Patent ID: 7395447

Claim:
An integrated system on a chip with serial asynchronous communication capabilities, comprising: processing circuitry for performing predefined digital processing functions on the chip; an on-chip free running clock circuit for generating a temperature compensated clock, which said on-chip free running clock circuit does not require a synch signal from external to the chip; an asynchronous on-chip communication device for digitally communicating with an off-chip asynchronous communication device for transmitting data thereto and receiving data therefrom, which off-chip asynchronous communication device has an independent time reference, which communication between said on-chip communication device and said off-chip asynchronous communication device is effected without clock recovery, said asynchronous on-chip communication device having a time-base derived from said temperature compensated clock, which time-base is independent of any timing information in the input data received during a receive operation; and wherein said temperature compensated clock provides an on-chip time reference for both said processing circuitry and said asynchronous on-chip communication device.