The LPC2917/19 configures the ARM968E-S processor in little-endian byte order. All peripherals run at their own clock frequency to optimize the total system power consumption. The AHB2VPB bridge used in the subsystems contains a write-ahead buffer one transaction deep. This implies that when the ARM968E-S issues a buffered write action to a register located on the VPB side of the bridge, it continues even though the actual write may not yet have taken place. Completion of a second write to the same subsystem will not be executed until the first write is finished.