PIC16C63A/65B/73B/74B
REGISTER 10-1: SSPSTAT: SYNC SERIAL PORT STATUS REGISTER (ADDRESS 94h)
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
bit 7
SMP: SPI Data Input Sample Phase
SPI Master mode:
1= Input data sampled at end of data output time
0= Input data sampled at middle of data output time (Microwire®)
SPI Slave mode:
SMP must be cleared when SPI is used in Slave mode
I2C mode:
This bit must be maintained clear
bit 6
CKE: SPI Clock Edge Select (see Figure 10-2, Figure 10-3, and Figure 10-4)
SPI mode:
CKP = 0:
1= Data transmitted on rising edge of SCK (Microwire alternate)
0= Data transmitted on falling edge of SCK
CKP = 1:
1= Data transmitted on falling edge of SCK (Microwire default)
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 bit information (I2C mode only). This bit holds the R/W bit information follow-
ing 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 (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
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared x = Bit is unknown
’1’ = Bit is set
DS30605C-page 56
2000 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
