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參數(shù)資料
| 型號： | IS80LV32-40PQ |
| 廠商： | INTEGRATED SILICON SOLUTION INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, 40 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 31/48頁 |
| 文件大?。?/td> | 408K |
| 代理商： | IS80LV32-40PQ |
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IS80LV52
IS80LV32
Integrated Silicon Solution, Inc. — 1-800-379-4774
ADVANCE INFORMATION
MC019-0A
10/01/98
31
ISSI
Thus, the processor acknowledges an interrupt request
by executing a hardware-generated LCALL to the
appropriate servicing routine. In some cases it also clears
the flag that generated the interrupt, and in other cases it
does not. It never clears the Serial Port or Timer 2 flags.
This must be done in the user's software. The processor
clears an external interrupt flag (IE0 or IE1) only if it was
transition-activated. The hardware-generated LCALL
pushes the contents of the Program Counter onto the
stack (but it does not save the PSW) and reloads the PC
with an address that depends on the source of the
interrupt being serviced, as follows:
Interrupt
Source
INT0
Interrupt
Request Bits
IE0
Cleared by
Hardware
No (level)
Yes (trans.)
Yes
No (level)
Yes (trans.)
Yes
No
No
Vector
Address
0003H
Timer 0
INT1
TF0
IE1
000BH
0013H
Timer 1
Serial Port
Timer 2
System
Reset
TF1
RI, TI
TF2, EXF2
RST
001BH
0023H
002BH
0000H
Execution proceeds from that location until the RETI
instruction is encountered. The RETI instruction informs
the processor that this interrupt routine is no longer in
progress, then pops the top two bytes from the stack and
reloads the Program Counter. Execution of the interrupted
program continues from where it left off.
Note that a simple RET instruction would also have
returned execution to the interrupted program, but it
would have left the interrupt control system thinking an
interrupt was still in progress.
SFR Register and
Bit Position
TCON.1
TCON.3
TCON.7
TCON.5
SCON.1
SCON.0Timer 2
Interrupt
External 0
External 1
Timer 1
Timer 0
Serial Port
Serial Port
TF2
Timer 2
Flag
IE0
IE1
TF1
TF0
TI
RI
T2CON.7
EXF2
T2CON.6
When an interrupt is accepted the following action occurs:
1. The current instruction completes operation.
2. The PC is saved on the stack.
3. The current interrupt status is saved internally.
4. Interrupts are blocked at the level of the interrupts.
5. The PC is loaded with the vector address of the ISR
(interrupts service routine).
6. The ISR executes.
The ISR executes and takes action in response to the
interrupt. The ISR finishes with RETI (return from interrupt)
instruction. This retrieves the old value of the PC from the
stack and restores the old interrupt status. Execution of
the main program continues where it left off.
External Interrupts
The external sources can be programmed to be level-
activated or transition-activated by setting or clearing bit
IT1 or IT0 in Register TCON. If ITx= 0, external interrupt
x is triggered by a detected low at the INTx pin. If ITx = 1,
external interrupt x is edge-triggered. In this mode if
successive samples of the INTx pin show a high in one
cycle and a low in the next cycle, interrupt request flag IEx
in TCON is set. Flag bit IEx then requests the interrupt.
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| IS80LV32-40W | CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80LV32-40WI | CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80LV52-24PL | CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| IS80LV32-40PQI | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80LV32-40W | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80LV32-40WI | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80LV51 | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
| IS80LV51-24PL | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP LOW VOLTAGE 8-BIT MICROCONTROLLER |
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