參數(shù)資料
型號(hào): GMS81524BT
廠商: Hynix Semiconductor Inc.
英文描述: [General Purpose(1) : ADC/ LED/ SCI/ PWM]
中文描述: [通用(1):藝術(shù)發(fā)展局/發(fā)光/工商/脈寬調(diào)制]
文件頁數(shù): 66/110頁
文件大?。?/td> 1980K
代理商: GMS81524BT
GMS81508B/16B/24B, GMS82512/16/24
MAY. 2001 Ver 2.0
63
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
PUSH
PUSH
A
X
Y
;SAVE ACC.
;SAVE X REG.
;SAVE Y REG.
interrupt processing
POP
POP
POP
RETI
Y
X
A
;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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