| 摘要 |
PROBLEM TO BE SOLVED: To output more surely a data signal which controls a load even if a microprocessor is abnormal. SOLUTION: When a backup switching signal 15 is inputted to an address selector 5, a data selector 7 and an output signal selector 2 at an abnormarity of a microprocessor 3, the address selector 5 is so controlled that an address count signal 12 from an address counter 13 is supplied to a backup memory 9, the data selector 7 is so controlled that a parallel data signal 6 from the microprocessor 3 is not supplied to the backup memory 9, the output signal selector 2 is so controlled that a serial data signal 16 from a shift register 14 is inputted and a backup data signal (backup data signal stored in the backup memory 9) read out of the backup memory 9 according to the address counter signal 12 from the address counter 13 is outputted as a serial backup data signal from the output signal selector 2 through the shifter register 14 with a clock signal 11 of a baud rate generator 10. |
