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參數(shù)資料
| 型號： | ATF16V8B-15SU |
| 廠商： | Atmel |
| 文件頁數(shù)： | 6/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC PLD EE 15NS 20-SOIC |
| 標準包裝： | 37 |
| 系列： | 16V8 |
| 可編程類型： | EE PLD |
| 宏單元數(shù)： | 8 |
| 輸入電壓： | 5V |
| 速度： | 15ns |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 20-SOIC W |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 610 (CN2011-ZH PDF) |
14
7707F–AVR–11/10
AT90USB82/162
There are basically two types of interrupts. The first type is triggered by an event that sets the
Interrupt Flag. For these interrupts, the Program Counter is vectored to the actual Interrupt Vec-
tor in order to execute the interrupt handling routine, and hardware clears the corresponding
Interrupt Flag. Interrupt Flags can also be cleared by writing a logic one to the flag bit position(s)
to be cleared. If an interrupt condition occurs while the corresponding interrupt enable bit is
cleared, the Interrupt Flag will be set and remembered until the interrupt is enabled, or the flag is
cleared by software. Similarly, if one or more interrupt conditions occur while the Global Interrupt
Enable bit is cleared, the corresponding Interrupt Flag(s) will be set and remembered until the
Global Interrupt Enable bit is set, and will then be executed by order of priority.
The second type of interrupts will trigger as long as the interrupt condition is present. These
interrupts do not necessarily have Interrupt Flags. If the interrupt condition disappears before the
interrupt is enabled, the interrupt will not be triggered.
When the AVR exits from an interrupt, it will always return to the main program and execute one
more instruction before any pending interrupt is served.
Note that the Status Register is not automatically stored when entering an interrupt routine, nor
restored when returning from an interrupt routine. This must be handled by software.
When using the CLI instruction to disable interrupts, the interrupts will be immediately disabled.
No interrupt will be executed after the CLI instruction, even if it occurs simultaneously with the
CLI instruction. The following example shows how this can be used to avoid interrupts during the
timed EEPROM write sequence..
When using the SEI instruction to enable interrupts, the instruction following SEI will be exe-
cuted before any pending interrupts, as shown in this example.
Assembly Code Example
in
r16, SREG
; store SREG value
cli
; disable interrupts during timed sequence
sbi
EECR, EEMPE
; start EEPROM write
sbi
EECR, EEPE
out
SREG, r16
; restore SREG value (I-bit)
C Code Example
char
cSREG;
cSREG = SREG; /* store SREG value */
/* disable interrupts during timed sequence */
__disable_interrupt();
EECR |= (1<<EEMPE); /* start EEPROM write */
EECR |= (1<<EEPE);
SREG = cSREG; /* restore SREG value (I-bit) */
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ATF16V8B-15SU SL383 | 制造商:Atmel Corporation 功能描述:SPLD ATF16V8B Family 250 Gates 8 Macro Cells 62MHz 5V 20-Pin SOIC 制造商:Atmel Corporation 功能描述:SPLD ATF16V8B Family 250 Gates 8 Macro Cells 62MHz CMOS Technology 5V 20-Pin SOIC 制造商:Atmel 功能描述:SPLD ATF16V8B Family 250 Gates 8 Macro Cells 62MHz CMOS Technology 5V 20-Pin SOIC 制造商:Atmel 功能描述:SPLD ATF16V8B Family 250 Gates 8 Macro Cells 62MHz 5V 20-Pin SOIC |
| ATF16V8B-15XC | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Highperformance EE PLD |
| ATF16V8B-15XI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Electrically-Erasable PLD |
| ATF16V8B-15XU | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Highperformance EE PLD |
| ATF16V8B-25GC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Electrically-Erasable PLD |
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