The maximum clock frequency that can be used with the internal oscillator is 25 MHz. However, it's recommended to use a crystal oscillator or an external clock source for more accurate and stable clocking.
To configure the pin multiplexing for I2S, you need to set the PINSEL registers to select the I2S function for the desired pins. For example, to use P0.0 as I2S_WS, set PINSEL0 to 0x02. Refer to the user manual for more information on pin multiplexing.
The maximum current that can be sourced or sunk by the GPIO pins is 4 mA. However, it's recommended to limit the current to 2 mA to ensure reliable operation.
To enable the BOD feature, set the BODCR register to the desired voltage threshold and enable the BOD interrupt. The BOD feature will reset the microcontroller if the voltage drops below the set threshold.
The minimum voltage required for the ADC to operate correctly is 2.4 V. However, it's recommended to operate the ADC at a voltage above 2.7 V for optimal performance.
LPC1754FBD80 datasheet
by NXP Semiconductors
