PIC24FJ128GA Datasheet, PDF (120/232 Pages) Microchip Technology – General Purpose, 16-Bit Flash Microcontrollers

PIC24FJ128GA FAMILY
REGISTER 14-2: SPIXCON1: SPIx CONTROL REGISTER 1
Upper Byte:
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
—
—
—
DISSCK DISSDO MODE16
bit 15
R/W-0
SMP
R/W-0
CKE
bit 8
Lower Byte:
R/W-0
R/W-0
SSEN
CKP
bit 7
R/W-0
MSTEN
R/W-0
SPRE2
R/W-0
SPRE1
R/W-0
SPRE0
R/W-0
PPRE1
R/W-0
PPRE0
bit 0
bit 15-13 Unimplemented: Read as ‘0’
bit 12 DISSCK: Disable SCKx pin bit (SPI Master modes only)
1 = Internal SPI clock is disabled, pin functions as I/O
0 = Internal SPI clock is enabled
bit 11 DISSDO: Disable SDOx pin bit
1 = SDOx pin is not used by 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 sampled at end of data output time
0 = Input data 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 = Serial output data changes on transition from active clock state to Idle clock state (see bit 6)
0 = Serial output data changes on transition from Idle clock state to active clock state (see bit 6)
Note: The CKE bit is not used in the Framed SPI modes. The user should program this bit to ‘0’ for the
Framed SPI modes (FRMEN = 1).
bit 7
SSEN: Slave Select Enable (Slave mode) bit
1 = SSx pin used for Slave mode
0 = SSx pin not used by module. Pin 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
bit 4-2 SPRE2:SPRE0: Secondary Prescale (Master mode) bits
111 = Secondary prescale 1:1
110 = Secondary prescale 2:1
...
000 = Secondary prescale 8:1
bit 1-0 PPRE1:PPRE0: Primary Prescale (Master mode) bits
11 = Primary prescale 1:1
10 = Primary prescale 4:1
01 = Primary prescale 16:1
00 = Primary prescale 64:1
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
DS39747C-page 118
Preliminary
© 2006 Microchip Technology Inc.