Communications: electrical – Digital comparator systems
Patent
1974-10-30
1977-01-11
Shaw, Gareth D.
Communications: electrical
Digital comparator systems
G06F 918, G06F 920
Patent
active
040030288
ABSTRACT:
Interrupt circuitry is provided for an MOS integrated circuit microprocessor chip. An input of the microprocessor chip is adapted to having an external interrupt signal applied thereto for interrupting the operation of the microprocessor chip within a digital data processing system. This first input is connected to circuitry which is enabled by a signal from a bit of a condition code register on the microprocessor chip which bit, is set, acts to mask or disenable the interrupt signal, so that the instruction execution operation of the microprocessor chip is not interrupted. A second input of a microprocessor chip is adapted to having a second interrupt signal applied thereto. The second input is connected to other input circuitry which is not enabled by the mask bit of a condition code register. Therefore, the second input acts as a non-maskable interrupt input.
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Bennett Thomas H.
Carlow Earl F.
Peddle Charles
Wiles Michael F.
Hoffman Charles R.
Motorola Inc.
Shaw Gareth D.
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