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| 型号： | EP20K100BC324-3 |
| 厂商： | ALTERA CORP |
| 元件分类： | PLD |
| 英文描述： | LOADABLE PLD, PBGA324 |
| 文件页数： | 9/68页 |
| 文件大小： | 975K |
| 代理商： | EP20K100BC324-3 |
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17
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
programming the BOOTRST Fuse, see “Boot Loader Support – Read-While-Write Self-Pro-
5.8.1
Interrupt Behavior
When an interrupt occurs, the Global Interrupt Enable I-bit is cleared and all interrupts are dis-
abled. The user software can write logic one to the I-bit to enable nested interrupts. All enabled
interrupts can then interrupt the current interrupt routine. The I-bit is automatically set when a
Return from Interrupt instruction – RETI – is executed.
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 Vector
in order to execute the interrupt handling routine, and hardware clears the corresponding inter-
rupt 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..
Assembly Code Example
in
r16, SREG
; store SREG value
cli
; disable interrupts during timed sequence
sbi
EECR, EEMWE
; start EEPROM write
sbi
EECR, EEWE
out
SREG, r16
; restore SREG value (I-bit)
C Code Example
char
cSREG;
cSREG = SREG;
/* store SREG value */
/* disable interrupts during timed sequence */
_CLI();
EECR |= (1<<EEMWE); /* start EEPROM write */
EECR |= (1<<EEWE);
SREG = cSREG;
/* restore SREG value (I-bit) */
相关PDF资料 |
PDF描述 |
|---|---|
| EP20K100BI324-1 | LOADABLE PLD, PBGA324 |
| EP20K100BI324-2 | LOADABLE PLD, PBGA324 |
| EP20K100BI324-3 | LOADABLE PLD, PBGA324 |
| EP20K100BC484-1 | LOADABLE PLD, PBGA484 |
| EP20K100BC484-2 | LOADABLE PLD, PBGA484 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EP20K100BC356-1 | 功能描述:FPGA - 现场可编程门阵列 CPLD - APEX 20K 416 Macro 252 IOs RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 栅极数量: 逻辑块数量:943 内嵌式块RAM - EBR:1956 kbit 输入/输出端数量:128 最大工作频率:800 MHz 工作电源电压:1.1 V 最大工作温度:+ 70 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-256 |
| EP20K100BC356-1ES | 制造商:未知厂家 制造商全称:未知厂家 功能描述:FPGA |
| EP20K100BC356-1V | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| EP20K100BC356-2 | 功能描述:FPGA - 现场可编程门阵列 CPLD - APEX 20K 416 Macro 252 IOs RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 栅极数量: 逻辑块数量:943 内嵌式块RAM - EBR:1956 kbit 输入/输出端数量:128 最大工作频率:800 MHz 工作电源电压:1.1 V 最大工作温度:+ 70 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-256 |
| EP20K100BC356-2ES | 制造商:未知厂家 制造商全称:未知厂家 功能描述:FPGA |
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