PIC18F45J50-I/SOSQTP 데이터 시트보기 (PDF) - Microchip Technology

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PIC18F45J50-I/SOSQTP

28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

PIC18F46J50 FAMILY

EXAMPLE 20-1: CALCULATING BAUD RATE ERROR

For a device with Fosc of 16 MHz, desired baud rate of 9600, Asynchronous mode, and

8-bit BRG:

Desired Baud Rate = Fosc/(64 ([SPBRGHx:SPBRGx] + 1))

Solving for SPBRGHx:SPBRGx:

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 20-2: REGISTERS ASSOCIATED WITH BAUD RATE GENERATOR

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2 Bit 1

TXSTAx

CSRC

TX9

TXEN SYNC SENDB BRGH TRMT

RCSTAx

SPEN

RX9

SREN CREN ADDEN FERR OERR

BAUDCONx ABDOVF RCIDL RXDTP TXCKP BRG16

—

WUE

SPBRGHx EUSARTx Baud Rate Generator Register High Byte

SPBRGx EUSARTx 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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DS39931D-page 328

 2011 Microchip Technology Inc.

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