Microcomputer capable of accessing to an external memory with le

Details Microcomputer capable of accessing to an external memory with le Microcomputer capable of accessing to an external memory with le

1991-09-30

1996-04-23

Chan, Eddie P.

Boots, shoes, and leggings

364DIG1, 3642431, 365222, G06F 1202

Patent

active

055111769

ABSTRACT:
In a refresh pulse producing circuit of a microcomputer, an access detection section detects access to a non-refresh memory area of an external memory to produce a non-refresh memory signal indicative of the access. A pulse producing section produces a refresh pulse when supplied to a non-refresh memory signal. The refresh pulse producing circuit may comprise a timer for measuring a predetermined time interval from appearance of each refresh pulse to make the pulse producing section produce an additional pulse as one of such refresh pulses after lapse of a predetermined time interval even when the non-refresh memory signal is not produced.

REFERENCES:
patent: 4754425 (1988-01-01), Bhadriraju
patent: 5027327 (1991-06-01), Kobayashi et al.

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