SSPxCON1: MSSPx CONTROL REGISTER 1 (I
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2009 Microchip Technology Inc.
DS39682E-page 161
PIC18F45J10 FAMILY
REGISTER 16-4:
SSPxCON1: MSSPx CONTROL REGISTER 1 (I2C MODE)
R/W-0
WCOL
SSPOV
SSPEN(1)
CKP
SSPM3
SSPM2
SSPM1
SSPM0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as 鈥�0鈥�
-n = Value at POR
鈥�1鈥� = Bit is set
鈥�0鈥� = Bit is cleared
x = Bit is unknown
bit 7
WCOL:
Write Collision Detect bit
In Master Transmit mode:
1
= A write to the SSPxBUF register was attempted while the I2C conditions were not valid for a
transmission to be started (must be cleared in software)
0
= No collision
In Slave Transmit mode:
1
= The SSPxBUF register is written while it is still transmitting the previous word (must be cleared in
software)
0
= No collision
In Receive mode (Master or Slave modes):
This is a 鈥渄on鈥檛 care鈥� bit.
bit 6
SSPOV:
Receive Overflow Indicator bit
In Receive mode:
1
= A byte is received while the SSPxBUF register is still holding the previous byte (must be cleared in
software)
0
= No overflow
In Transmit mode:
This is a 鈥渄on鈥檛 care鈥� bit in Transmit mode.
bit 5
SSPEN:
Master Synchronous Serial Port Enable bit(1)
1
= Enables the serial port and configures the SDAx and SCLx pins as the serial port pins
0
= Disables serial port and configures these pins as I/O port pins
bit 4
CKP:
SCK Release Control bit
In Slave mode:
1
= Release clock
0
= Holds clock low (clock stretch), used to ensure data setup time
In Master mode:
Unused in this mode.
bit 3-0
SSPM<3:0>:
Synchronous Serial Port Mode Select bits
1111
= I2C Slave mode, 10-bit address with Start and Stop bit interrupts enabled
1110
= I2C Slave mode, 7-bit address with Start and Stop bit interrupts enabled
1011
= I2C Firmware Controlled Master mode (slave Idle)
1000
= I2C Master mode, clock = FOSC/(4 * (SSPxADD + 1))
0111
= I2C Slave mode, 10-bit address
0110
= I2C Slave mode, 7-bit address
Bit combinations not specifically listed here are either reserved or implemented in SPI mode only.
Note 1:
When enabled, the SDAx and SCLx pins must be configured as inputs.
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