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GMS81C2112 Datasheet(PDF) 74 Page - Hynix Semiconductor |
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GMS81C2112 Datasheet(HTML) 74 Page - Hynix Semiconductor |
74 / 107 page GMS81C2112/GMS81C2120 68 JUNE. 2001 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; 16.2 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 16-5. Figure 16-5 Execution of BRK/TCALL0 INTxx: PUSH A PUSH X PUSH Y ;SAVE ACC. ;SAVE X REG. ;SAVE Y REG. interrupt processing POP Y POP X POP A 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 =0 =1 |
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