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Patent Searching and Data


Title:
INPUT/OUTPUT CIRCUIT
Document Type and Number:
Japanese Patent JPH0683984
Kind Code:
A
Abstract:

PURPOSE: To speedily detect the abnormal transmission of data by generating a detection signal when output data held in an output latch are compared with check data and the coincidence is not obtained.

CONSTITUTION: A microcomputer for data reception outputs check data based on the received data to a check terminal 301 without through software and transmits them to a microcomputer for transmission. The transmitter microcomputer compares a check signal 303 inputted through a check terminal 301 with the content of an output latch 31 holding transmission data by means of a detection section 307, generating a detection signal 306 when they are not matched. With the detection signal 306, the microcomputer can detect some abnormality occured in a transmission line which obstructs the normal data transmission and reception. No software confirming the transmission microcomputer and the reception microcomputer is required for the confirmation, and the only delay time is required.


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Inventors:
MATSUZAWA MASAO
Application Number:
JP1992000232131
Publication Date:
March 25, 1994
Filing Date:
August 31, 1992
Export Citation:
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Assignee:
NEC CORP
International Classes:
G06F15/78; (IPC1-7): G06F15/78
Attorney, Agent or Firm:
Sugano Naka