Samsung S3C9228/P9228, 8-Bit CMOS Microcontroller user manual Interrupt Pending Function Types

INTERRUPT STRUCTURE S3C9228/P9228

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 SAM87RCRI, the order of service is determined by a sequence of source which is executed in interrupt service routine.

"EI" Instruction Execution

RESET

SQ

R

Interrupt Pending

Register

Source Interrupts

Interrpt priority

Vector

Source

Interrupt

Enable

is determind by software polling method

Interrupt Cycle

Global Interrupt

Control (EI, Di instruction)

Figure 5-2. Interrupt Function Diagram

5-2