参数资料
型号: AT90USB647-AU
厂商: Atmel
文件页数: 45/106页
文件大小: 0K
描述: IC AVR MCU 64K 64TQFP
产品培训模块: megaAVR Introduction
标准包装: 450
系列: AVR®
应用: USB 微控制器
核心处理器: AVR
程序存储器类型: 闪存(64 kB)
控制器系列: AT90 USB
RAM 容量: 4K x 8
接口: 2 线串行,SPI 串行,USART,USB
输入/输出数: 48
电源电压: 2.7 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-TQFP,64-VQFP
包装: 托盘
供应商设备封装: 64-TQFP
配用: ATSTK600-RC17-ND - STK600 ROUTING CARD AVR
ATSTK525-ND - KIT STARTER FOR AT90USB
AT90USBKEY2-ND - KIT DEMO FOR AT90USB
其它名称: AT90USB647-16AU
AT90USB647-16AU-ND
43
7593L–AVR–09/12
AT90USB64/128
Figure 7-2.
Crystal oscillator connections.
The low power oscillator can operate in three different modes, each optimized for a specific fre-
quency range. The operating mode is selected by the fuses CKSEL3..1 as shown in Table 7-3.
Notes:
1. The frequency ranges are preliminary values. Actual values are TBD.
2. This option should not be used with crystals, only with ceramic resonators.
3. If 8MHz frequency exceeds the specification of the device (depends on V
CC), the CKDIV8
Fuse can be programmed in order to divide the internal frequency by 8. It must be ensured
that the resulting divided clock meets the frequency specification of the device.
The CKSEL0 Fuse together with the SUT1..0 fuses select the start-up times as shown in Table
Table 7-3.
Low power crystal oscillator operating modes (3).
Frequency range (1) [MHz]
CKSEL3..1
Recommended range for capacitors C1
and C2 [pF]
0.4 - 0.9
100 (2)
0.9 - 3.0
101
12 - 22
3.0 - 8.0
110
12 - 22
8.0 - 16.0
111
12 - 22
Table 7-4.
Start-up times for the low power crystal oscillator clock selection.
Oscillator source /
power conditions
Start-up time from
power-down and
power-save
Additional delay
from reset
(V
CC = 5.0V)
CKSEL0
SUT1..0
Ceramic resonator, fast
rising power
258CK
14CK + 4.1ms (1)
000
Ceramic resonator, slowly
rising power
258CK
14CK + 65ms (1)
001
Ceramic resonator, BOD
enabled
1KCK
14CK (2)
010
Ceramic resonator, fast
rising power
1KCK
14CK + 4.1ms (2)
011
Ceramic resonator, slowly
rising power
1KCK
14CK + 65ms (2)
100
XTAL2
XTAL1
GND
C2
C1
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