The driver is designed to support the NXP HTRC110 RFID reader chip and has been designed to work with 8-bit, 16-bit and 32-bit microcontrollers.

The driver has the following hardware requriements:

In order to decode the modulated RFID tag data stream the driver requires the RFID Dout connection to be made to a microcontroller rising edge interrupt pin.  The driver carries out all other communications by driving and reading the microcontroller pins directly.

When a rising edge is detected the driver function that is called needs to be passed the time x1uS since the last rising edge interrupt occured.  Therefore your microcontroller needs to have a timer you can use to allow your code to pass the time value.