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參數(shù)資料
型號(hào)： HMS81C43XX
廠商： Hynix Semiconductor Inc.
英文描述： CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR TELEVISION
中文描述： CMOS單芯片8位單片機(jī)電視
文件頁(yè)數(shù)： 74/100頁(yè)
文件大?。?/td> 1943K
代理商： HMS81C43XX
HMS81C43xx / GMS87C4060
74
November 2001 ver 1.2
A maskable interrupt is not accepted until the I-flag is set
to "1" even if a maskable interrupt of higher priority than
that of the current interrupt being serviced.
When nested interrupt service is necessary, the I-flag is set
to "1" in the interrupt service program. In this case, accept-
able interrupt sources are selectively enabled by the indi-
vidual interrupt enable flags.
Saving/Restoring General-purpose Register
During interrupt acceptance processing, the program
counter and the program status word are automatically
saved on the stack, but not the accumulator and other reg-
isters. These registers are saved by the program if neces-
sary. Also, when nesting multiple interrupt services, it is
necessary to avoid using the same data memory 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;
19.2 BRK Interrupt
Software interrupt can be invoked by BRK instruction,
which is 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 19-6 .
Figure 19-6 Execution of BRK/TCALL0
INTxx:
PUSH
PUSH
LDA
A
X
DPGR
PUSH
A
;SAVE ACC.
;SAVE X REG.
;SAVE DPGR
; Direct page
; accessable reg.
;
:
interrupt processing
:
POP
STA
POP
POP
RETI
A
DPGR
X
A
;RESTORE DPGR
;RESTORE X REG.
;RESTORE ACC.
;RETURN
Basic Interval Timer
Vector Table Address
012
H
0E3
H
0FFE6
H
0FFE7
H
0E
H
2E
H
0E312
H
0E313
H
Entry Address
Correspondence between vector table address for BIT interrupt
and the entry address of the interrupt service program.
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HMS81C4460 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS
HMS81C4X60 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS
HMS81C5216 制造商:未知廠家 制造商全稱:未知廠家 功能描述:REMOTE CONTROLLER
HMS87C1102 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS
HMS87C1102A 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS
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