19.14.9 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’
  • I2C pins that are specified as operating in an MVIO voltage domain do not have internal I2C pull-ups implemented. Refer to the device Register Summary for the specific features available in each individual RxyI2C register.
Name: RxyI2C

Bit 76543210 
 SLEW[1:0]PU[1:0]  TH[1:0] 
Access R/WR/WR/WR/WR/WR/W 
Reset 000000 

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

ValueDescription
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
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:
  1. 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

ValueDescription
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’ I2C pins that are specified as operating in an MVIO voltage domain do not have internal I2C pull-ups implemented. Refer to the device Register Summary for the specific features available in each individual RxyI2C register.