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FIGURE 3-5
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Figure
3-5.
Timing Diagram for Tuning Wheel Counterclockwise Rotation
3.2.1
MEMORY DEVICES
Memory provides locations to store instructions and data for the microprocessor.
The processor deals with 8-bit binary fields.
The memory associated with the processor is
organized to store eight bits in each location. Data and instructions are stored in memory as
8-bit binary numbers, or as numbers that are integral (even) multiples of eight bits: 16 bits,
24 bits, and so on. This characteristic 8-bit field is referred to as a byte. Each byte is stored
in a memory location that is numbered to distinguish it from aU other locations. The number
which identifies a memory location is called its address.
A group of logically related instruction words, or program, is stored in sequential
memory locations.
The microprocessor reads each instruction in memory in a logically
determined sequence and uses it to initiate processing actions.
The instruction program is
stored in an EPROM integrated circuit on the Synthesizer Interface/Memory Board, MFP-A4.
An addressable area of memory is required to store receiver parameter data for
easy access during transmission, when a remote control equipment request is received or for
updating as locally or remotely selected receiver parameters are changed.
Memory for this
purpose is provided by RAM integrated circuits on the Synthesizer Interface/Memory Board,
MFP-A4.
The RAM also provides an area of memory which the microprocessor uses as a
"scratch pad", to temporarily store data being processed. Another area of RAM is used as a
stack, described in paragraph
3.2.3.1.1.
3-20
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