Datasheet

PIC16F882/883/884/886/887
DS41291G-page 180  2006-2012 Microchip Technology Inc.
12.4.2.3 EUSART Synchronous Slave
Reception
The operation of the Synchronous Master and Slave
modes is identical (Section 12.4.1.5 “Synchronous
Master Reception”), with the following exceptions:
• Sleep
• CREN bit is always set, therefore the receiver is
never Idle
• SREN bit, which is a “don't care” in Slave mode
A character may be received while in Sleep mode by
setting the CREN bit prior to entering Sleep. Once the
word is received, the RSR register will transfer the data
to the RCREG register. If the RCIE enable bit is set, the
interrupt generated will wake the device from Sleep
and execute the next instruction. If the GIE bit is also
set, the program will branch to the interrupt vector.
12.4.2.4 Synchronous Slave Reception
Setup:
1. Set the SYNC and SPEN bits and clear the
CSRC bit.
2. If interrupts are desired, set the RCIE bit of the
PIE1 register and the GIE and PEIE bits of the
INTCON register.
3. If 9-bit reception is desired, set the RX9 bit.
4. Set the CREN bit to enable reception.
5. The RCIF bit will be set when reception is
complete. An interrupt will be generated if the
RCIE bit was set.
6. If 9-bit mode is enabled, retrieve the Most
Significant bit from the RX9D bit of the RCSTA
register.
7. Retrieve the 8 Least Significant bits from the
receive FIFO by reading the RCREG register.
8. If an overrun error occurs, clear the error by
either clearing the CREN bit of the RCSTA
register or by clearing the SPEN bit which resets
the EUSART.
TABLE 12-10: REGISTERS ASSOCIATED WITH SYNCHRONOUS SLAVE RECEPTION
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Register
on Page
BAUDCTL
ABDOVF RCIDL —SCKPBRG16 — WUE ABDEN 166
INTCON GIE PEIE T0IE INTE RBIE T0IF INTF RBIF 33
PIE1 — ADIE RCIE TXIE SSPIE CCP1IE TMR2IE TMR1IE 34
PIR1
— ADIF RCIF TXIF SSPIF CCP1IF TMR2IF TMR1IF 36
RCREG EUSART Receive Data Register 162
RCSTA SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 165
SPBRG
BRG7 BRG6 BRG5 BRG4 BRG3 BRG2 BRG1 BRG0 167
SPBRGH BRG15 BRG14 BRG13 BRG12 BRG11 BRG10 BRG9 BRG8 167
TRISC TRISC7 TRISC6 TRISC5 TRISC4 TRISC3 TRISC2 TRISC1 TRISC0 55
TXREG
EUSART Transmit Data Register 157
TXSTA CSRC TX9 TXEN SYNC SENDB BRGH TRMT TX9D 164
Legend: x = unknown, – = unimplemented read as ‘0’. Shaded cells are not used for Synchronous Slave
Reception.