ST20-C1 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST20-C1' PDF : 205 Pages View PDF
ecall
exception call
Code: 23 F1
Description: Take a trap with exception level indicated by Areg. This instruction can
be used to implement system calls to an operating system.
Definition:
Areg′ ← Breg
Breg′ ← Creg
Creg′ ← Areg
if (trap level Areg is installed)
take trap level Areg
Status Register:
The status register is saved and a new status register with set values is loaded.
Comments:
Secondary instruction.
Areg must be in the range LowestException to HighestException.
The exception type must be ExceptionProcessType.
See also: eret
Chapter 6.
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