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| 型號： | ST20GP1 |
| 英文描述： | MAX 7000 CPLD 256 MC 208-PQFP |
| 中文描述： | GPS處理器 |
| 文件頁數(shù)： | 29/116頁 |
| 文件大?。?/td> | 1107K |
| 代理商： | ST20GP1 |
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ST20-GP1
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5.1
Interrupt vector table
The interrupt controller contains a table of pointers to interrupt handlers. Each interrupt handler is
represented by its workspace pointer (
Wptr
). The table contains a workspace pointer for each level
of interrupt.
The
Wptr
gives access to the code, data and interrupt save space of the interrupt handler. The
position of the
Wptr
in the interrupt table implies the priority of the interrupt.
Run-time library support is provided for setting and programming the vector table.
5.2
Interrupt handlers
At any interruptible point in its execution the CPU can receive an interrupt request from the
interrupt controller. The CPU immediately acknowledges the request.
In response to receiving an interrupt the CPU performs a procedure call to the process in the vector
table. The state of the interrupted process is stored in the workspace of the interrupt handler as
shown in Figure 5.2. Each interrupt level has its own workspace.
Figure 5.2 State of interrupted process
The interrupt routine is initialized with space below
Wptr
. The
Iptr
and
Status
word for the routine
are stored there permanently. This should be programmed before the
Wptr
is written into the vector
table. The behavior of the interrupt differs depending on the priority of the CPU when the interrupt
occurs.
When an interrupt occurs when the CPU was running at high priority, the CPU saves the current
process state (
Areg
,
Breg
,
Creg
,
Wptr
,
Iptr
and
Status
) into the workspace of the interrupt
handler. The value
HandlerWptr
, which is stored in the interrupt controller, points to the top of this
Handler
Status
Before interrupt
Wptr
Handler
Iptr
Areg
Breg
Creg
Interrupting high priority
process
Wptr
Wptr
Iptr
Status
Wptr
Null Status
Interrupting low priority
process or CPU idle
Handler
Status
Handler
Iptr
Handler
Status
Handler
Iptr
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST20GP6 | MAX 7000 CPLD 256 MC 208-RQFP |
| ST25C02AB1 | IC FLEX 6000 FPGA 16K 144-TQFP |
| ST25C02AB6 | Stratix FPGA 25K FBGA-672 |
| ST25C02AM1 | IC ACEX 1K FPGA 100K 208-PQFP |
| ST25C02AM6 | Cyclone II FPGA 20K FBGA-256 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST20-GP1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
| ST20GP1X33S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
| ST20GP6 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:GPS PROCESSOR |
| ST20-GP6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
| ST20GP6CT33S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
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