Microchip Technology MA330018 Data Sheet

© 2007-2012 Microchip Technology Inc.

DS70291G-page  241

Many useful resources related to I

2

C are provided on 

the main product page of the Microchip web site for the 
devices listed in this data sheet. This product page, 
which can be accessed using this 

, contains the 

latest updates and additional information.

19.2.1

KEY RESOURCES

• Section 19. “Inter-Integrated Circuit™ (I

C™)” 

(DS70195)

The I2CxCON and I2CxSTAT are control and status 
registers, respectively. The I2CxCON register is 
readable and writable. The lower six bits of I2CxSTAT 
are read-only. The remaining bits of the I2CxSTAT are 
read/write:
• I2CxRSR is the shift register used for shifting data 

internal to the module and the user application 
has no access to it

• I2CxRCV is the receive buffer and the register to 

which data bytes are written, or from which data 
bytes are read

• I2CxTRN is the transmit register to which bytes 

are written during a transmit operation

• The I2CxADD register holds the slave address
• A status bit, ADD10, indicates 10-bit Address 

mode 

• The I2CxBRG acts as the Baud Rate Generator 

(BRG) reload value

In receive operations, I2CxRSR and I2CxRCV together 
form a double-buffered receiver. When I2CxRSR 
receives a complete byte, it is transferred to I2CxRCV, 
and an interrupt pulse is generated.

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