20.14.9 RxyI2C

I²C Pad Rxy Control Register

Important:

Refer to the “Pin Allocation Table” for details about pin availability per port
Unimplemented bits will read back as ‘0’

Name:

RxyI2C


Bit	7	6	5	4	3	2	1	0
	SLEW[1:0]		PU[1:0]				TH[1:0]
Access	R/W	R/W	R/W	R/W			R/W	R/W
Reset	0	0	0	0			0	0

Bits 7:6 – SLEW[1:0] I²C Specific Slew Rate Limiting Control

Value	Description
11	I²C Fast mode Plus (1 MHz) slew rate enabled. The SLRxy bit is ignored.
10	Reserved
01	I²C Fast mode (400 kHz) slew rate enabled. The SLRxy bit is ignored.
00	Standard GPIO Slew Rate; enabled/disabled via the SLRxy bit

Bits 5:4 – PU[1:0] I²C Pull-Up Selection


Value	Description
Value	FME = `0x`	FME = `10`
`11`	Reserved	0.9 kΩ - 1.3 kΩ Internal pull-up resistance (recommended for I²C loads in the range of 30 pF - 100 pF)⁽¹⁾
`10`	1.9 kΩ - 2.9 kΩ Internal pull-up resistance⁽¹⁾	1.5 kΩ - 2.3 kΩ Internal pull-up resistance (recommended for I²C loads in the range of 20 - 50 pF)⁽¹⁾
`01`	7 kΩ - 10.4 kΩ Internal pull-up resistance⁽¹⁾	3.5 kΩ - 5 kΩ Internal pull-up resistance (recommended for I²C loads in the range of 5 - 20 pF)⁽¹⁾
`00`	Standard GPIO weak pull-up, enabled via the WPUxy bit
Note: The I²C internal pull-up resistance settings described are nominal values and may fluctuate slighly depending on the device operating conditions.

Bits 1:0 – TH[1:0] I²C Input Threshold Selection

Value	Description
11	SMBus 3.0 (1.35V) input threshold
10	SMBus 2.0 (2.1V) input threshold
01	I²C-specific input thresholds
00	Standard GPIO Input pull-up, enabled via the INLVLxy registers

Refer to the “Pin Allocation Table” for details about pin availability per port Unimplemented bits will read back as ‘0’

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