Microprocessor for supplying branch condition indicating signal in response to execution of conditional branch instruction

摘要

A data processor includes first and second microprocessors. The first microprocessor is provided with an external terminal and is additionally fed with an instruction for checking whether a signal fed to that external terminal satisfies a predetermined condition or not thereby to instruct a branching operation if the predetermined condition is satisfied. As a result, the external status of the first microprocessor can be checked. The second microprocessor is provided with an external terminal and is additionally fed with an instruction for checking whether or not the internal status of the second microprocessor satisfies a predetermined condition and supplies the result of the checking operation to the outside of the second microprocessor through the external terminal. As a result the internal status of the second microprocessor can be judged from the outside. The second microprocessor is assigned an arithmetic function. The external terminals attached to the first and second processors are connected to each other. The result of the arithmetic operation conducted in the second microprocessor is fed through the external terminal to the external terminal of the first microprocessor so that the processings including the arithmetic operations can be executed at a high speed.