Data processing device

A data processing device comprising:

• an instruction decoder which sequentially decodes a plurality of instructions described in a program sequence and outputs a control signal corresponding to each instruction, and
• an instruction execution unit which executes operations designated by the plurality of instructions in accordance with the control signals outputted from said instruction decoder, wherein
• when one of said plurality of instructions is a conditional instruction, said instruction decoder outputs a first control signal by decoding said conditional instruction;
• said instruction execution unit includes a first register for holding said first control signal outputted from said instruction decoder, a second register for holding a first description indicating a condition under which an operation designated by the conditional instruction is executed and a third register for holding a second description indicating a time for starting a judgement of said condition;
• and
• said instruction execution unit starts to judge whether or not said condition is satisfied based on said first description held in said second register in response to an event that the time for starting the judgement of the condition is detected based on said second description held in said third register and reads said first control signal held in said first register in response to the result of the judgement, and starts to execute the operation designated by said conditional instruction in accordance with said first control signal.