Title:
【発明の名称】シリアルポ-ト方式
Document Type and Number:
Japanese Patent JPS6017139
Kind Code:
B2
Abstract:
PURPOSE:To make input and output surely without error between the external circuits and the circuit using a serial port system of dynamic type which makes input and output of serial data between said circuit and the external circuit and provides shift registers of a plurality of bits and transfers data with a shift clock. CONSTITUTION:A serial input latch circuit ILA which fetches data at the leading edge of a serial data clock SC given from external circuits and a serial output latch circuit OLA which fetches and transmits the trailing data are connected among n-bit shift registers SR1-SRn, an input terminal Si and an output terminal. SC, and the data of an FF1 of bit SRn in which the trailing edge of the clock SC is given to the output latch circuit OLA via an inverter INV at time t1 is fetched to the circuit OLA, and the data of the external circuit OLA given to an input latch circuit ILA at the leading of the clock SC at the next tme t2 is received via the input terminal Si and latched to the circuit ILA. A shift clock generating section 500 generates shift clocks S1, S2 with the clock SC.
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Inventors:
KIMURA MASAHARU
Application Number:
JP16927280A
Publication Date:
May 01, 1985
Filing Date:
December 01, 1980
Export Citation:
Assignee:
FUJITSU LTD
International Classes:
H03M9/00; G06F5/08; G06F13/00; G06F15/78; H04L29/00; (IPC1-7): G06F13/00; H03M9/00; H04L13/00
Attorney, Agent or Firm:
Koshiro Matsuoka