Microchip Technology MA330012 데이터 시트
dsPIC33F
DS70165E-page 210
Preliminary
©
2007 Microchip Technology Inc.
REGISTER 17-2:
SPI
X
CON1: 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
CKP
MSTEN
SPRE<2:0>
PPRE<1:0>
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 (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:
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.
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 (see bit 6)
0
= Serial output data changes on transition from Idle clock state to active clock state (see bit 6)
bit 7
SSEN: Slave Select Enable bit (Slave mode)
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
SPRE<2:0>: Secondary Prescale bits (Master mode)
111
= Secondary prescale 1:1
110
= Secondary prescale 2:1
...
000
000
= Secondary prescale 8:1
bit 1-0
PPRE<1:0>: Primary Prescale bits (Master mode)
11
= Primary prescale 1:1
10
= Primary prescale 4:1
01
= Primary prescale 16:1
00
= Primary prescale 64:1
Note 1:
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
).