| 摘要 |
<p>PURPOSE:To reduce the possibility that a STORE signal is outputted in error even in the case of a CPU runaway by generating a store signal according to the output of a signal selecting circuit which selects an address signal and a data signal of a microcomputer optionally in combination. CONSTITUTION:A STORE signal control circuit 8 for a nonvolatile RAM (NVRAM) is equipped with the signal selecting circuit 4 which selects an address signal and a data signal of the CPU optionally in combination and generates the STORE signal according to the output of this signal selecting circuit 4. The signal selecting circuit 4 selects the specific address signal and data signal of the CPU to generate the STORE signal when the CPU writes specific data in a specific address of the NVRAM. Consequently, the STORE signal is prevented from easily being generated in the case of a CPU runaway and the generation conditions of the STORE signal are easily changed.</p> |
