Datasheet

PIC18(L)F2X/45K50
DS30684A-page 262  2012 Microchip Technology Inc.
REGISTER 16-2: SSPxCON1: SSPx 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’
u = Bit is unchanged x = Bit is unknown -n/n = Value at POR and BOR/Value at all other Resets
‘1’ = Bit is set ‘0’ = Bit is cleared HS = Bit is set by hardware C = User cleared
bit 7 WCOL: Write Collision Detect bit
Master mode:
1 = A write to the SSPxBUF register was attempted while the I
2
C conditions were not valid for a transmission to
be started
0 = No collision
Slave mode:
1 = The SSPxBUF 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)
In SPI mode:
1 = A new byte is received while the SSPxBUF register is still holding the previous data. In case of overflow, the data
in SSPxSR is lost. Overflow can only occur in Slave mode. In Slave mode, the user must read the SSPxBUF, even
if only transmitting data, to avoid setting overflow. In Master mode, the overflow bit is not set since each new recep-
tion (and transmission) is initiated by writing to the SSPxBUF register (must be cleared in software).
0 = No overflow
In I
2
C mode:
1 = A byte is received while the SSPxBUF 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
In SPI mode:
1 = Enables serial port and configures SCK, SDO, SDI and SS as the source of the serial port pins
(2)
0 = Disables serial port and configures these pins as I/O port pins
In I
2
C mode:
1 = Enables the serial port and configures the SDA and SCL pins as the source of the serial port pins
(3)
0 = Disables serial port and configures these pins as I/O port pins
bit 4 CKP: Clock Polarity Select bit
In SPI mode:
1 = Idle state for clock is a high level
0 = Idle state for clock is a low level
In I
2
C Slave mode:
SCL release control
1 = Enable clock
0 = Holds clock low (clock stretch). (Used to ensure data setup time.)
In I
2
C Master mode:
Unused in this mode