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OPTION_REG 数据表(PDF) 183 Page - Microchip Technology |
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OPTION_REG 数据表(HTML) 183 Page - Microchip Technology |
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183 / 222 page  2013 Microchip Technology Inc. DS22331A-page 183 MCP19111 REGISTER 27-3: SSPCON1: SSP CONTROL REGISTER 1 R/C/HS-0 R/C/HS-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 WCOL SSPOV SSPEN CKP SSPM<3:0> bit 7 bit 0 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 bit 7 WCOL: Write Collision Detect bit Master mode: 1 = A write to the SSPBUF register was attempted while the I2C conditions were not valid for a transmission to be started 0 = No collision Slave mode: 1 = The SSPBUF register is written while it is still transmitting the previous word (must be cleared in software) 0 = No collision bit 6 SSPOV: Receive Overflow Indicator bit (1) 1 = A byte is received while the SSPBUF register is still holding the previous byte. SSPOV is a “don’t care” in Transmit mode (must be cleared in software). 0 = No overflow bit 5 SSPEN: Synchronous Serial Port Enable bit In both modes, when enabled, these pins must be properly configured as input or output 1 = Enables the serial port and configures the SDA and SCL pins as the source of the serial port pins (2) 0 = Disables serial port and configures these pins as I/O port pins bit 4 CKP: Clock Polarity Select bit In I2C Slave mode: SCL release control 1 = Enable clock 0 = Holds clock low (clock stretch). (Used to ensure data setup time.) In I2C Master mode: Unused in this mode bit 3-0 SSPM<3:0>: Synchronous Serial Port Mode Select bits 0000 = Reserved 0001 = Reserved 0010 = Reserved 0011 = Reserved 0100 = Reserved 0101 = Reserved 0110 = I2C Slave mode, 7-bit address 0111 = I2C Slave mode, 10-bit address 1000 = I2C Master mode, clock = FOSC/(4 x (SSPADD+1)) (3) 1001 = Reserved 1010 = Reserved 1011 = I2C firmware controlled Master mode (Slave idle) 1100 = Reserved 1101 = Reserved 1110 = I2C Slave mode, 7-bit address with Start and Stop bit interrupts enabled 1111 = I2C Slave mode, 10-bit address with Start and Stop bit interrupts enabled Note 1: In Master mode, the overflow bit is not set since each new reception (and transmission) is initiated by writing to the SSPBUF register. 2: When enabled, the SDA and SCL pins must be configured as inputs. 3: SSPADD values of 0, 1 or 2 are not supported for I2C Mode. |
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