Microchip Technology MA330031-2 Data Sheet
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
DS70000657H-page 276
2011-2013 Microchip Technology Inc.
19.2
I
2
C Control Registers
REGISTER 19-1:
I2CxCON: I2Cx CONTROL REGISTER
R/W-0
U-0
R/W-0
R/W-1, HC
R/W-0
R/W-0
R/W-0
R/W-0
I2CEN
—
I2CSIDL
SCLREL
IPMIEN
(
)
A10M
DISSLW
SMEN
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0, HC
R/W-0, HC
R/W-0, HC
R/W-0, HC
R/W-0, HC
GCEN
STREN
ACKDT
ACKEN
RCEN
PEN
RSEN
SEN
bit 7
bit 0
Legend:
HC = Hardware Clearable 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 15
I2CEN:
I2Cx Enable bit
1
= Enables the I2Cx module and configures the SDAx and SCLx pins as serial port pins
0
= Disables the I2Cx module; all I
2
C™ pins are controlled by port functions
bit 14
Unimplemented:
Read as ‘0’
bit 13
I2CSIDL:
I2Cx Stop in Idle Mode bit
1
= Discontinues module operation when device enters an Idle mode
0
= Continues module operation in Idle mode
bit 12
SCLREL:
SCLx Release Control bit (when operating as I
2
C slave)
1
= Releases SCLx clock
0
= Holds SCLx clock low (clock stretch)
If STREN = 1:
Bit is R/W (i.e., software can write ‘0’ to initiate stretch and write ‘1’ to release clock). Hardware is clear
at the beginning of every slave data byte transmission. Hardware is clear at the end of every slave
address byte reception. Hardware is clear at the end of every slave data byte reception.
If STREN = 0:
Bit is R/S (i.e., software can only write ‘1’ to release clock). Hardware is clear at the beginning of every
slave data byte transmission. Hardware is clear at the end of every slave address byte reception.
Bit is R/W (i.e., software can write ‘0’ to initiate stretch and write ‘1’ to release clock). Hardware is clear
at the beginning of every slave data byte transmission. Hardware is clear at the end of every slave
address byte reception. Hardware is clear at the end of every slave data byte reception.
If STREN = 0:
Bit is R/S (i.e., software can only write ‘1’ to release clock). Hardware is clear at the beginning of every
slave data byte transmission. Hardware is clear at the end of every slave address byte reception.
bit 11
IPMIEN:
Intelligent Peripheral Management Interface (IPMI) Enable bit
(
1
= IPMI mode is enabled; all addresses are Acknowledged
0
= IPMI mode disabled
bit 10
A10M:
10-Bit Slave Address bit
1
= I2CxADD is a 10-bit slave address
0
= I2CxADD is a 7-bit slave address
bit 9
DISSLW:
Disable Slew Rate Control bit
1
= Slew rate control is disabled
0
= Slew rate control is enabled
bit 8
SMEN:
SMBus Input Levels bit
1
= Enables I/O pin thresholds compliant with SMBus specification
0
= Disables SMBus input thresholds
bit 7
GCEN:
General Call Enable bit (when operating as I
2
C slave)
1
= Enables interrupt when a general call address is received in I2CxRSR (module is enabled for reception)
0
= General call address disabled
Note 1:
When performing master operations, ensure that the IPMIEN bit is set to ‘0’.