Atmega8515 with external memory board Published January 12, 2009 at 2048 × 1536 in Atmega8515 with external SRAM memory 74HC537 and 128kByte SRAM on top of 8515 eval board Test application of 8515 with 64kByte external memory running at 12MHz clock. Left bottom you see the connection towards the programmer, at the right side you see the UART connection.