Importance

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Abstract

For use by an emulation circuit, a non-special-custom microcontroller multiplexes a port among user data and program store addresses. It has a multistate machine cycle with plural clock pulses per state. Various additionally provided emulation pins allow for outputting to an emulation circuit any or all of the following signals: a start-of-cycle pulse indicating non-sleep mode a state-wise recurrent signal signalling progress of said states during non-sleep mode a signal discriminating between idle and reset a multiplexed signalization among any or all of the following: that a next-following machine cycle is the first of a next instruction; that presently an interrupt is being processed; that an external program memory access is forthcoming; that an external data memory access occurs; that an external data memory write access occurs. Since more accurate timing signals are thus provided to the emulation circuit by the microcontroller than can be derived by the emulation circuit otherwise, the emulation circuit can operate at higher speeds.

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First Claim