CONTEXT CONTROLLER FOR MANAGING MULTI-TASKING BY PROCESSOR

摘要

PROBLEM TO BE SOLVED: To manage a multi-task in a processor by automatically entering a power saving mode when whole tasks to be executed by means of the processor are in a non-working state. SOLUTION: Text symbols 102 and 104 include declaration of a variable number and the parameter type of a signal to be used for obvious inter-block communication. A mode change-over circuit is connected to a foreground task controller and a background task controller and permits the processor to be in an idle state when the whole contexts are in the non-working state and permits the mode to be the power saving one. The context controller detects a switch state (zero or one) and decides whether a relating task is the foreground task or the background task. The change-over of software is included in a task programmable register.