Data processor with development support features

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Details

3642329, 3642328, 3642323, 364267, 36426791, 364DIG1, 371 161, 371 19, G06F 1578, G06F 900

Patent

active

050848143

ABSTRACT:
A data processor with development support features includes an alternate mode of operation in which instructions are received by means of an externally-controlled path. The connections used by the externally-controlled path are not shared by any system resources accessible to the data processor in the normal mode of operation, but are used by other development support features in the normal mode. In a preferred embodiment, an integrated circuit microcomputer includes such a data processor as its CPU. The CPU has access to on-chip peripherals and memory, in addition to off-chip peripherals and memory, in both the normal and alternate modes of operation, by means of a parallel bus which it operates as a bus master. In the alternate mode, the CPU receives instructions by means of a serial bus on which the CPU is a slave device.

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