Control A
Bit7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
INPUTLVL | SDASETUP | SDAHOLD[1:0] | FMPEN | ||||
Access | R/W | R/W | R/W | R/W | R/W | ||
Reset | 0 | 0 | 0 | 0 | 0 |
Input Voltage Transition Level
Value | Name | Description |
---|---|---|
0 | I2C | I2C input voltage transition level |
1 | SMBUS | SMBus 3.0 input voltage transition level |
SDA Setup Time
This bit is used in TWI Client mode to select the clock hold time and to ensure the minimum setup time on the SDA out signal.
Value | Name | Description |
---|---|---|
0 | 4CYC | SDA setup time is four clock cycles |
1 | 8CYC | SDA setup time is eight clock cycles |
SDA Hold Time
This bit field selects the SDA hold time for the TWI. See the Electrical Characteristics section for details.
Value | Name | Description |
---|---|---|
0x0 | OFF | Hold time OFF |
0x1 | 50NS | Short hold time |
0x2 | 300NS | Meets the SMBus 2.0 specifications under typical conditions |
0x3 | 500NS | Meets the SMBus 2.0 across all corners |
FM Plus Enable
Writing a ‘1
’ to this bit selects the 1 MHz bus speed for the
TWI in default configuration or the TWI
host in Dual mode configuration.
Value | Name | Description |
---|---|---|
0 | OFF | Operating in Standard mode or Fast mode |
1 | ON | Operating in Fast mode Plus |