chip cannot burst data accesses from external RAM and has a very slow bus access protocol. Because of the simple memory interface that can be programmed by setting a default memory location and writing a few base registers, the chips are quite popular with hobbyists as well as with automotive and industrial developers. External links Freescale's MPC5xx page MPC555, MPC565 Single Board Computers PowerPC microprocessors Freescale Semiconductor microcontrollers