Microprocessor integrated circuit working in internal ROM and ex

Details Microprocessor integrated circuit working in internal ROM and ex Microprocessor integrated circuit working in internal ROM and ex

1991-01-03

1998-05-12

Treat, William M.

G06F 1100

Patent

active

057519404

ABSTRACT:
Integrated circuits can have both a microprocessor and an internal read-only memory of programs on one and the same chip. To facilitate the perfecting and finalizing of the programs of the read-only memory without undertaking the manufacture, for the perfecting and finalizing operation, of a special version of the circuit that is far too different from the definitive version, an external memory is used for the perfecting and finalizing operation. A contact pad of the chip is used for the transmission, in series mode, of a program coming from an external memory. A mode selection pad makes it possible to define whether the microprocessor must work in internal ROM mode (the normal mode) or in external ROM mode (the mode for the perfecting and finalizing operation). The circuit elements added to enable this dual operation take up little space, so that the definitive version of a circuit can be identical to the provisional perfecting and finalizing version, except that the definitive version contains a definitive program in the read-only memory. The content of the read-only memory can be defined by a single mask and, consequently, only a single different mask will have to be made for the definitive version.

REFERENCES:
patent: 4514805 (1985-04-01), McDonough et al.
patent: 4609985 (1986-09-01), Dozier
patent: 4839795 (1989-06-01), Iwaksaki
patent: 4982427 (1991-01-01), Nicolai
patent: 5021996 (1991-06-01), Watanabe
patent: 5027118 (1991-06-01), Nicolai
patent: 5036300 (1991-07-01), Nicolai
patent: 5053949 (1991-10-01), Allison et al.
patent: 5062034 (1991-10-01), Bakker
patent: 5070311 (1991-12-01), Nicolai
patent: 5101498 (1992-03-01), Ehlig et al.
DS5000 User's Guide: p. i, 2-3, 7-12, 50-52, 75-78.
Pp. 109-113 of 1989 Dallas Semiconductor data book (DS5000 Data Sheet).

Affiliated with

Also associated with

Rating

Microprocessor integrated circuit working in internal ROM and ex does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Microprocessor integrated circuit working in internal ROM and ex, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microprocessor integrated circuit working in internal ROM and ex will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-992735