Microcomputer for accessing a memory outside the chip by using an address generated from the CPU
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United States of America Patent
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Sep 21, 1999
Issued Date -
N/A
app pub date -
Sep 24, 1996
filing date -
Jul 27, 1993
priority date (Note) -
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Abstract
An external bus I/F section has a function in which, when a bus access is requested by an instruction execution section, high-order several bits of a logical address generated by a CPU are outputted from an output terminal to the outside of a chip, as a space identifier for indicating which of an integrated ROM space, an integrated RAM space, and the external space is accessed by a currently executed program. A part of an address generated by the CPU is used so that the space which is accessed by the currently executed program is known from the outside in real time without requiring an external hardware.
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