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PIC18F1220E/SOSQTP Datasheet(PDF) 155 Page - Microchip Technology |
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PIC18F1220E/SOSQTP Datasheet(HTML) 155 Page - Microchip Technology |
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155 / 308 page  © 2007 Microchip Technology Inc. DS39605F-page 153 PIC18F1220/1320 16.5.2 EUSART 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 RCREG register; if the RCIE enable bit is set, the inter- rupt generated will wake the chip from 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 RCIE. 3. If 9-bit reception is desired, set bit RX9. 4. To enable reception, set enable bit CREN. 5. Flag bit, RCIF, will be set when reception is complete. An interrupt will be generated if enable bit, RCIE, was set. 6. Read the RCSTA 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 RCREG 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 16-10: REGISTERS ASSOCIATED WITH SYNCHRONOUS SLAVE RECEPTION Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Value on POR, BOR Value on all other Resets INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 0000 000x 0000 000u PIR1 — ADIF RCIF TXIF — CCP1IF TMR2IF TMR1IF -000 -000 -000 -000 PIE1 — ADIE RCIE TXIE — CCP1IE TMR2IE TMR1IE -000 -000 -000 -000 IPR1 — ADIP RCIP TXIP — CCP1IP TMR2IP TMR1IP -111 -111 -111 -111 RCSTA SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 0000 000x 0000 000x RCREG EUSART Receive Register 0000 0000 0000 0000 TXSTA CSRC TX9 TXEN SYNC SENDB BRGH TRMT TX9D 0000 0010 0000 0010 BAUDCTL — RCIDL —SCKP BRG16 — WUE ABDEN -1-1 0-00 -1-1 0-00 SPBRGH Baud Rate Generator Register High Byte 0000 0000 0000 0000 SPBRG Baud Rate Generator Register Low Byte 0000 0000 0000 0000 Legend: x = unknown, – = unimplemented, read as ‘0’. Shaded cells are not used for synchronous slave reception. |
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