PIC18F23K20-ESLASHML datasheet(205/456 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS41303G-page 205

PIC18F2XK20/4XK20

SSPCON1: MSSP CONTROL 1 REGISTER (I2C MODE)

R/W-0

WCOL

SSPOV

SSPEN

CKP

SSPM3

SSPM2

SSPM1

SSPM0

bit 7

bit 0

Legend:

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:

= A write to the SSPBUF register was attempted while the I2C conditions were not valid for a trans-

mission to be started (must be cleared by software)

= No collision

In Slave Transmit mode:

= The SSPBUF register is written while it is still transmitting the previous word (must be cleared by

software)

= No collision

In Receive mode (Master or Slave modes):

This is a “don’t care” bit.

bit 6

SSPOV: Receive Overflow Indicator bit

In Receive mode:

= A byte is received while the SSPBUF register is still holding the previous byte (must be cleared

by software)

= No overflow

In Transmit mode:

This is a “don’t care” bit in Transmit mode.

bit 5

SSPEN: Synchronous Serial Port Enable bit

= Enables the serial port and configures the SDA and SCL pins as the serial port pins. When

enabled, the SDA and SCL pins must be configured as inputs.

= Disables serial port and configures these pins as I/O port pins

bit 4

CKP: SCK Release Control bit

In Slave mode:

= Release clock

= 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 * (SSPADD + 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.

PIC18F23K20-E/ML Datasheet(PDF) 205 Page - Microchip Technology

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