Programming a digital processor with a single connection
View Patent ↗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., on an integrated circuit package containing the digital processor. The single connection may be coupled to the single conductor programming bus. The instruction encoder/decoder may be coupled to the CPU and the program memory.
1. A system for programming a digital processor through a single bit connection, said system comprising:
a digital processor comprising:
a central processing unit;
a program memory coupled to the central processing unit;
a processor instruction encoder/decoder coupled to the central processing unit and the program memory;
a processor serial decoder coupled to the processor instruction encoder/decoder;
a processor serial encoder coupled to the processor instruction encoder/decoder;
a processor single bit bus receiver coupled to the processor serial decoder;
a processor single bit bus transmitter coupled to the processor serial encoder; and
a processor single bit programming connection coupled to the processor single bit bus receiver and transmitter;
a programmer comprising:
a programmer instruction encoder/decoder;
a programmer serial decoder coupled to the programmer instruction encoder/decoder;
a programmer serial encoder coupled to the programmer instruction encoder/decoder;
a programmer single bit bus receiver coupled to the programmer serial decoder;
a programmer single bit bus transmitter coupled to the programmer serial encoder; and
a programmer single bit programming connection coupled to the programmer single bit bus receiver and transmitter; and
a single bit bus coupling together the processor and programmer single bit programming connections;
wherein the processor programmer causes the digital processor to enter into a programming mode by sending a unique data pattern for a certain time.
2. The system of according to claim 1 , wherein the unique data pattern is plurality of alternating logic 1s and 0s.
3. The system of according to claim 1 , wherein the processor programmer writes program instructions into the program memory over the single bit bus.
4. The system of according to claim 1 , wherein the processor programmer writes data into the program memory over the single bit bus.
5. The system of according to claim 1 , wherein the processor programmer reads data from the program memory over the single bit bus.
6. The system of according to claim 1 , wherein the processor and programmer single bit bus transmitters are tri-state bus transmitters having active high and active low outputs.