The figure below shows the megaAVR 0-series devices, laying out pin
count variants and memory sizes:
- Vertical migration is possible
without code modification, as these devices are fully pin and feature
compatible.
- Horizontal migration to the left
reduces the pin count and, therefore, the available features.
Figure 1. megaAVR® 0-series Overview
Devices with different Flash memory size typically also have different
SRAM and EEPROM.