ST20-C1 STMICROELECTRONICS [STMicroelectronics], ST20-C1 Datasheet - Page 188

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

Clear
Creg
Current process
DCU
Descriptor
Deschedule
Diagnostic Controller Unit
DMA
DMA peripheral
Double word
Evaluation stack
Exception
Exception handler
Exception level
188/205
A bit is clear if it has the value 0.
The 32-bit register at the bottom of the evaluation stack .
The process being either being executed by the CPU, interrupted or trapped.
Diagnostic Controller Unit .
Identifier of a process or exception .
A process is descheduled when it is not being executed by the CPU and has not
been interrupted or trapped by an exception handler but it is capable of being
restarted. To deschedule a process is to make it descheduled.
ST20 hardware macro-cell which provides fully non-intrusive breakpoints, watch-
points and code tracing.
Direct memory access. A peripheral or external device performs DMA when it
reads directly from or writes directly to memory.
A peripheral with a DMA engine.
A 64-bit value, occupying two words.
The Areg, Breg and Creg, which together behave as a stack. The evaluation
stack is used for expression evaluation and to hold operands for instructions. The
registers cannot be individually addressed, but values can be pushed onto the
stack or popped off it.
A mechanism for handling events outside the normal program flow. An exception
may be an interrupt or a trap .
The code and data which defines the action when an exception is taken. An
exception handler may be a trap handler or an interrupt handler .
The signed integer specifying which exception will be taken, which is the word
offset from the base of the exception vector table to the descriptor of the process
or exception .