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參數(shù)資料
| 型號： | MPC505 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Highly Integrated, Low-Power, 32-Bit Microcontroller |
| 中文描述： | 32-BIT, RISC MICROCONTROLLER, PQFP16 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 68K |
| 代理商： | MPC505 |
Application Note
Interrupt Basics
AN1281
MOTOROLA
3
causes the processor to take a floating point interrupt. The specific
interrupt with the vector offset of 0x0500 is called the
external interrupt
to distinguish it from other interrupts.
In Motorola terminology, interrupts are one type of exception, and all
interrupts share vector offset 0x00500. Interrupt “sources” originate
interrupt service requests. These sources include the external interrupt
pins (IRQ0 through IRQ6), the periodic interrupt timer (PIT) and on-chip
peripheral residing on the intermodule bus. Each source is identified by
a “l(fā)evel”. Some interrupt sources, specifically the IRQ3 through IRQ6
pins, have fixed levels. Other levels can be assigned by the system
designer.
Table 2
is a summary of interrupt sources and levels.
When an interrupt occurs, its corresponding level is set in the 32-bit
interrupt request pending (IRQPEND) register. Each bit represents one
level, hence up to 32 levels (or sources) are possible. This allows for
future expansion of interrupt sources in the MPC505.
Table 2. Sources Versus Levels
Source
Level
External Pins:
IRQ0
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
Assignable between 0:31
Assignable between 0:31
Assignable between 0:31
6
8
10
12
Internal:
PIT
IMB Peripheral
Assignable between 0:31
(Future)
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