Patent
1996-09-04
1997-07-15
Sheikh, Ayaz R.
39518319, G06F 1100
Patent
active
056492197
ABSTRACT:
In a microcomputer with built-in SOG region system debugging is made possible using a gate array provided outside the microcomputer by supplying signals transferred between a CPU and the gate array to external terminals used for transferring signals between the interior of the microcomputer and a peripheral device outside the microcomputer. In order to supply necessary signals to the gate array connected to the external terminals, a selection circuit which outputs signals between CPU and the SOG region to the external terminals by means of a mode switching signal is provided. By the provision of the selection circuit, it becomes possible to output the signals between the CPU and the SOG region to the external terminals by switching, and to transmit the signals of CPU to the gate array provided outside the microcomputer. Accordingly, it becomes possible to debug the system using the gate array provided outside the microcomputer.
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NEC Corporation
Sheikh Ayaz R.
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