Microcomputer having a built-in PROM for storing an optional pro

Details Microcomputer having a built-in PROM for storing an optional pro Microcomputer having a built-in PROM for storing an optional pro

1986-10-06

1991-11-26

Chan, Eddie P.

Boots, shoes, and leggings

3642328, 3642329, 3642216, 3642217, 364221, 364DIG1, G06F 1100

Patent

active

050687832

ABSTRACT:
A microcomputer selectively operable in a first mode or a second mode comprises a first read-only memory for storing a first program to be executed in the first mode, a second, programmable read-only memory for storing a second program to be executed in the second mode, an input circuit for inputting the second program to be written in the second read-only memory, an execution circuit for executing the first program or the second program, and a mode control circuit responsive to a mode selection signal for enabling execution of the first program when the mode selection signal designates the first mode and for enabling writing and execution of the second program when the mode selection signal designates the second mode.

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"Adding EEPROM to ROM Expands IC Versatility", EDN, Oct. 13th, 1983, Morales et al., pp. 177-188.

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