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Signal Routing (SR) Ports

What are SR Ports?

The SR port(s) on PIC MCUs allow advanced interconnectivity between peripherals. Output signals from peripherals that normally do not interact can be passed through the SR port for more complex designs and implementations. Additionally, you can use the SR port to implement hardware-based state machines.

Hardware Interconnections

The SR port has a selection of input signals from hardware peripherals. These signals can be synchronized to an internal flip-flop in the port or the signal can be passed through. Some examples of input signals to the SR port include:

SPI signals such as Serial Clock, Serial Select or Serial Data Out
Numerically Controlled Oscillator (NCO) outputs
Comparator (CMP) outputs
Pulse Width Modulation (PWM) outputs
Configurable Logic Cell (CLC) outputs
Input from the next virtual pin
Specific physical I/O pins

The possible input signals vary for each pin in the port. Please consult the data sheet for the full list of signals available and their position(s) within the port.

Software Interactions

In addition to hardware options, the SR port can also be used from software. The MCU can read the output of the SR port like an I/O port and the internal flip-flop can be written to from software (if configured in this way).

Explore SRPORT Code Examples

Documentation

Title
Using the Signal Routing Port Module on 8-bit PIC® Microcontrollers	Download