PIC18LF4420T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF4420T-I/SO

28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2420/2520/4420/4520

EXAMPLE 18-1: CALCULATING BAUD RATE ERROR

For a device with FOSC of 16 MHz, desired baud rate of 9600, Asynchronous mode, 8-bit BRG:

Desired Baud Rate = FOSC/(64 ([SPBRGH:SPBRG] + 1))

Solving for SPBRGH:SPBRG:

X = ((FOSC/Desired Baud Rate)/64) – 1

= ((16000000/9600)/64) – 1

= [25.042] = 25

Calculated Baud Rate = 16000000/(64 (25 + 1))

= 9615

Error

= (Calculated Baud Rate – Desired Baud Rate)/Desired Baud Rate

= (9615 – 9600)/9600 = 0.16%

TABLE 18-2: REGISTERS ASSOCIATED WITH BAUD RATE GENERATOR

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2 Bit 1

TXSTA

CSRC

TX9

TXEN SYNC SENDB BRGH TRMT

RCSTA

SPEN

RX9

SREN CREN ADDEN FERR OERR

BAUDCON ABDOVF RCIDL

—

SCKP BRG16

—

WUE

SPBRGH EUSART Baud Rate Generator Register, High Byte

SPBRG EUSART Baud Rate Generator Register, Low Byte

Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by the BRG.

Bit 0

TX9D

RX9D

ABDEN

Reset Values

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DS39631A-page 206

Preliminary

 2004 Microchip Technology Inc.

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