System having input output pins shifting between programming mod

Details System having input output pins shifting between programming mod System having input output pins shifting between programming mod

1992-08-31

1995-12-05

Lee, Thomas C.

Boots, shoes, and leggings

395834, 3642329, 3642446, 364716, 364DIG1, 365 52, G06F 1502

Patent

active

054737583

ABSTRACT:
A microcontroller and associated EPROM program memory are fabricated in a single semiconductor chip. The microcontroller device is adapted to be programmed using digital command words or other bit patterns applied as inputs after installation of the device in circuit with a system to be controlled by the device, and to have its programming pins isolated from the system to avoid effects on system operation while the programming is taking place. The in-circuit programming uses considerably less than the total number of input/output (I/O) pins of the device, which in total are fewer than the number of bits in a command word. This is achieved with a serial/parallel programming interface between the pins and the program memory, and by applying the data in serial fashion to the interface where it is latched and loaded in parallel in the memory. Input data to the device may alternatively be entered in parallel to the interface in bytes of width less than the total number of I/O pins of the device.

REFERENCES:
patent: 4680731 (1987-07-01), Izumi et al.
patent: 4785425 (1988-11-01), Lavelle
patent: 4896296 (1990-01-01), Turner et al.
patent: 5222046 (1993-06-01), Kreifels et al.
patent: 5237218 (1993-08-01), Josephson et al.
patent: 5276839 (1994-01-01), Robb et al.
patent: 5336951 (1994-08-01), Josephson et al.

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