Memory storage access control circuit for coupled mask-programme

Details Memory storage access control circuit for coupled mask-programme Memory storage access control circuit for coupled mask-programme

1993-07-02

1996-10-15

Chan, Eddie P.

Boots, shoes, and leggings

39520005, 3642281, 3642304, 364DIG1, G06F 1316, H01J 1300

Patent

active

055663206

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.

REFERENCES:
patent: 4164787 (1979-08-01), Aranguren
patent: 4698753 (1987-10-01), Hubbins et al.
patent: 4803618 (1989-02-01), Ita et al.
patent: 5043937 (1991-08-01), Glaise et al.
German Industrial Standard DIN 41 859.
German Industrial Standard DIN 44 476.
Technical Publication: Microcontroller, Databook, National Semiconductor Corp., Santa Clara, CA, 1988, pp. 4-35 and 4-53.

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