參數(shù)資料
型號: AT90USB647-AUR
廠商: Atmel
文件頁數(shù): 17/106頁
文件大小: 0K
描述: MCU AVR 64K FLASH 16MHZ 64TQFP
產(chǎn)品培訓模塊: MCU Product Line Introduction
megaAVR Introduction
標準包裝: 1
系列: AVR® 90USB
核心處理器: AVR
芯體尺寸: 8-位
速度: 16MHz
連通性: EBI/EMI,I²C,SPI,UART/USART,USB,USB OTG
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數(shù): 48
程序存儲器容量: 64KB(64K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 2K x 8
RAM 容量: 4K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
數(shù)據(jù)轉換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-TQFP
包裝: 剪切帶 (CT)
配用: ATSTK600-RC17-ND - STK600 ROUTING CARD AVR
其它名稱: AT90USB647-AURCT
18
7593L–AVR–09/12
AT90USB64/128
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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