The maximum clock frequency for the MSP430F5438ACY is 18 MHz, but it can be overclocked to 20 MHz with some limitations. However, it's recommended to follow the recommended operating conditions in the datasheet to ensure reliable operation.
To use an external crystal oscillator, you need to connect the crystal to the XIN and XOUT pins, and configure the UCS (Universal Clock System) module to use the external crystal. This can be done by setting the UCSCTL6 register to select the crystal oscillator as the clock source, and configuring the UCSCTL7 register to set the crystal frequency.
The maximum current that can be sourced or sunk by the GPIO pins of the MSP430F5438ACY is 4 mA per pin, with a total current limit of 30 mA for all GPIO pins combined. However, it's recommended to limit the current to 2 mA per pin to ensure reliable operation.
The MSP430F5438ACY has a built-in temperature sensor that can be accessed through the ADC12 module. To use the temperature sensor, you need to configure the ADC12 module to read the temperature sensor channel, and then use the temperature sensor calibration data provided in the datasheet to convert the ADC reading to a temperature value.
The minimum voltage required to program the MSP430F5438ACY's flash memory is 2.2 V. However, it's recommended to use a voltage of at least 2.5 V to ensure reliable programming.
MSP430F5438ACY datasheet
by Texas Instruments
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