PIC18F25K20T-ISS Datasheet, PDF (203/456 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC18F2XK20/4XK20
REGISTER 17-3: SSPADD: MSSP ADDRESS AND BAUD RATE REGISTER (I²C MODE)
R/W-0
ADD7
bit 7
R/W-0
ADD6
R/W-0
ADD5
R/W-0
ADD4
R/W-0
ADD3
R/W-0
ADD2
R/W-0
ADD1
R/W-0
ADD0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
Master mode
bit 7-0
ADD<7:0>: Baud Rate Clock Divider bits
SCL pin clock period = ((ADD<7:0> + 1) *4)/FOSC
10-Bit Slave mode: Most significant address byte
bit 7-3
bit 2-1
bit 0
Not used: Unused for most significant address byte. Bit state of this register is a don’t care. Bit pattern
sent by master is fixed by I²C specification and must be equal to ‘11110’. However, those bits are
compared by hardware and are not affected by the value in this register.
ADD<9:8>: Two most significant bits of 10-bit address
Not used: Unused in this mode. Bit state is a “don’t care”.
10-Bit Slave mode: Least significant address byte
bit 7-0
ADD<7:0>: Eight least significant bits of 10-bit address
7-Bit Slave mode
bit 7-1
bit 0
ADD<7:1>: 7-bit address
Not used: Unused in this mode. Bit state is a “don’t care”.
 2010 Microchip Technology Inc.
DS41303G-page 203