PIC18F2331/2431/4331/4431
REGISTER 19-1: SSPSTAT: SYNCHRONOUS SERIAL PORT STATUS REGISTER
R/W-0
SMP
R/W-0
CKE
R-0
D/A
R-0
P
R-0
S
R-0
R-0
UA
R-0
BF
R/W
bit 7
bit 0
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
bit 7
SMP: Sample bit
SPI Master mode:
1= Input data sampled at end of data output time
0= Input data sampled at middle of data output time
SPI Slave mode:
SMP must be cleared when SPI is used in Slave mode.
bit 6
CKE: SPI Clock Edge Select bit (Figure 19-2, Figure 19-3 and Figure 19-4)
SPI mode, CKP = 0:
1= Data transmitted on rising edge of SCK
0= Data transmitted on falling edge of SCK
SPI mode, CKP = 1:
1= Data transmitted on falling edge of SCK
0= Data transmitted on rising edge of SCK
I2C™ mode:
This bit must be maintained clear.
bit 5
bit 4
D/A: Data/Address bit (I2C mode only)
1= Indicates that the last byte received or transmitted was data
0= Indicates that the last byte received or transmitted was address
P: Stop bit (I2C mode only)
This bit is cleared when the SSP module is disabled or when the Start bit is detected last; SSPEN is
cleared.
1= Indicates that a Stop bit has been detected last (this bit is ‘0’ on Reset)
0= Stop bit was not detected last
bit 3
bit 2
S: Start bit (I2C mode only)
This bit is cleared when the SSP module is disabled or when the Stop bit is detected last; SSPEN is
cleared.
1= Indicates that a Start bit has been detected last (this bit is ‘0’ on Reset)
0= Start bit was not detected last
R/W: Read/Write Information bit (I2C mode only)
This bit holds the R/W bit information following the last address match. This bit is only valid from the
address match to the next Start bit, Stop bit or ACK bit.
1= Read
0= Write
bit 1
bit 0
UA: Update Address bit (10-Bit I2C mode only)
1= Indicates that the user needs to update the address in the SSPADD register
0= Address does not need to be updated
BF: Buffer Full Status bit
Receive (SPI and I2C modes):
1= Receive complete, SSPBUF is full
0= Receive not complete, SSPBUF is empty
Transmit (I2C mode only):
1= Transmit in progress, SSPBUF is full
0= Transmit complete, SSPBUF is empty
DS39616D-page 206
2010 Microchip Technology Inc.
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