By Ken Arnold
Ken Arnold is an skilled embedded platforms clothier and president of HiTech apparatus, Inc., an embedded platforms layout enterprise positioned in San Diego, California. He additionally teaches classes in embedded and software program layout on the collage of California-San Diego. supplies the reader an built-in hardware/software method of embedded controller layout Stresses a "worst case" layout strategy for the tough environments within which embedded structures are usually used contains layout examples to make vital thoughts come alive
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Ken Arnold is an skilled embedded structures clothier and president of HiTech apparatus, Inc. , an embedded platforms layout enterprise positioned in San Diego, California. He additionally teaches classes in embedded and software program layout on the college of California-San Diego. provides the reader an built-in hardware/software method of embedded controller layout Stresses a "worst case" layout method for the tough environments during which embedded platforms are usually used contains layout examples to make vital recommendations come alive
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Extra info for Embedded Controller Hardware Design
Data transfer (28) 4. Bit (Boolean) variable manipulation (17) 5. Program branching and control (17) Each of these categories is comprised of instructions that utilize mnemonics as shown below: Arithmetic ADD, ADDC, SUBB, INC, DEC, MUL, DIV, DA Logical ANL, ORL, XRL, CLR, CPL, RL, RLC, RR, RRC, SWAP Data Transfer MOV, MOVX, MOVC, PUSH, POP, XCH, XCHD Bit (Boolean) Variable Manipulation CLR, SETB, CPL, ANL, ORL, MOV, JC, JNC, JB, JNB, JBC Program Branching and Control ACALL, LCALL, RET, RETI, AJMP, LJMP, SJMP, JMP, JZ, JNZ, CJNE, DJNZ, NOP Direct and Register Addressing While the number of mnemonics is clearly smaller in number than the total of 111 instructions, a given mnemonic may be used in several different ways to make up a valid 8051 instruction.
A program memory fetch cycle lasts as long as /PSEN stays low. External program memory must only drive the data bus with the addressed instruction while /PSEN is low. Program Counter This is the pointer to the next instruction to be executed. The 16-bit program counter (PC) controls the sequence in which the instructions stored in program memory are executed. Instruction Register This is the register that contains the instruction that is currently being executed. Internal Program Memory The 8051 family has 16 address lines, and can directly address 216 = 64 kilobytes of program memory.
The buses are: • Data bus • Address bus • Control bus The data bus width is defined as the number of bits that can be transferred on the bus at one time. ” Many chip vendors define the word size based on the width of an internal data bus. For the purposes 25 CHAPTER TWO Microcontroller Concepts of this book, however, a processor with eight data bus pins is an 8-bit CPU. Both instructions and data are transferred on the data bus one “word” at a time. This allows the re-use of the same connections for many different types of information.