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Stop-On-Address Capability for a Single-Chip Microprocessor

IP.com Disclosure Number: IPCOM000042982D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04

Publishing Venue

IBM

Related People

Authors:
Hester, PD Johnson, WM [+details]

Abstract

The stop-on-address function, a major debugging aid, is difficult due to processor chip pin limitations. The technique described in this article represents a hardware-based stop-on-address capability implemented on a single-chip microprocessor, completely contained on the chip and requiring no extra module pins. The ability to stop a microprocessor system on a particular instruction is a quite powerful hardware debugging aid. However, such a function is difficult to implement due to pin limitations on the processor chip. The most common method of overcoming this difficulty is to employ logic external to the chip to monitor processor instruction fetch addresses and to stop the system when the desired address is encountered.