| 摘要 |
PURPOSE:To reduce a load on a host device by generating an address on the basis of a received character and a reception state, by reading a prepared control word by the address, and by performing an interruption or transfer to the host device. CONSTITUTION:One received character stored in a receiving buffer register 5 through a signal line group 112 is compared with the contents of a transmission control code register 1 by a comparing circuit 2, and the value of an address register 3 for a transmission control code storage is increased one by one, until coincidence is attained. A control word in a control-word storage register 7, on the other hand, consists of a bit group B0, a bit B1, and a bit group B2, and is read out by an address generated by a control word storage address generating circuit 4, i.e., the outputs of the registers 6 and 3. The B0 of the control word is stored in the register 6, and the B1 and B2 are supplied to an interruption control circuit 8. If, however, the B1 is a 1, an interruption request is sent to a host device and the B2 is transferred as an interruption factor through output line groups 110 and 111, thereby inhibiting an interruption when the B1 is a 0. |
