GMS81032 datasheet(71/101 Pages) HYNIX

tên linh kiện	GMS81032

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5.4 INTERRUPT PROCESSING SEQUENCE

When an interrupt is accepted, the on-going process is stopped and the interrupt service

routine is executed. After the interrupt service routine is completed it is necessary to

restore everything to the state before the interrupt occured.

As soon as an interrupt is accepted, the content of the program counter and PSW are

saved in the stack area.

At the same time, the content of the vector address corresponding to the accepted

interrupt, which is in the interrupt vector table, enters into the program counter and

interrupt service is executed. In order to execute the interrupt service routine, it is

necessary to write the jump addresses in the vector table (FFEOH-FFFFH)

corresponding to each interrupt

Interrupt Processing Step

1) Store upper byte of Program Counter, SP ¡ç SP

2) Store lower byte of Program Counter, SP ¡ç SP - 1

3) Store Program Status Word, SP ¡ç SP - 2

4) After resetting of I-flag, clear accepted Interrupt

Request Flag.(Set B-flag for BRK Instruction)

5) Call Interrupt service routine

Chapter 5. Interrupt

GMS81032 bảng dữ liệu(PDF) 71 Page - Hynix Semiconductor