| 摘要 |
PURPOSE:To control many input/output signals by a small number of input/ output ports, and to reduce the cost of a system by constituting the titled controller so that signal lines of (m) times (provided that (m) is an integer) are divided into (m) groups and can be switched selectively with respect to (n) pieces of input ports (or output ports). CONSTITUTION:When an output of an output port 4 of an LSI 1 is set to an H level, an H level voltage is impressed to one of each input terminal of AND gates 7a, 7c, 9a, 9c and 93. As a result, when an input signal I or II is applied on an H level, gates of the AND gates 7a and 7c are opened, and said signal is impressed to an input port 1 or an input port 2 through OR gates 8a, 8b. Also, when an H level signal is outputted to output ports 1-3, gates of the AND gates 9a, 9c and 9e are opened, and output signals I0-III0 are outputted from an inverter 6. When the H level signal is being outputted to an output port 4, an output of the inverter 6 is on an L level. |
