Mode setting control system

Details Mode setting control system Mode setting control system

1982-04-06

1985-03-12

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 300

Patent

active

045049262

ABSTRACT:
A mode setting control system comprising a one-chip microprocessor and a mode setting circuit provided outside the microprocessor. The mode setting circuit comprises mode designating switches, diodes and a flip-flop. Data representing the mode designated by the switches is written into the one-chip microprocessor through I/O pins. After the one-chip microprocessor has been brought out of the reset state, an ADR signal is supplied from the one-chip microprocessor through an ADR pin thereof, whichever operation mode the microprocessor is set to. The ADR signal is supplied to the mode setting circuit, thus electrically disconnecting the same from the one-chip microprocessor. Consequently, data other than the mode data can be written into the I/O pins.

REFERENCES:
patent: 4349870 (1982-09-01), Shaw et al.
MC6801 8-Bit Single-Chip Microcomputer Reference Manual, Motorola, 1980, pp. 1-1-3-27.
Motorola Semiconductors Advance Information ADI-803R2, p. 12, (publication date unknown, but it bears a .COPYRGT. notice of 1980).
Intel MCS-48 Microcomputer User's Manual, pp. 2-15, (Nov. 1976).

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