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PIC18F4520E/MLQTP Datasheet(PDF) 208 Page - Microchip Technology

Part # PIC18F4520E/MLQTP
Description  28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
PDF  390 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F4520E/MLQTP Datasheet(HTML) 208 Page - Microchip Technology

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PIC18F2420/2520/4420/4520
DS39631A-page 206
Preliminary
 2004 Microchip Technology Inc.
EXAMPLE 18-1:
CALCULATING BAUD RATE ERROR
TABLE 18-2:
REGISTERS ASSOCIATED WITH BAUD RATE GENERATOR
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%
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
51
RCSTA
SPEN
RX9
SREN
CREN
ADDEN
FERR
OERR
RX9D
51
BAUDCON
ABDOVF
RCIDL
—
SCKP
BRG16
—
WUE
ABDEN
51
SPBRGH
EUSART Baud Rate Generator Register, High Byte
51
SPBRG
EUSART Baud Rate Generator Register, Low Byte
51
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by the BRG.



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