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PIC18CXX8
DS30475A-page 136
Advanced Information
2000 Microchip Technology Inc.
15.2
Control Registers
The MSSP module has three associated registers.
These include a status register and two control registers.
Register 15-1 shows the MSSP Status Register
(SSPSTAT), Register 15-2 shows the MSSP Control
Register 1 (SSPCON1), and Register 15-3 shows the
MSSP Control Register 2 (SSPCON2).
REGISTER 15-1:
SSPSTAT REGISTER
R/W-0
R-0
SMP
CKE
D/A
PS
R/W
UA
BF
bit 7
bit 0
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
In I2C Master or Slave mode:
1
= Slew rate control disabled for standard speed mode (100 kHz and 1 MHz)
0
= Slew rate control enabled for high speed mode (400 kHz)
bit 6
CKE: SPI Clock Edge Select
CKP = 0
1
= Data transmitted on rising edge of SCK
0
= Data transmitted on falling edge of SCK
CKP = 1
1
= Data transmitted on falling edge of SCK
0
= Data transmitted on rising edge of SCK
bit 5
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
bit 4
P: STOP bit
(I2C mode only. This bit is cleared when the MSSP module is disabled, 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
S: START bit
(I2C mode only. This bit is cleared when the MSSP module is disabled, 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
bit 2
R/W: Read/Write bit information (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 not ACK bit.
In I2C Slave mode:
1
= Read
0
= Write
In I2C Master mode:
1
= Transmit is in progress
0
= Transmit is not in progress
OR-ing this bit with SEN, RSEN, PEN, RCEN, or ACKEN will indicate if the MSSP is in
IDLE mode.
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