INV=INPUT_NOT_INVERTED_, SLEW=STANDARD, MODE=INACTIVE_NO_PULL_DO, OD=DISABLE_, HYS=DISABLE_, FUNC=P0_20
I/O configuration register for pin P0[20]
| FUNC | Selects pin function for pin P0[20] 0 (P0_20): General purpose digital input/output pin. 1 (U1_DTR): Data Terminal Ready output for UART1. Can also be configured to be an RS-485/EIA-485 output enable signal for UART1. 2 (SD_CMD): Command line for SD card interface. 3 (I2C1_SCL): I2C1 clock input/output (this pin does not use a specialized I2C pad). |
| MODE | Selects function mode (on-chip pull-up/pull-down resistor control). 0 (INACTIVE_NO_PULL_DO): Inactive (no pull-down/pull-up resistor enabled). 1 (PULL_DOWN_RESISTOR_E): Pull-down resistor enabled. 2 (PULL_UP_RESISTOR_ENA): Pull-up resistor enabled. 3 (REPEATER_MODE_): Repeater mode. |
| HYS | Hysteresis. 0 (DISABLE_): Disable. 1 (ENABLE_): Enable. |
| INV | Invert input 0 (INPUT_NOT_INVERTED_): Input not inverted (HIGH on pin reads as 1, LOW on pin reads as 0). 1 (INPUT_INVERTED_HIGH): Input inverted (HIGH on pin reads as 0, LOW on pin reads as 1). |
| RESERVED | Reserved. |
| SLEW | Driver slew rate 0 (STANDARD): Standard mode, output slew rate control is enabled. More outputs can be switched simultaneously. 1 (FAST): Fast mode, slew rate control is disabled. Refer to the appropriate specific device data sheet for details. |
| OD | Open-drain mode. 0 (DISABLE_): Disable. 1 (OPEN_DRAIN_MODE_ENAB): Open-drain mode enabled. This is not a true open-drain mode. Input cannot be pulled up above VDD. |
| RESERVED | Reserved. |