Datasheet
2011-2013 Microchip Technology Inc. DS30001037C-page 141
PIC24F16KL402 FAMILY
REGISTER 17-3: SSPxCON1: MSSPx CONTROL REGISTER 1 (SPI MODE)
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
bit 15 bit 8
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
(1)
SSPEN
(2)
CKP SSPM3
(3)
SSPM2
(3)
SSPM1
(3)
SSPM0
(3)
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 15-8 Unimplemented: Read as ‘0’
bit 7 WCOL: Write Collision Detect bit
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: MSSPx Receive Overflow Indicator bit
(1)
SPI Slave mode:
1 = A new byte is received while the SSPxBUF register is still holding the previous data. In case of over-
flow, the data in SSPxSR is lost. Overflow can only occur in Slave mode. The user must read the
SSPxBUF, even if only transmitting data, to avoid setting overflow (must be cleared in software).
0 = No overflow
bit 5 SSPEN: MSSPx Enable bit
(2)
1 = Enables serial port and configures SCKx, SDOx, SDIx and SSx
as serial port pins
0 = Disables serial port and configures these pins as I/O port pins
bit 4 CKP: Clock Polarity Select bit
1 = Idle state for clock is a high level
0 = Idle state for clock is a low level
bit 3-0 SSPM<3:0>: MSSPx Mode Select bits
(3)
1010 = SPI Master mode, Clock = FOSC/(2 * ([SSPxADD] + 1))
(4)
0101 = SPI Slave mode, Clock = SCKx pin; SSx pin control is disabled, SSx can be used as an I/O pin
0100 = SPI Slave mode, Clock = SCKx pin; SSx
pin control is enabled
0011 = SPI Master mode, Clock = TMR2 output/2
0010 = SPI Master mode, Clock = F
OSC/32
0001 = SPI Master mode, Clock = F
OSC/8
0000 = SPI Master mode, Clock = F
OSC/2
Note 1: In Master mode, the overflow bit is not set since each new reception (and transmission) is initiated by
writing to the SSPxBUF register.
2: When enabled, these pins must be properly configured as input or output.
3: Bit combinations not specifically listed here are either reserved or implemented in I
2
C mode only.
4: SSPxADD value of 0 is not supported when the Baud Rate Generator is used in SPI mode.