S3C9454B View Datasheet(PDF) - Samsung
Part Name
Description
MFG CO.
'S3C9454B' PDF : 199 Pages View PDF
INTERRUPT STRUCTURE
S3C9454B/F9454B
ENABLE/DISABLE INTERRUPT INSTRUCTIONS (EI, DI)
The system mode register, SYM (DFH), is used to enable and disable interrupt processing.
SYM.3 is the enable and disable bit for global interrupt processing respectively, by modifying SYM.3. An Enable
Interrupt (EI) instruction must be included in the initialization routine that follows a reset operation in order to
enable interrupt processing. Although you can manipulate SYM.3 directly to enable and disable interrupts during
normal operation, we recommend that you use the EI and DI instructions for this purpose.
INTERRUPT PENDING FUNCTION TYPES
When the interrupt service routine has executed, the application program's service routine must clear the
appropriate pending bit before the return from interrupt subroutine (IRET) occurs.
INTERRUPT PRIORITY
Because there is not a interrupt priority register in SAM88RCRI, the order of service is determined by a sequence
of source which is executed in interrupt service routine.
"EI" Instruction
Execution
S
Q
RESET R
Source Interrupts
Source Interrupt
Enable
Interrupt Pending
Register
Interrpt priority
is determind by
software polling
method
Vector Interrupt
Cycle
Global Interrupt
Control (EI, DI instruction)
Figure 5-2. Interrupt Function Diagram
5-2
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