EBI - External Bus Interface

Quick Facts

What?

The EBI is available in Energy Mode 0 and Energy Mode 1 and is used for accessing external parallel devices. The devices appear as a part of the EFM32s internal memory map and are therefore extremely simple to use.

Why?

Even though the EFM32 is versatile, the need for specific external devices such as extra RAM, FLASH, LCD may arise. The EBI simplifies access to these devices.

How?

Through memory mapping, the devices appear as a part of the internal memory space. When the processor performs read or writes to the address range of the EBI, the EBI handles data transfer to and from the external device. The EBI may be interfaced by the DMA, thus enabling operation in EM1.