Download Embedded Controller Hardware Design (Embedded Technology by Ken Arnold PDF

By Ken Arnold

Ken Arnold is an skilled embedded structures dressmaker and president of HiTech apparatus, Inc., an embedded structures layout company situated in San Diego, California. He additionally teaches classes in embedded and software program layout on the collage of California-San Diego. provides the reader an built-in hardware/software method of embedded controller designStresses a "worst case" layout process for the tough environments during which embedded structures are frequently usedIncludes layout examples to make very important innovations come alive

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Many of the SFRs are also bit addressable. Bit A d d r e s s a b l e Memory Figure 2-11 shows the organization of bit addressable space in the internal data memory. The bit address space has a total of 256 possible bit addresses. The first 128 bits, 00 to 7F hex, are used to access individual bits of the internal memory from location 20 to 2F hex. The second 128 bits, from 80 to FF hex, allow selected bits in the special function registers to be accessed at the bit level. Not all SFRs are bit addressable, and not all bit addresses are used in most processors.

The 8051 CPU element is even available as a standard building block for use in designing other chips. There are also 16-bit superset versions of the 8051 architecture! A simple 8051 system is shown in Figure 2-4. Figure 2-4 shows a highly simplified version of the CPU with external program and data memory. (An Figure 2-4: A simple 8051 system address latch is also required, but not usingexternal memories. ) The program is stored in non-volatile ROM memory, such as an EPROM (erasable and programmable read-only memory), and the data is stored in a volatile RAM.

Program (Co:de) Memory i = External Program Memory /PSEN Pulses The processor can fetch instructions from intemal Low or external program memory. There is a control MOVC a 2000 input pin,/EA (extemal access), which forces all 1FFF Internal instructions to be fetched from the extemal Program Memory program memory when the pin is pulled low. ResetVector: 0000 If the/EA pin is pulled high, then the processor will fetch instructions from any available internal program memory. When the processor first powers up and receives a reset signal, it begins by executing the instruction at location 0000 in program memory.

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