| 摘要 |
<p>PURPOSE:To remove the uncertainty of a timer readout data, by reading out a value of a timer, and after that, reading out its timer value once again, comparing them, detecting their coincidence, and deciding the validity of the timer readout data. CONSTITUTION:Contents of a read time timer 11 are latched to a register 13 through a data bus 18 by a microprogram, and are stored in a memory 16 through an operator 15 and a data bus 20. Subsequently, contents of a real time timer 12 are read out through the same route and are stored in the memory 16. Subsequently, as soon as the contents of the timer 11 are latched to the register once again, a value of the timer 11 stored in the memory 16 are loaded to a register 14 through a data bus 19, and is compared by the operator 15. In cae of coincidence, timer readout data is regarded as effective, and the contents of the register 13 are sent out to a control device 17. In case of dissidence, it is decided that the timer has been updated, the readout is regarded as ineffective, and its fact is informed to the device 17.</p> |
