Lecture-2 - Department of Computer Science
... method known as two's complement. A little more complicated than sign-and-magnitude but not that much and it has only one zero value. To have –9 in two's complement, you invert all the bits in the representation of 9 and add 1. You can achieve the same result by starting from the right; find the fir ...
... method known as two's complement. A little more complicated than sign-and-magnitude but not that much and it has only one zero value. To have –9 in two's complement, you invert all the bits in the representation of 9 and add 1. You can achieve the same result by starting from the right; find the fir ...
Chapter 2 Parts of a Computer System
... ESP addresses an area of memory called stack. The stack (堆栈) memory is accessed using a LIFO (last-in, first-out 后进先出) method. ESP points to the top of the stack, but will be modified with a push or pop instruction. This register is SP (16 bits) in the real mode and ESP (32 bits) in the protected mo ...
... ESP addresses an area of memory called stack. The stack (堆栈) memory is accessed using a LIFO (last-in, first-out 后进先出) method. ESP points to the top of the stack, but will be modified with a push or pop instruction. This register is SP (16 bits) in the real mode and ESP (32 bits) in the protected mo ...
Instruction level architecture
... • Pentiums have a 32 bit word but fetch things 64 bits at a time – They run faster if you waste a few bytes and align operands on addresses divisible by 8 – What you especially want to avoid is a single reference that spans two double words Copyright © 2005 - Curt Hill ...
... • Pentiums have a 32 bit word but fetch things 64 bits at a time – They run faster if you waste a few bytes and align operands on addresses divisible by 8 – What you especially want to avoid is a single reference that spans two double words Copyright © 2005 - Curt Hill ...
Lecture 4
... • The address of the data an instruction operates on is called the effective address of that instruction. • Each instruction has information which tells the HCS12 the address of the data in memory it operates on. • The addressing mode of the instruction tells the HCS12 how to figure out the effectiv ...
... • The address of the data an instruction operates on is called the effective address of that instruction. • Each instruction has information which tells the HCS12 the address of the data in memory it operates on. • The addressing mode of the instruction tells the HCS12 how to figure out the effectiv ...
Some “facts” about software…
... • How does the data get in there? – Mask programming – data is programmed in at the time of silicon fabrication – PROM – special programming devices allow the user to write data one time – EPROM – data is erased under ultra-violet light or electronically, but must be entirely erased and rewritten (c ...
... • How does the data get in there? – Mask programming – data is programmed in at the time of silicon fabrication – PROM – special programming devices allow the user to write data one time – EPROM – data is erased under ultra-violet light or electronically, but must be entirely erased and rewritten (c ...
Mnemonic operation codes
... instructions eliminates the need to memorize numeric operation codes. It also enables the assembler to provide helpful diagnostics, for example indication of misspelt operation codes. ...
... instructions eliminates the need to memorize numeric operation codes. It also enables the assembler to provide helpful diagnostics, for example indication of misspelt operation codes. ...
Bringing Bits, Bytes, Devices and Computers to Life
... Store the PC at address X and jump to X=1 Load contents of address X into AC. Store the contents of AC at address X. Add the contents of address X to AC. Subtract the contents of Address X from AC. Input a value from the keyboard into AC. Output the value in AC to the display. ...
... Store the PC at address X and jump to X=1 Load contents of address X into AC. Store the contents of AC at address X. Add the contents of address X to AC. Subtract the contents of Address X from AC. Input a value from the keyboard into AC. Output the value in AC to the display. ...
