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Abstract

The invention discloses a memory access control for coupled mask-program over microcontrollers in particular in connection with applications for memory storage programmable control in the low-cost region. The coupling of the microcontroller (MC1) and of the memory access authorization to the external program memory storage and data memory storage (7) is thereby based on a hardware wiring circuit in cooperation with a handshake provided by software. Always only one microcontroller accesses the external program memory storage/data memory storage (7) while the other microcontrollers access their internal program memory storage. The memory storage access is coordinated by the microcontroller (MC1) operating as a master through its output port (Px.y). On the hardware side the memory storage access signal (PSEN) and the address access signal (ALE) are multiplexed for the access-authorized microcontroller. The coupling based on hardware uses thereby the bidirectionally operable input-output ports (P0-P3) and their alternative functions.

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First Claim