Datasheet
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
DS70000657H-page 270 2011-2013 Microchip Technology Inc.
REGISTER 18-2: SPIXCON1: SPIX CONTROL REGISTER 1
U-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
— — — DISSCK DISSDO MODE16 SMP CKE
(1)
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
SSEN
(2)
CKP MSTEN SPRE2
(3)
SPRE1
(3)
SPRE0
(3)
PPRE1
(3)
PPRE0
(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 15-13 Unimplemented: Read as ‘0’
bit 12 DISSCK: Disable SCKx Pin bit (SPIx Master modes only)
1 = Internal SPIx clock is disabled, pin functions as I/O
0 = Internal SPIx clock is enabled
bit 11 DISSDO: Disable SDOx Pin bit
1 = SDOx pin is not used by the module; pin functions as I/O
0 = SDOx pin is controlled by the module
bit 10 MODE16: Word/Byte Communication Select bit
1 = Communication is word-wide (16 bits)
0 = Communication is byte-wide (8 bits)
bit 9 SMP: SPIx Data Input Sample Phase bit
Master mode:
1 = Input data is sampled at end of data output time
0 = Input data is sampled at middle of data output time
Slave mode:
SMP must be cleared when SPIx is used in Slave mode.
bit 8 CKE: SPIx Clock Edge Select bit
(1)
1 = Serial output data changes on transition from active clock state to Idle clock state (refer to bit 6)
0 = Serial output data changes on transition from Idle clock state to active clock state (refer to bit 6)
bit 7 SSEN: Slave Select Enable bit (Slave mode)
(2)
1 = SSx pin is used for Slave mode
0 = SSx
pin is not used by the module; pin is controlled by port function
bit 6 CKP: Clock Polarity Select bit
1 = Idle state for clock is a high level; active state is a low level
0 = Idle state for clock is a low level; active state is a high level
bit 5 MSTEN: Master Mode Enable bit
1 = Master mode
0 = Slave mode
Note 1: The CKE bit is not used in Framed SPI modes. Program this bit to ‘0’ for Framed SPI modes (FRMEN = 1).
2: This bit must be cleared when FRMEN = 1.
3: Do not set both primary and secondary prescalers to the value of 1:1.