud Rate Generator
1 T
TXIF
TXEN
EUSART TRANSMIT BLOCK DIAGRAM
ASYNCHRONOUS TRANSMISSION
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
CY
Word 1
Transmit Shift Reg
Word 1
Word 1
Transmit Shift Reg.
Word 1
Baud Rate CLK
SPBRG
1 T
CY
Start bit
Start bit
Word 2
MSb
(8)
1 T
PIC18F2331/2431/4331/4431
CY
TX9D
bit 0
TXREG Register
bit 0
TSR Register
TX9

8
Data Bus
bit 1
Word 1
bit 1
Word 1
LSb
0
TRMT
bit 7/8
and Control
Pin Buffer
bit 7/8
Word 2
Transmit Shift Reg.
SPEN
Stop bit
Stop bit
RC6/TX/CK/SS Pin
Start bit
DS39616D-page 227
Word 2
bit 0