Datasheet
PIC16F87XA
DS39582C-page 82 2001-2013 Microchip Technology Inc.
REGISTER 9-4: SSPCON1: MSSP CONTROL REGISTER 1 (I
2
C MODE) (ADDRESS 14h)
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
WCOL SSPOV SSPEN CKP SSPM3 SSPM2 SSPM1 SSPM0
bit 7 bit 0
bit 7 WCOL: Write Collision Detect bit
In Master Transmit mode:
1 = A write to the SSPBUF register was attempted while the I
2
C conditions were not valid for
a transmission to be started. (Must be cleared in software.)
0 = No collision
In Slave Transmit mode:
1 = The SSPBUF register is written while it is still transmitting the previous word. (Must be
cleared in software.)
0 = No collision
In Receive mode (Master or Slave modes):
This is a “don’t care” bit.
bit 6 SSPOV: Receive Overflow Indicator bit
In Receive mode:
1 = A byte is received while the SSPBUF register is still holding the previous byte. (Must be
cleared in software.)
0 = No overflow
In Transmit mode:
This is a “don’t care” bit in Transmit mode.
bit 5 SSPEN: Synchronous Serial Port Enable bit
1 = Enables the serial port and configures the SDA and SCL pins as the serial port pins
0 = Disables the serial port and configures these pins as I/O port pins
Note: When enabled, the SDA and SCL pins must be properly configured as input or output.
bit 4 CKP: SCK Release Control bit
In Slave mode:
1 = Release clock
0 = Holds clock low (clock stretch). (Used to ensure data setup time.)
In Master mode:
Unused in this mode.
bit 3-0 SSPM3:SSPM0: Synchronous Serial Port Mode Select bits
1111 = I
2
C Slave mode, 10-bit address with Start and Stop bit interrupts enabled
1110 = I
2
C Slave mode, 7-bit address with Start and Stop bit interrupts enabled
1011 = I
2
C Firmware Controlled Master mode (Slave Idle)
1000 = I
2
C Master mode, clock = FOSC/(4 * (SSPADD + 1))
0111 = I
2
C Slave mode, 10-bit address
0110 = I
2
C Slave mode, 7-bit address
Note: Bit combinations not specifically listed here are either reserved or implemented in
SPI mode only.
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