PIC18F4550-I/PT Microchip Technology Inc., PIC18F4550-I/PT Datasheet - Page 250

• Manufacturer Part Number: PIC18F4550-I/PT
• Description: 44 PIN, 32 KB FLASH, 2048 RAM, FS-USB 2.0
• Manufacturer: Microchip Technology Inc.

Specifications of PIC18F4550-I/PT

• A/d Inputs: 13-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 12 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 34
• Interface: I2C/SPI/UART/USART/USB
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 44-pin TQFP
• Programmable Memory: 32K Bytes
• Ram Size: 2K Bytes
• Speed: 48 MHz
• Timers: 1-8-bit, 3-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC18F2455/2550/4455/4550
FIGURE 20-3:
FIGURE 20-4:
FIGURE 20-5:
DS39632C-page 248
Note: This timing diagram shows two consecutive transmissions.
(Interrupt Reg. Flag)
Reg. Empty Flag)
Reg. Empty Flag)
Write to TXREG
(Transmit Buffer
Reg. Empty Flag)
(Transmit Shift
Write to TXREG
(Transmit Shift
BRG Output
(Shift Clock)
BRG Output
(Shift Clock)
TRMT bit
TX (pin)
TXIF bit
TRMT bit
BRG16
TX (pin)
TXIF bit
TXIE
Interrupt
1 T
EUSART TRANSMIT BLOCK DIAGRAM
ASYNCHRONOUS TRANSMISSION, TXCKP = 0 (TX NOT INVERTED)
ASYNCHRONOUS TRANSMISSION (BACK TO BACK),
TXCKP = 0 (TX NOT INVERTED)
SPBRGH
Baud Rate Generator
CY
TXIF
TXEN
Word 1
Transmit Shift Reg
Transmit Shift Reg.
Word 1
Word 1
Word 1
Baud Rate CLK
1 T
SPBRG
CY
Start bit
Start bit
Word 2
MSb
(8)
1 T
CY
bit 0
bit 0
Preliminary
TXREG Register
TSR Register
TX9D
bit 1
TX9
8
Data Bus
Word 1
bit 1
Word 1
LSb
0
TRMT
bit 7/8
bit 7/8
and Control
Pin Buffer
TXCKP
Word 2
Transmit Shift Reg.
Stop bit
© 2006 Microchip Technology Inc.
SPEN
Stop bit
Start bit
Word 2
TX pin
bit 0