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Pin multiplexing

Other Parts Discussed in Thread: MSP430F5501

Hi All,

I am using MSP430F5501 controller for low power application in this we are using two GPIO pins 1&2 which are also multiplexed with coparator B.Comparator B  have four channels in which two channels are connected  to these GPIO pins 1 and 2  and others are connected to another two I/O pins 3 and 4.We are using comparator for these 3&4 pins but we are not using 1&2 pins for comparator even though comparator is turning ON automatically for these 1&2 pins and consuming energy and affecting these GPIO  pins as well.So can anybody tell me why this is happening without using those pins for comparator?

  • You should take a look at the port pin schematics if the affected pins in the device datasheet. Sometimes this is very enlightening about what signal/register bit is controlling which function.

    Depending on how you set up the port pins and the comparator, you might unintentionally activate some unwanted function on these pins.

    Usually, analog functions are available on pins independently of the digital functions. However, some configuraiton settings will affect the digital part (usually switching it off, so it doesn't disturb).

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