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| 型号： | ATICE50MEM |
| 厂商： | Atmel |
| 文件页数： | 32/73页 |
| 文件大小： | 0K |
| 描述： | ICE50 EXTENSION MEMORY CARD |
| 标准包装： | 1 |
| 附件类型： | ICE50 内存扩展卡 |
| 适用于相关产品： | 100 引脚 megaAVR 设备 |
| 产品目录页面： | 615 (CN2011-ZH PDF) |
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General Description
Figure 3-25. External Clock
Enable
XTAL1
Enable
XTAL2
3.7.1.1
3.7.1.2
3.7.2
3.7.3
3-18
Available Clock
Options
ICE50 Probe version
A9902.3.1200.E
External Clock
Signal
Internal Clock Signal
Provided by AVR
Studio
The current version of the Probe has some restrictions with regards to clock options
support. The unsupported clock modes are quite easy to emulate with simple
workarounds as described in Section 3.7.6 and Section 3.7.7. The Probe version can be
found on top of the back side of the Probe (left side of the right picture above).
Version A9902.3.1200.E of the Probe supports the following clock options:
External Clock Signal
Internal Clock Signal provided by AVR Studio
External 32 kHz RTC Crystal
Internal Calibrated RC Oscillator
The following clock options are not supported by Probe version A9902.3.1200.C. A
description for workarounds for the unsupported clock modes can be found in section
An external clock signal can be applied to the XTAL1 pin on the emulator probe. The
Emulator can then be set up to use this signal as the system clock. See device selection
for a description of how to set up AVR Studio for this option. The clock signal must meet
Table 3-7. Clock Signal Conditions
Value
Frequency
5KHz to 20MHz
Duty cycle
50%
Absolute maximum input voltage
1.8 - 7.0V
Recommended input voltage
1.8 - 5.5V
Minimum high level input voltage
1.7V
Maximum low level input voltage
0.5V
The Emulator may be set up to run on an internal programmable clock. The frequency
range of this programmable clock is 5 kHz to 20 MHz. However, the maximum fre-
quency cannot be set higher than the speed limit of the actual part. Only certain output
frequencies are possible to generate with highest accuracy. However the clock genera-
tor generally produces an output frequency within 0.1% of the desired output frequency.
If the target application should run on the same clock as the AVR chip/emulator, the
internal programmable clock may be driven out on the XTAL2 pin. See section device
selection for a description of how to set up the internal programmable clock.
ICE50 User Guide
2523A–AVR–11/02
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