The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 06, 2002
Filed:
Dec. 19, 1997
Robert Warren, Thornbury, GB;
SGS-Thomson Microelectronics Limited, Bristol, GB;
Abstract
A single chip integrated circuit device includes a breakpoint range unit having first and second breakpoint registers for holding respectively lower and upper breakpoint addresses between which normal operation of the CPU is to be interrupted for diagnostic purposes. The breakpoint range unit further has comparison logic operative to compare the contents of the address register with each of a lower and upper breakpoint address, and to issue a breakpoint signal when the address held in an address register is equal to the lower breakpoint address or between the lower and upper breakup addresses. On chip control logic is connected to receive the breakpoint signal and arranged to interrupt normal operation of the CPU when the breakpoint signal is received. The comparison logic includes inverse state logic configured to set an inverse state indicator to cause generation of the breakpoint signal outside the address range defined by the upper and lower breakpoint address.