The MC9S12XD Family features the performance boosting XGATE co-processor. The XGATE, which is programmable in "C" language, has an instruction set which is optimized for data movement, logic and bit manipulation instructions. It runs at twice the bus frequency of the S12X and off-loads the CPU by providing high speed data transfer (and data processing) between any peripheral module, RAM and I/O ports. This is particularly useful in applications such as automotive gateways where there are multiple busses carrying heavy data traffic which would otherwise exert a heavy interrupt/processing load on the CPU.