ST20-C1 STMICROELECTRONICS [STMicroelectronics], ST20-C1 Datasheet - Page 191

• Manufacturer Part Number: ST20-C1
• Description: Instruction Set Reference Manual
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Memory
Memory-mapped
Microcode
Micro-kernel
MostNeg
Multi-tasking
Non-local
NotProcess
On-chip emulator
On-chip memory
Operate
Operating system
Operation
Peripheral
Addressed devices which can be read and possibly written. Reading read/write
memory at a particular address gives the value that was last written to that
address. Reading read-only memory always gives the same value.
Addressed devices which are read and written as if they were memory , but do not
necessarily return the last written value.
The on-chip hardware mechanism for implementing instructions.
The ST20 on-chip hardware support for multi-tasking.
The most negative 32-bit integer, #80000000. The address of the base of memory.
The value of the null process pointer NotProcess .
Running several communicating processes on the same processor using time
sharing.
A non-local variable is one that is addressed by means of an offset from the base
address held in Areg. Non-local variables are usually not held on a stack and are
defined globally. cf. local .
The null process pointer, which has the value MostNeg .
Diagnostic controller unit .
Very fast memory included in the ST20 chip. On-chip memory is usually located at
the bottom of the address space .
An instruction component, with function code #F and mnemonic opr , used to
encode secondary instructions . The instruction data value identifies the secondar y
instruction.
Code controlling multi-tasking, interrupts and certain system operations, which
may be called by a program. The ST20 supports many of these facilities in micro-
code without an operating system.
A secondary instruction.
A device connected to and controlled by the CPU.
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