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PIC16F-E/P 数据表(PDF) 74 Page - Microchip Technology |
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PIC16F-E/P 数据表(HTML) 74 Page - Microchip Technology |
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74 / 178 page  PIC16F627A/628A/648A DS40044F-page 72 © 2007 Microchip Technology Inc. REGISTER 12-2: RCSTA – RECEIVE STATUS AND CONTROL REGISTER (ADDRESS: 18h) R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R-0 R-0 R-x SPEN RX9 SREN CREN ADEN FERR OERR RX9D bit 7 bit 0 bit 7 SPEN: Serial Port Enable bit (Configures RB1/RX/DT and RB2/TX/CK pins as serial port pins when bits TRISB<2:1> are set) 1 = Serial port enabled 0 = Serial port disabled bit 6 RX9: 9-bit Receive Enable bit 1 = Selects 9-bit reception 0 = Selects 8-bit reception bit 5 SREN: Single Receive Enable bit Asynchronous mode: Don’t care Synchronous mode - master: 1 = Enables single receive 0 = Disables single receive This bit is cleared after reception is complete. Synchronous mode - slave: Unused in this mode bit 4 CREN: Continuous Receive Enable bit Asynchronous mode: 1 = Enables continuous receive 0 = Disables continuous receive Synchronous mode: 1 = Enables continuous receive until enable bit CREN is cleared (CREN overrides SREN) 0 = Disables continuous receive bit 3 ADEN: Address Detect Enable bit Asynchronous mode 9-bit (RX9 = 1): 1 = Enables address detection, enable interrupt and load of the receive buffer when RSR<8> is set 0 = Disables address detection, all bytes are received, and ninth bit can be used as parity bit Asynchronous mode 8-bit (RX9 = 0): Unused in this mode Synchronous mode Unused in this mode bit 2 FERR: Framing Error bit 1 = Framing error (Can be updated by reading RCREG register and receive next valid byte) 0 = No framing error bit 1 OERR: Overrun Error bit 1 = Overrun error (Can be cleared by clearing bit CREN) 0 = No overrun error bit 0 RX9D: 9th bit of received data (Can be parity bit) Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown |
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