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ATMEGA48V-10AUR 参数 Datasheet PDF下载

ATMEGA48V-10AUR图片预览
型号: ATMEGA48V-10AUR
PDF下载: 下载PDF文件 查看货源
内容描述: [RISC Microcontroller, 8-Bit, FLASH, AVR RISC CPU, 10MHz, CMOS, PQFP32, 7 X 7 MM, 1 MM HEIGHT, 0.80 MM PITCH, GREEN, PLASTIC, MS-026ABA, TQFP-32]
分类和应用: 闪存微控制器
文件页数/大小: 376 页 / 4764 K
品牌: ATMEL [ ATMEL ]
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ATmega48/88/168  
Problem Fix/Workaround  
The first case can be avoided during run-mode by ensuring that only one reset source is  
active. If an external reset push button is used, the reset start-up time should be selected  
such that the reset line is fully debounced during the start-up time.  
The second case can be avoided by not using the system clock prescaler.  
The third case occurs during In-System programming only. It is most frequently seen when  
using the internal RC at maximum frequency.  
If the device gets stuck in the reset-state, turn power off, then on again to get the device out  
of this state.  
3. Interrupts may be lost when writing the timer registers in the asynchronous timer  
If one of the timer registers which is synchronized to the asynchronous timer2 clock is writ-  
ten in the cycle before an overflow interrupt occurs, the interrupt may be lost.  
Problem Fix/Workaround  
Always check that the Timer2 Timer/Counter register, TCNT2, does not have the value 0xFF  
before writing the Timer2 Control Register, TCCR2, or Output Compare Register, OCR2.  
The only safe time to write to any of the Timer2 registers in asynchronous mode is in a com-  
pare interrupt routine where the compare register is not 0xFF, or if the compare register is  
0xFF, after a delay of at least one asynchronous clock cycle from the start of the interrupt.  
34.3 Errata ATmega168  
The revision letter in this section refers to the revision of the ATmega168 device.  
34.3.1  
Rev C  
Interrupts may be lost when writing the timer registers in the asynchronous timer  
1. Interrupts may be lost when writing the timer registers in the asynchronous timer  
If one of the timer registers which is synchronized to the asynchronous timer2 clock is writ-  
ten in the cycle before an overflow interrupt occurs, the interrupt may be lost.  
Problem Fix/Workaround  
Always check that the Timer2 Timer/Counter register, TCNT2, does not have the value 0xFF  
before writing the Timer2 Control Register, TCCR2, or Output Compare Register, OCR2.  
The only safe time to write to any of the Timer2 registers in asynchronous mode is in a com-  
pare interrupt routine where the compare register is not 0xFF, or if the compare register is  
0xFF, after a delay of at least one asynchronous clock cycle from the start of the interrupt.  
34.3.2  
Rev B  
Part may hang in reset  
Interrupts may be lost when writing the timer registers in the asynchronous timer  
1. Part may hang in reset  
Some parts may get stuck in a reset state when a reset signal is applied when the internal  
reset state-machine is in a specific state. The internal reset state-machine is in this state for  
approximately 10 ns immediately before the part wakes up after a reset, and in a 10 ns win-  
dow when altering the system clock prescaler. The problem is most often seen during In-  
361  
2545M–AVR–09/07  
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