Microprocessor controller with automatic clock-rate switching

Details Microprocessor controller with automatic clock-rate switching Microprocessor controller with automatic clock-rate switching

1993-09-16

1995-08-15

Kriess, Kevin A.

Electrical pulse counters, pulse dividers, or shift registers: c

Counting or dividing in incremental steps

Beam type tube

377 48, 377111, 377114, 377 20, 371 14, 371 62, 327114, 327115, G01D 1516, H03K 2102, H03K 519, G06F 1100

Patent

active

054427746

ABSTRACT:
A printer controller employs a microprocessor together with an application-specific-integrated-circuit (ASIC) to manage the operation of the printer. Among its functions, the ASIC manages memory access for the microprocessor. Either fast- or slow-clock microprocessors may be installed in the controller, but the ASIC requires a slow clock. When a fast-clock microprocessor is installed, the ASIC must divide the clock frequency to provide its own (slow) clock. Likewise, the use of a fast-clock microprocessor requires the ASIC to insert memory-cycle WAIT times, whereas a slow-clock microprocessor needs no WAITs. In a preferred embodiment of the invention, provision is made, during initial power-on RESET, to inform the ASIC which clock speed is being used. This information is conveyed by the configuration of the WAIT interconnection between ASIC and microprocessor, thus eliminating the need for a dedicated ASIC pin for this purpose.

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