GMS82524TK datasheet(53/93 Pages) HYNIX

53 / 93 page

GMS82512/16/24

HYUNDAI MicroElectronics

FEB. 2000 Ver 1.00

area for saving registers.

The following method is used to save/restore the general-

purpose registers.

Example: Register save using push and pop instructions

General-purpose register save/restore using push and pop

instructions;

14.2 BRK Interrupt

Software interrupt can be invoked by BRK instruction,

which has the lowest priority order.

Interrupt vector address of BRK is shared with the vector

of TCALL 0 (Refer to Program Memory Section). When

BRK interrupt is generated, B-flag of PSW is set to distin-

guish BRK from TCALL 0.

Each processing step is determined by B-flag as shown in

Figure 14-5.

Figure 14-5 Execution of BRK/TCALL0

INTxx:

PUSH

;SAVE ACC.

;SAVE X REG.

;SAVE Y REG.

interrupt processing

POP

RETI

;RESTORE Y REG.

;RESTORE X REG.

;RESTORE ACC.

;RETURN

main task

interrupt

service task

saving

registers

restoring

registers

acceptance of

interrupt

interrupt return

B-FLAG

BRK

INTERRUPT

ROUTINE

RETI

TCALL0

ROUTINE

RET

BRK or

TCALL0

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