| 摘要 |
PROBLEM TO BE SOLVED: To read out the value of a register from the same data bus through which data are supplied. SOLUTION: A data register 20 is connected to a data bus 23 and, when a write signal and an address signal are supplied to the register 20, supplies the signals existing on the bus 23 to a register output. The register 20 supplies its output signal to the data bus 23 when the address signal is supplied and the write signal is not supplied to the register 20 and holds its present value when the write signal is not supplied. |
