when the processor takes in information or data from ROM,RAM or input processor
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write
when the processor gives out information or data to RAM or output port
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hardware
Electronic circuits that make up a programmable system
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software
instructions followed by the processor
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bus
a set of wires connection together the memory with elements of programmable system
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data bus
responsible for carrying information
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address bus
carry the information to identify which memory element is required
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tristate buffer
a device to which the output of each memory element is connected
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register
data is stored here before or after processing
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accumulator
these are special registers into which the result of any arithmetic or logical process is placed
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flag register
a special register where each of the eight bits (flags) indicate certain features of the last computation made
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a zero flag
set to 1 if the last operation was 0
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a sign flag
set to 1 to indicate if the content of the accumulator is negative
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a carry flag
indicates if the maximum number has be exceeded
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ALU
Arithmetic logicals unit - preforms arithmetic or Boolean logic operations on the data
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PC
Programme counter - Contains the address of the next instruction
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instruction decoder
interprets each program instruction into a set of electronic conditions that make the data move around appropriately through the processor and operates control lines
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SP
stack pointer - a register containing the address of a region of memory called the stack
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The stack
Used a temporary place to store data and grows in size as the data is added, falling when it is removed.
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Other cards in this set
Card 2
Front
8 bits, its own value
Back
byte
Card 3
Front
A number that relates to an element in RAM or ROM
Back
Card 4
Front
information read by and written by the processor
Back
Card 5
Front
when the processor takes in information or data from ROM,RAM or input processor
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