ST20-C1 STMICROELECTRONICS [STMicroelectronics], ST20-C1 Datasheet - Page 104

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

ecall
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:
Status Register:
Comments:
See also: eret
104/205
Areg
Breg
Creg
if (trap level Areg is installed)
The status register is saved and a new status register with set values is loaded.
Secondary instruction.
Areg must be in the range LowestException to HighestException .
The exception type must be ExceptionProcessType .
Chapter 6.
take trap level Areg
Breg
Creg
Areg
exception call