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MJ15J61L1

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File Size : 116 KB Manufacturer:71 Description:1.2 ARCHITECTURE The COP8SAx family is based on a modified Harvard archi- tecture, which allows data tables to be accessed directly from program memory. This is very important with modern microcontroller-based applications, since program memory is usually ROM or EPROM, while data memory is usually RAM. Consequently data tables usually need to be con- tained in ROM or EPROM, so they are not lost when the mi- crocontroller is powered down. In a modified Harvard archi- tecture, instruction fetch and memory data transfers can be overlapped with a two stage pipeline, which allows the next instruction to be fetched from program memory while the current instruction is being executed using data memory. This is not possible with a Von Neumann single-address bus architecture. The COP8SAx family supports a software stack scheme that allows the user to incorporate many subroutine calls. This capability is important when using High Level Languages. With a hardware stack, the user is limited to a small fixed number of stack levels.