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PIC18F4580-E/ML Datasheet(PDF) 236 Page - Microchip Technology

Part # PIC18F4580-E/ML
Description  28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
PDF  490 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4580-E/ML Datasheet(HTML) 236 Page - Microchip Technology

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PIC18F2480/2580/4480/4580
DS39637D-page 236
© 2009 Microchip Technology Inc.
EXAMPLE 19-1:
CALCULATING BAUD RATE ERROR
TABLE 19-2:
REGISTERS ASSOCIATED WITH BAUD RATE GENERATOR
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset
Values
on Page:
TXSTA
CSRC
TX9
TXEN
SYNC
SENDB
BRGH
TRMT
TX9D
57
RCSTA
SPEN
RX9
SREN
CREN
ADDEN
FERR
OERR
RX9D
57
BAUDCON
ABDOVF
RCIDL
—
SCKP
BRG16
—
WUE
ABDEN
57
SPBRGH
EUSART Baud Rate Generator Register High Byte
57
SPBRG
EUSART Baud Rate Generator Register Low Byte
57
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by the BRG.
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%



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