Microchip Technology MA180025 Data Sheet
PIC18F87J90 FAMILY
DS39933D-page 222
2010 Microchip Technology Inc.
REGISTER 18-4:
SSPCON1: MSSP CONTROL REGISTER 1 (I
2
C™ MODE)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
WCOL
SSPOV
SSPEN
(1)
CKP
SSPM3
SSPM2
SSPM1
SSPM0
bit 7
bit 0
Legend:
R = Readable bit
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 7
WCOL: Write Collision Detect bit
In Master Transmit mode:
1
In Master Transmit mode:
1
= A write to the SSPBUF register was attempted while the I
2
C™ conditions were not valid for a
transmission to be started (must be cleared in software)
0
= No collision
In Slave Transmit mode:
1
1
= The SSPBUF 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 “don’t care” bit.
This is a “don’t care” bit.
bit 6
SSPOV: Receive Overflow Indicator bit
In Receive mode:
1
In Receive mode:
1
= A byte is received while the SSPBUF register is still holding the previous byte (must be cleared in
software)
0
= No overflow
In Transmit mode:
This is a “don’t care” bit in Transmit mode.
This is a “don’t care” bit in Transmit mode.
bit 5
SSPEN: Master Synchronous Serial Port Enable bit
(1)
1
= Enables the serial port and configures the SDA and SCL 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
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.
Unused in this mode.
bit 3-0
SSPM<3:0>: Synchronous Serial Port Mode Select bits
1111
= I
2
C Slave mode, 10-bit address with Start and Stop bit interrupts enabled
1110
= I
2
C Slave mode, 7-bit address with Start and Stop bit interrupts enabled
1011
= I
2
C Firmware Controlled Master mode (slave Idle)
1000
= I
2
C Master mode, clock = F
OSC
/(4 * (SSPADD + 1))
0111
= I
2
C Slave mode, 10-bit address
0110
= I
2
C 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 SDA and SCL pins must be configured as inputs.