参数资料
型号: AT90USB1287-MUR
厂商: Atmel
文件页数: 47/106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)
45
7593L–AVR–09/12
AT90USB64/128
Note:
1. These options should only be used if frequency stability at start-up is not important for the
application.
7.5
Calibrated internal RC oscillator
The calibrated internal RC oscillator by default provides a 8.0MHz clock. The frequency is nomi-
nal value at 3V and 25
°C. The device is shipped with the CKDIV8 Fuse programmed. See
“System clock prescaler” on page 47 for more details. This clock may be selected as the system
clock by programming the CKSEL Fuses as shown in Table 7-7. If selected, it will operate with
no external components. During reset, hardware loads the calibration byte into the OSCCAL
Register and thereby automatically calibrates the RC oscillator. At 3V and 25
°C, this calibration
gives a frequency of 8MHz ±10%. The oscillator can be calibrated to any frequency in the range
7.3 - 8.1MHz within ±10% accuracy, by changing the OSCCAL register. When this oscillator is
used as the chip clock, the Watchdog Oscillator will still be used for the Watchdog Timer and for
the Reset Time-out. For more information on the pre-programmed calibration value, see Section
Notes:
1. The device is shipped with this option selected.
2. The frequency ranges are preliminary values. Actual values are TBD.
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.
When this oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Note:
1. The device is shipped with this option selected.
7.5.1
OSCCAL – Oscillator Calibration Register
Bits 7..0 – CAL7..0: Oscillator calibration value
The Oscillator Calibration Register is used to trim the calibrated internal RC oscillator to remove
process variations from the oscillator frequency. The factory-calibrated value is automatically
written to this register during chip reset, giving an oscillator frequency of 8.0MHz at 25°C. The
application software can write this register to change the oscillator frequency. The oscillator can
Table 7-7.
Internal calibrated RC oscillator operating modes
Frequency range (2) [MHz]
CKSEL3..0
7.3 - 8.1
0010
Table 7-8.
Start-up times for the internal calibrated RC oscillator 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 (1)
10
Reserved
11
Bit
7654
3
2
1
0
CAL7
CAL6
CAL5
CAL4
CAL3
CAL2
CAL1
CAL0
OSCCAL
Read/write
R/W
Initial value
Device specific calibration value
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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