Abstract: An internal integrated circuit clock oscillator is automatically synchronized to an external frequency reference by counting the number of periods of the internal clock oscillator (hereinafter “count”) that occur within a period of a lower frequency external frequency reference then comparing the count to the reference count. When the reference count is greater than the count, the frequency of the internal clock oscillator is increased. When the reference count is less than the count, the frequency of the internal clock oscillator is decreased. When the reference count and the count are substantially the same, the frequency of the internal clock oscillator is not changed.

Abstract: A digital processor is coupled to a processor programmer through a single programming connection (e.g., terminal, pin, etc.) coupled to the single conductor programming bus. The processor programmer comprises an instruction encoder/decoder, a Manchester encoder, a Manchester decoder, a bus receiver and a bus transmitter. The digital processor comprises an instruction encoder/decoder, a Manchester encoder, a Manchester decoder, a bus receiver, a bus transmitter, a central processing unit (CPU), and a program memory. The instruction encoder/decoder is coupled to the CPU and the program memory. The bus receivers and bus transmitters are coupled to the single conductor programming bus which is coupled to a connection, e.g., terminal, pin, ball, etc., on an integrated circuit package containing the digital processor. The instruction encoder/decoder is coupled to a programming console, e.g., a personal computer, workstation, etc.

Abstract: An internal integrated circuit clock oscillator is automatically synchronized to an external frequency reference by counting the number of periods of the internal clock oscillator (hereinafter “count”) that occur within a period of a lower frequency external frequency reference then comparing the count to the reference count. When the reference count is greater than the count, the frequency of the internal clock oscillator is increased. When the reference count is less than the count, the frequency of the internal clock oscillator is decreased. When the reference count and the count are substantially the same, the frequency of the internal clock oscillator is not changed.

Abstract: A digital processor is coupled to a processor programmer through a single programming connection (e.g., terminal, pin, etc.) coupled to the single conductor programming bus. The processor programmer comprises an instruction encoder/decoder, a Manchester encoder, a Manchester decoder, a bus receiver and a bus transmitter. The digital processor comprises an instruction encoder/decoder, a Manchester encoder, a Manchester decoder, a bus receiver, a bus transmitter, a central processing unit (CPU), and a program memory. The instruction encoder/decoder is coupled to the CPU and the program memory. The bus receivers and bus transmitters are coupled to the single conductor programming bus which is coupled to a connection, e.g., terminal, pin, ball, etc., on an integrated circuit package containing the digital processor. The instruction encoder/decoder is coupled to a programming console, e.g., a personal computer, workstation, etc.

Abstract: A digital processor may be coupled to a processor programmer through a single conductor programming bus. The digital processor and the processor programmer, each may have a single programming connection (e.g., terminal, pin, etc.) coupled to the single conductor programming bus. The processor programmer may comprise an instruction encoder/decoder, a Manchester encoder, a Manchester decoder, a bus receiver and a bus transmitter. The bus receiver and bus transmitter may be coupled to the single connection that may be coupled to the single conductor programming bus. The instruction encoder/decoder may be coupled to a programming console, e.g., a personal computer, workstation, etc. The digital processor may comprise an instruction encoder/decoder, a Manchester encoder, a Manchester decoder, a bus receiver, a bus transmitter, a central processing unit (CPU), and a program memory. The bus receiver and bus transmitter may be coupled to the single connection, e.g., terminal, pin, ball, etc.