The Tiny Programming Interface (TPI) provides access to the programming facilities. The interface consists of two layers: the access layer and the physical layer.
Figure 1. The Tiny Programming Interface and
Related Internal Interfaces
Programming is done via the physical interface. This is a 3-pin interface, which uses the RESET pin as enable, the TPICLK pin as the clock input, and the TPIDATA pin as data input and output. NVM can be programmed between 1.8-5.5V.