PIC18F97J60_11 Datasheet, PDF (320/492 Pages) Microchip Technology – 64/80/100-Pin, High-Performance, 1-Mbit Flash Microcontrollers with Ethernet

PIC18F97J60 FAMILY
EQUATION 21-1: 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 ([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 21-2: 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
on Page:
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71
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72
DS39762F-page 320
 2011 Microchip Technology Inc.