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| 型號： | IS89C52 |
| 廠商： | Integrated Silicon Solution, Inc. |
| 英文描述： | CMOS Single Chip 8-Bit Microcontroller with 8-Kbytes of Flash(帶8K字節(jié)閃速存儲器的CMOS單片8位微控制器) |
| 中文描述： | CMOS單芯片8位微控制器與8的快閃記憶體（帶8K的字節(jié)閃速存儲器的的CMOS單片8位微控制器） |
| 文件頁數(shù)： | 29/50頁 |
| 文件大?。?/td> | 425K |
| 代理商： | IS89C52 |
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IS89C52
Integrated Silicon Solution, Inc. — 1-800-379-4774
MC013-1C
11/21/98
29
ISSI
INTERRUPT SYSTEM
The IS89C52 provides six interrupt sources: two external
interrupts, two timer interrupts, and a serial port interrupt.
These are shown in Figure 19.
The External Interrupts
INT0
and
INT1
can each be either
level-activated or transition-activated, depending on bits
IT0 and IT1 in Register TCON. The flags that actually
generate these interrupts are the IE0 and IE1 bits in
TCON. When the service routine is vectored, hardware
clears the flag that generated an external interrupt only if
the interrupt was transition-activated. If the interrupt was
level-activated, then the external requesting source (rather
than the on-chip hardware) controls the request flag.
The Timer 0 and Timer 1 Interrupts are generated by TF0
and TF1, which are set by a rollover in their respective
Timer/Counter registers (except for Timer 0 in Mode 3).
When a timer interrupt is generated, the on-chip hardware
clears the flag that generated it when the service routine is
vectored to.
The Serial Port Interrupt is generated by the logical OR of
RI and TI. Neither of these flags is cleared by hardware
when the service routine is vectored to. In fact, the service
routine normally must determine whether RI or TI generated
the interrupt, and the bit must be cleared in software.
In the IS89C52, the Timer 2 Interrupt is generated by the
logical OR of TF2 and EXF2. Neither of these flags is
cleared by hardware when the service routine is vectored
to. In fact, the service routine may have to determine
whether TF2 or EXF2 generated the interrupt, and the bit
must be cleared in software.
All of the bits that generate interrupts can be set or cleared
by software, with the same result as though they had been
set or cleared by hardware. That is, interrupts can be
generated and pending interrupts can be canceled in
software.
Each of these interrupt sources can be individually enabled
or disabled by setting or clearing a bit in Special Function
Register IE (interrupt enable) at address 0A8H. As well as
individual enable bits for each interrupt source, there is a
global enable/disable bit that is cleared to disable all
interrupts or set to turn on interrupts (see SFR IE).
Figure 19. Interrupt System
INT1
INTERNAL
SERIAL
PORT
T2EX
SCON.0
RI
SCON.1
TI
TIMER/COUNTER 1
TCON.7
TF1
EXTERNAL
INT RQST 1
TCON.3
IE1
TIMER/COUNTER 0
TCON.5
TF0
EXTERNAL
INT RQST 0
TCON.1
IE0
INT0
IE.4
IE.3
ET1
IE.2
EX1
IE.1
ET0
IE.0
EX0
IE.7
IP.4
PS
TIMER/
COUNTER 2
T2CON.7
TF2
T2CON.6
EXF2
IE.5
IP.5
PT2
ET2
EA
IP.3
PT1
IP.2
PX1
IP.1
PT0
IP.0
PX0
POLLING
HARDWARE
SOURCE
I.D.
HIGH PRIORITY
INTERRUPT
REQUEST
VECTOR
SOURCE
I.D.
LOW PRIORITY
INTERRUPT
REQUEST
VECTOR
ES
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IS89C52-12PQI | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-12W | CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS93C46-3 | 1,024-BIT SERIAL ELECTRICALLY ERASABLE PROM |
| IS93C46-3G | 1,024-BIT SERIAL ELECTRICALLY ERASABLE PROM |
| IS93C46-3GI | 1,024-BIT SERIAL ELECTRICALLY ERASABLE PROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IS89C52-12PL | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-12PLI | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-12PQ | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-12PQI | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
| IS89C52-12W | 制造商:ISSI 制造商全稱:Integrated Silicon Solution, Inc 功能描述:CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 8-Kbytes of FLASH |
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