| 摘要 |
PROBLEM TO BE SOLVED: To easily detect missing parameter data. SOLUTION: When a signal processing operation is set by parameter data, flip-flop circuits(FF) 82-85 being components of a data latch section 81 of a parameter missing detection section set an input terminal to a fixed signal level. Outputs DF82 and DF84 of the FFs, 82, 84 go to a high level 'H' and outputs DF83 and DF85 of the FFs 83, 85 go to a low level 'L'. The level of the outputs DF83, DF85 is inverted by inverters 88, 89 and NAND between the outputs DF82 and DF84 and inverted DF83 and DF85 is obtained by a NAND gate 87 to set the NAND output to be a missing flag signal ER. When the signal level of the missing flag signal ER is inverted due to a dropped power supply voltage or noise, it is processed that parameter data PD stored in a parameter storage section 79 are missing. |
