2.2.5 ● General-purpose input-output (GPIO) and special function pins

There are multiple external clock inputs:

• LPTMR0 and LPTMR1 can be clocked from unique external sources • I2S can be clocked from its own external source

Figure 2.2 Clock sources

2.2.5 ● General-purpose input-output (GPIO) and special function pins

The MAX78000 microcontroller provides up to 52 GPIO pins. Most general-purpose I/O (GPIO) pins share both a firmware-controlled I/O function and one or more alternate functions, associated with peripheral modules. Pins can be individually enabled for GPIO or peripheral special function use.

Configuring a pin as a special function usually supersedes its use as a firmware-controlled I/O. Although this multiplexing between peripheral and GPIO functions is usually static,