through interrupt vectors, as with nearly all other Freescale processors. RS08 interrupts can wake the processor from a WAIT or STOP condition (where execution is temporarily halted), but otherwise do not change program flow. In essence, RS08 runs any thread of programming to completion. The effect is vaguely similar to cooperative multitasking in operating systems. Though handling external events is synchronous, no overhead due to context switching is required, and low-power operation is possible. Interrupt arbitration is exclusively software-controlled. Bibliography Freescale Semiconductor. RS08 Core Reference Manual (RS08RM). Rev. 1.0, 4/2006. Freescale Semiconductor. MC9RS08KA2 Data Sheet (MC9RS08KA2). Rev. 1.0, 4/2006 External links Freescale RS08 Announcement RS08KA Overview at NXP RS08 Core Reference Manual Freescale Semiconductor microcontrollers NXP Semiconductors microcontrollers