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Enabling a single global interrupt vector on the RS08 platform

Posted: 08 Mar 2010     Print Version  Bookmark and Share

Keywords:interrupt vector  RS08 platform  MCRS08KB12 application note 

Based on a need for better interrupt support for the RS08 family, a single interrupt vector is added. Adding a global single interrupt vector is optimised for an entry-level application for lower cost and higher performance. This application note describes how to use it based on the MCRS08KB12.

The RS08 platform is developed for extremely low cost applications. Its hardware size is optimised and the overall system cost is reduced. The interrupt mechanism in the original RS08 is not used to interrupt the normal flow of instructions, but to wake the RS08 from wait and stop modes. In run mode, interrupt events must be polled by the CPU. The original RS08 architecture does not include an interrupt controller with a vector table lookup mechanism as used on the HC08 and HCS08 devices. The CPU must repeatedly check the status of the interrupt flag until the desired condition is indicated, therefore wasting time and increasing the CPU load. The global single interrupt vector is added, the advantage is that the CPU can enter sleep mode to reduce power consumption and wakes when interrupts occur.

View the PDF document for more information.

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