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ATMEGA2560 参数 Datasheet PDF下载

ATMEGA2560图片预览
型号: ATMEGA2560
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器与256K字节的系统内可编程闪存 [8- BIT Microcontroller with 256K Bytes In-System Programmable Flash]
分类和应用: 闪存微控制器
文件页数/大小: 407 页 / 2985 K
品牌: ATMEL [ ATMEL ]
 浏览型号ATMEGA2560的Datasheet PDF文件第54页浏览型号ATMEGA2560的Datasheet PDF文件第55页浏览型号ATMEGA2560的Datasheet PDF文件第56页浏览型号ATMEGA2560的Datasheet PDF文件第57页浏览型号ATMEGA2560的Datasheet PDF文件第59页浏览型号ATMEGA2560的Datasheet PDF文件第60页浏览型号ATMEGA2560的Datasheet PDF文件第61页浏览型号ATMEGA2560的Datasheet PDF文件第62页  
Figure 25. Reset Logic  
DATA BUS  
MCU Status  
Register (MCUSR)  
Power-on Reset  
Circuit  
Brown-out  
Reset Circuit  
BODLEVEL [2..0]  
Pull-up Resistor  
SPIKE  
FILTER  
JTAG Reset  
Register  
Watchdog  
Oscillator  
Delay Counters  
Clock  
CK  
Generator  
TIMEOUT  
CKSEL[3:0]  
SUT[1:0]  
Table 23. Reset Characteristics(1)  
Symbol Parameter  
Condition  
Min  
Typ  
Max Units  
Power-on Reset Threshold  
Voltage (rising)  
TBD TBD TBD  
V
VPOT  
Power-on Reset Threshold  
TBD TBD TBD  
TBD TBD TBD  
TBD TBD TBD  
V
V
Voltage (falling)(2)  
VRST  
tRST  
RESET Pin Threshold Voltage  
Minimum pulse width on RESET  
Pin  
ns  
Notes: 1. Values are guidelines only. Actual values are TBD.  
2. The Power-on Reset will not work unless the supply voltage has been below VPOT  
(falling)  
Power-on Reset  
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detec-  
tion level is defined in Table 23. The POR is activated whenever VCC is below the  
detection level. The POR circuit can be used to trigger the start-up Reset, as well as to  
detect a failure in supply voltage.  
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reach-  
ing the Power-on Reset threshold voltage invokes the delay counter, which determines  
how long the device is kept in RESET after VCC rise. The RESET signal is activated  
again, without any delay, when VCC decreases below the detection level.  
58  
ATmega640/1280/1281/2560/2561  
2549A–AVR–03/05  
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