Datasheet

 2010-2012 Microchip Technology Inc. DS41412F-page 275
PIC18(L)F2X/4XK22
FIGURE 16-5: ASYNCHRONOUS RECEPTION
Start
bit
bit 7/8
bit 1bit 0
bit 7/8
bit 0Stop
bit
Start
bit
Start
bit
bit 7/8
Stop
bit
RXx/DTx pin
Reg
Rcv Buffer Reg
Rcv Shift
Read Rcv
Buffer Reg
RCREGx
RCxIF
(Interrupt Flag)
OERR bit
CREN
Word 1
RCREGx
Word 2
RCREGx
Stop
bit
Note: This timing diagram shows three words appearing on the RXx/DTx input. The RCREGx (receive buffer) is read after the third
word, causing the OERR (overrun) bit to be set.
RCIDL
TABLE 16-2: REGISTERS ASSOCIATED WITH ASYNCHRONOUS RECEPTION
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Register
on Page
BAUDCON1 ABDOVF RCIDL DTRXP
CKTXP BRG16 — WUE ABDEN 279
BAUDCON2 ABDOVF RCIDL DTRXP CKTXP BRG16 — WUE ABDEN 279
INTCON GIE/GIEH PEIE/GIEL
TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 116
IPR1 — ADIP RC1IP TX1IP SSP1IP CCP1IP TMR2IP TMR1IP 128
IPR3
SSP2IP BCL2IP RC2IP TX2IP CTMUIP TMR5GIP TMR3GIP TMR1GIP 130
PIE1 — ADIE RC1IE TX1IE SSP1IE CCP1IE TMR2IE TMR1IE 124
PIE3
SSP2IE BCL2IE RC2IE TX2IE CTMUIE TMR5GIE TMR3GIE TMR1GIE 126
PIR1 — ADIF RC1IF TX1IF SSP1IF CCP1IF TMR2IF TMR1IF 119
PIR3
SSP2IF BCL2IF RC2IF TX2IF CTMUIF TMR5GIF TMR3GIF TMR1GIF 121
PMD0 UART2MD UART1MD TMR6MD TMR5MD TMR4MD TMR3MD TMR2MD TMR1MD 55
RCREG1 EUSART1 Receive Register
—
RCSTA1 SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 278
RCREG2 EUSART2 Receive Register
—
RCSTA2 SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 278
SPBRG1 EUSART1 Baud Rate Generator, Low Byte
—
SPBRGH1 EUSART1 Baud Rate Generator, High Byte
—
SPBRG2 EUSART2 Baud Rate Generator, Low Byte
—
SPBRGH2 EUSART2 Baud Rate Generator, High Byte
—
TRISB
(2)
TRISB7 TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0 156
TRISC TRISC7 TRISC6 TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0 156
TRISD
(1)
TRISD7 TRISD6 TRISD5 TRISD4 TRISD3 TRISD2 TRISD1 TRISD0 156
TXSTA1 CSRC TX9 TXEN SYNC SENDB BRGH TRMT TX9D 277
TXSTA2
CSRC TX9 TXEN SYNC SENDB BRGH TRMT TX9D 277
Legend: — = unimplemented locations, read as ‘0’. Shaded bits are not used for asynchronous reception.
Note 1: PIC18(L)F4XK22 devices.
2: PIC18(L)F2XK22 devices.