The maximum clock frequency that can be achieved with the internal oscillator is 12 MHz. However, it's recommended to use an external crystal oscillator for more accurate and stable clock frequencies.
The pin multiplexing can be configured using the PINSELx registers. Each peripheral function has a specific pin assignment, and the PINSELx registers allow you to select which function is assigned to each pin. Refer to the datasheet and the LPC1313 user manual for more information.
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 or less to ensure reliable operation and to prevent overheating.
The LPC1313 has several low-power modes, including Sleep, Deep Sleep, and Power-Down modes. These modes can be entered using the PCON register. Additionally, you can use the ARM Cortex-M3's built-in sleep modes, such as WFI (Wait For Interrupt) and WFE (Wait For Event). Refer to the datasheet and the LPC1313 user manual for more information.
The minimum voltage required for the LPC1313 to operate correctly is 2.4 V. However, it's recommended to operate the device at a voltage between 2.7 V and 3.6 V for optimal performance and reliability.