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参数资料
| 型号： | CP82C59A-12 |
| 厂商： | Intersil |
| 文件页数： | 18/22页 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE 5V 12.5MHZ 28-DIP |
| 标准包装： | 143 |
| 控制器类型： | CMOS 优先中断控制器 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电流 - 电源： | 1mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 28-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 28-PDIP |
| 包装： | 管件 |
5
FN2784.5
March 17, 2006
A more desirable method would be one that would allow the
microprocessor to be executing its main program and only
stop to service peripheral devices when it is told to do so by
the device itself. In effect, the method would provide an
external asynchronous input that would inform the processor
that it should complete whatever instruction that is currently
being executed and fetch a new routine that will service the
requesting device. Once this servicing is complete, however,
the processor would resume exactly where it left off.
This is the Interrupt-driven method. It is easy to see that
system throughput would drastically increase, and thus,
more tasks could be assumed by the microcomputer to
further enhance its cost effectiveness.
The Programmable Interrupt Controller (PlC) functions as an
overall manager in an Interrupt-Driven system. It accepts
requests from the peripheral equipment, determines which of
the incoming requests is of the highest importance (priority),
ascertains whether the incoming request has a higher
priority value than the level currently being serviced, and
issues an interrupt to the CPU based on this determination.
Each peripheral device or structure usually has a special
program or “routine” that is associated with its specific
functional or operational requirements; this is referred to as a
“service routine”. The PlC, after issuing an interrupt to the
CPU, must somehow input information into the CPU that can
“point” the Program Counter to the service routine
associated with the requesting device. This “pointer” is an
address in a vectoring table and will often be referred to, in
this document, as vectoring data.
82C59A Functional Description
The 82C59A is a device specifically designed for use in real
time, interrupt driven microcomputer systems. It manages
eight levels of requests and has built-in features for
expandability to other 82C59As (up to 64 levels). It is
programmed by system software as an I/O peripheral. A
selection of priority modes is available to the programmer so
that the manner in which the requests are processed by the
82C59A can be configured to match system requirements.
The priority modes can be changed or reconfigured
dynamically at any time during main program operation. This
means that the complete interrupt structure can be defined
as required, based on the total system environment.
ROM
I/O (2)
RAM
CPU
INT
I/O (1)
I/O (N)
PIC
FIGURE 3. INTERRUPT METHOD
IR0
IR1
IR2
CASCADE
BUFFER
COMPARATOR
READ/
WRITE
LOGIC
DATA
BUS
BUFFER
IN
SERVICE
REG
(ISR)
PRIORITY
RESOLVER
INTERRUPT MASK REG
(IMR)
INTERRUPT
REQUEST
REG
(IRR)
CONTROL LOGIC
INT
INTA
IR3
IR4
IR5
IR6
IR7
CAS 0
CAS 1
CAS 2
RD
WR
A0
SP
/EN
CS
D7 - D0
INTERNAL BUS
FIGURE 4. 82C59A FUNCTIONAL DIAGRAM
82C59A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CP82C59A-12Z | 功能描述:接口 - 专用 W/ANNEAL PERIPH INT CNTRLR 5V 12 5MHZ RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59 |
| CP82C59A-5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CP82C59AS2065 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CP82C59AS2485 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CP82C59AS2580 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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