| 摘要 |
<p>PURPOSE:To easily decide whether or not data read out by access to a ROM from a CPU is a specific instruction word or specific data. CONSTITUTION:An instruction part and a data part are both present in the ROM 1 where the program of a CPU is written and at the stage wherein the program is assembled and written in the ROM 1, the specific instruction is searched for previously to write data in the ROM 1. The ROM 1 is structured by adding bits for specific instruction decision outputs to a normal data bus and has dedicated output terminals HD-HDm. The ROM 1 written by this system is used to judge the data part and instruction part. A data storage part corresponding to the addresses of the ROM 1 is stored with decision data for deciding the attributes of data stored in the data storage part and provided with specific instruction decision output terminals HD-HDm for reading the decision data at the same time with data calling from the data storage part.</p> |
