Motorola Corporation

Cheri L Harrington

Thomas R Toms

Jules D Campbell, Jr

Thomas Jew

Kelvin E McCollough

Michael E Gladden

Colleen M Collins

Yongliang Wang

Kishna Weaver

Blaine M Prestwich

A method an apparatus for performing a reset operation in an integrated circuit where a memory programming voltage is recovered allowing use of the memory during reset. The voltage recovery unit includes a high voltage conversion portion active for a first recovery period, and a low voltage conversion portion active for a subsequent second recovery period, the low voltage conversion portion is inactive for the first recovery period. The first and second recovery portions are responsive to assertion of a reset signal and an intermediate reset signal generated before the end of the reset period. Recovery of the programming voltage allows uncorrupted retrieval and use of a configuration word during reset. The high voltage conversion portion includes p-channel devices with robust breakdown resistance, and the low voltage conversion portion includes n-channel devices which provides improved speed of operation.

Voltage recovery circuit and method therefor

A compensation circuit (64) for ensuring that a first conductor (60) of a plurality of parallel conductors (60, 61, 62) in a bus (50) remains at a logic high voltage when a second conductor (61) adjacent to the first conductor (60) transitions from a logic high voltage to a logic low voltage. The compensation circuit (64) senses when the voltage on the second conductor (61) is reduced from a logic high voltage to a logic low voltage, and causes the first conductor (60) to be coupled to a power supply voltage terminal to prevent a logic high voltage on the first conductor (60) from being reduced toward a logic low voltage due to a capacitive coupling between the first conductor (60) and the second conductor (61).

Data processing system having a compensation circuit for compensating

A data processing system (10) includes a programmable clock signal for an analog converter (28). A duty cycle of the programmable clock signal is programmed by an external user in a prescaler rate selection register (16). A counter subsequently counts for a first period of time corresponding to a phase in which the programmable clock signal is asserted. The counter then counts for a second period of time corresponding to a phase in which the programmable clock signal is negated. By allowing the user to program and modify the duty cycle of the programmable clock signal, the performance of the analog converter (28) may be optimized without constraining the requirements of an external system clock.

Programmable clock for an analog converter in a data processor and

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Austin, TX, United States of America

Cheri L Harrington