PIC18F67J11T-I Datasheet, PDF (307/466 Pages) Microchip Technology – 64/80-Pin, High-Performance, 1-Mbit Flash Microcontrollers

PIC18F87J11 FAMILY
21.4.2
EUSARTx SYNCHRONOUS SLAVE
RECEPTION
The operation of the Synchronous Master and Slave
modes is identical, except in the case of Sleep, or any
Idle mode and bit, SREN, which is a “don’t care” in
Slave mode.
If receive is enabled by setting the CREN bit prior to
entering Sleep or any Idle mode, then a word may be
received while in this low-power mode. Once the word
is received, the RSR register will transfer the data to the
RCREGx register. If the RCxIE enable bit is set, the
interrupt generated will wake the chip from the
low-power mode. If the global interrupt is enabled, the
program will branch to the interrupt vector.
To set up a Synchronous Slave Reception:
1. Enable the synchronous master serial port by
setting bits, SYNC and SPEN, and clearing bit,
CSRC.
2. If interrupts are desired, set enable bit, RCxIE.
3. If 9-bit reception is desired, set bit, RX9.
4. To enable reception, set enable bit, CREN.
5. Flag bit, RCxIF, will be set when reception is
complete. An interrupt will be generated if
enable bit, RCxIE, was set.
6. Read the RCSTAx register to get the 9th bit (if
enabled) and determine if any error occurred
during reception.
7. Read the 8-bit received data by reading the
RCREGx register.
8. If any error occurred, clear the error by clearing
bit, CREN.
9. If using interrupts, ensure that the GIE and PEIE
bits in the INTCON register (INTCON<7:6>) are
set.
TABLE 21-10: REGISTERS ASSOCIATED WITH SYNCHRONOUS SLAVE RECEPTION
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset
Values
on Page:
INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF
61
PIR1
PMPIF
ADIF
RC1IF TX1IF SSP1IF CCP1IF TMR2IF TMR1IF
64
PIE1
PMPIE
ADIE
RC1IE TX1IE SSP1IE CCP1IE TMR2IE TMR1IE
64
IPR1
PMPIP
ADIP
RC1IP TX1IP SSP1IP CCP1IP TMR2IP TMR1IP
64
PIR3
SSP2IF BCL2IF RC2IF TX2IF TMR4IF CCP5IF CCP4IF CCP3IF
64
PIE3
SSP2IE BCL2IE RC2IE TX2IE TMR4IE CCP5IE CCP4IE CCP3IE
64
IPR3
SSP2IP BCL2IP RC2IP TX2IP TMR4IP CCP5IP CCP4IP CCP3IP
64
RCSTAx
SPEN
RX9
SREN CREN ADDEN FERR OERR RX9D
63
RCREGx EUSARTx Receive Register
63
TXSTAx
CSRC
TX9
TXEN SYNC SENDB BRGH TRMT TX9D
63
BAUDCONx ABDOVF RCIDL RXDTP TXCKP BRG16
—
WUE ABDEN
65
SPBRGHx EUSARTx Baud Rate Generator Register High Byte
65
SPBRGx EUSARTx Baud Rate Generator Register Low Byte
65
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used for synchronous slave reception.
 2007-2012 Microchip Technology Inc.
DS39778E-page 307