What are alternate functions?

What are alternate functions?

functions, which are called alternate functions. The alternate function is selected by. programming the AFSEL[3:0] bits defined in the Alternate Function Low or High. Register. Alternate functions allow embedded system designers to better tailor the processor chip to the application’s need.

When the same pin of microcontroller can perform different input output functions it is called?

Every microcontroller has different configurations for its pins, and often one pin will have more than one function. This combining of functions on one pin is called pin multiplexing.

What is the significance of EA pin?

EA stands for External Access input. It is used to enable/disable external memory interfacing.

Which port of 8051 has alternate function?

Another function of Port 0 is AD0-AD7. It is used for both address and data. When connecting an 8051/31 to an external memory, port 0 provides both address and data. Port 1 is used as input and output.

What is the alternate function of port 0?

What is difference between fast GPIO and legacy GPIO?

Legacy GPIO registers are known as “slow” GPIOs and the GPIO ports with enhanced features are known as “fast” GPIOs in ARM7 terminology. A different set of registers have to be programmed if you need to use fast GPIOs. For backward compatibility, some ports can still be accessed as slow GPIOs.

What’s the normal function of a microcontroller pin?

Many pins of your microcontroller have different functions. The ‘normal’ function would refer to GPIO, General Purpose Input/Output. In that case, you can use these pins directly by writing to and reading from the relevant registers.

What are the alternate functions of a pin?

When we refer to an alternate function of a pin, we are referring to a function other than I/O (alternate to I/O). We will now look at what each of these alternate functions is. PA2 (pin 1) of the ATtiny2313 microcontroller has two alternate functions – it can be used as a RESET pin or as a debugWIRE pin.

Can a port pin be an alternate pin?

Alternate Pin Functions. The image below shows the ATtiny2313 DIP package with the alternate pin functions labelled: Every port pin of the ATtiny2313 can be used as an I/O (input / output) pin. When we refer to an alternate function of a pin, we are referring to a function other than I/O (alternate to I/O).

What does p1.0 mean on a microcontroller?

So, P1.0 means first pin of port 1, P1.1 means second pin of the port 1 and so on). These pins are bidirectional pins. Reset pin. It is an active-high, input pin. Therefore if the RST pin is high for a minimum of 2 machine cycles, the microcontroller will reset i.e. it will close and terminate all activities.