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参数资料
型号： AT90USB1287-MUR
厂商： Atmel
文件页数： 48/106页
文件大小： 0K
描述： MCU AVR 128K FLASH 16MHZ 64QFN
产品培训模块： MCU Product Line Introduction
megaAVR Introduction
标准包装： 1,000
系列： AVR® 90USB
核心处理器： AVR
芯体尺寸： 8-位
速度： 16MHz
连通性： EBI/EMI，I²C，SPI，UART/USART，USB，USB OTG
外围设备： 欠压检测/复位，POR，PWM，WDT
输入/输出数： 48
程序存储器容量： 128KB（128K x 8）
程序存储器类型： 闪存
EEPROM 大小： 4K x 8
RAM 容量： 8K x 8
电压 - 电源 (Vcc/Vdd)： 2.7 V ~ 5.5 V
数据转换器： A/D 8x10b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 64-VFQFN 裸露焊盘
包装： 带卷 (TR)
46
7593L–AVR–09/12
AT90USB64/128
be calibrated to any frequency in the range 7.3 - 8.1MHz within ±10% accuracy. Calibration out-
side that range is not guaranteed.
Note that this oscillator is used to time EEPROM and Flash write accesses, and these write
times will be affected accordingly. If the EEPROM or Flash are written, do not calibrate to more
than 8.8MHz. Otherwise, the EEPROM or Flash write may fail.
The CAL7 bit determines the range of operation for the oscillator. Setting this bit to 0 gives the
lowest frequency range, setting this bit to 1 gives the highest frequency range. The two fre-
quency ranges are overlapping, in other words a setting of OSCCAL = 0x7F gives a higher
frequency than OSCCAL = 0x80.
The CAL6..0 bits are used to tune the frequency within the selected range. A setting of 0x00
gives the lowest frequency in that range, and a setting of 0x7F gives the highest frequency in the
range. Incrementing CAL6..0 by 1 will give a frequency increment of less than 2% in the fre-
quency range 7.3 - 8.1MHz.
7.6
External clock
The device can utilize a external clock source as shown in Figure 7-3. To run the device on an
external clock, the CKSEL fuses must be programmed as shown in Table 7-1 on page 41.
Figure 7-3.
External clock drive configuration.
When this clock source is selected, start-up times are determined by the SUT fuses as shown in
Table 7-9.
When applying an external clock, it is required to avoid sudden changes in the applied clock fre-
quency to ensure stable operation of the MCU. A variation in frequency of more than 2% from
one clock cycle to the next can lead to unpredictable behavior. If changes of more than 2% is
required, ensure that the MCU is kept in Reset during the changes.
Table 7-9.
Start-up times for the external clock selection.
Power conditions
Start-up time from power-
down and power-save
Additional delay from
reset (VCC = 5.0V)
SUT1..0
BOD enabled
6CK
14CK
00
Fast rising power
6CK
14CK + 4.1ms
01
Slowly rising power
6CK
14CK + 65ms
10
Reserved
11
NC
EXTERNAL
CLOCK
SIGNAL
XTAL2
XTAL1
GND
相关PDF资料
PDF描述
AT90USB1287-AUR MCU AVR 128K FLASH 16MHZ 64TQFP
VE-BTF-IX CONVERTER MOD DC/DC 72V 75W
VI-B3X-IX-F2 CONVERTER MOD DC/DC 5.2V 75W
VE-BTF-IW CONVERTER MOD DC/DC 72V 100W
VI-B3X-IW-F4 CONVERTER MOD DC/DC 5.2V 100W
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