參數(shù)資料
型號(hào)： ATDH1160VPC-
廠商： Atmel
文件頁(yè)數(shù)： 8/54頁(yè)
文件大?。?/td> 0K
描述： BOARD PROGRAMMING ISP 3V/5V
標(biāo)準(zhǔn)包裝： 1
類型： ISP（系統(tǒng)內(nèi)可重復(fù)編程）
適用于相關(guān)產(chǎn)品： *
所含物品： 板，線纜，軟件和文檔
Atmel-ISP Software
Atmel ATF15xx Family: ISP Devices User Guide
3-5
Self-Calibrate
This option is intended to help you if you are having problems getting
the Atmel-ISP software to communicate between your PC’s parallel
port and either your circuit board or the Atmel-ISP board. When this
option runs, the software dynamically adjusts the communication
speed between the parallel port on your PC and the Atmel ISP
devices in your JTAG chain.
If the self-calibration process is successful, the software was able to
find a reliable transfer speed to communicate with your hardware. It
will save this transfer speed as long as the main menu remains open.
If you save your chain file after running the Self-Calibrate option, the
transfer speed will also be saved. Therefore, the next time you run
the software with this chain file, it will communicate at the specified
transfer speed in the chain file.
If the self-calibration process fails, the software automatically selects
the slowest transfer rate. It will use this rate for all further ISP opera-
tions unless the self-calibration process is repeated and the software
selects a faster transfer rate. If you do not use this option, the soft-
ware defaults to using the fastest transfer speed to communicate with
your hardware.
With V3.00 or later ATMISP software versions, this self-calibration
process will be automatically run when a chain file is executed for the
first time.
Manual
Calibration
This option is available in V3.00 or later software versions. It allows
you to directly control the transfer speed of the data between the par-
allel port on your PC and the JTAG device on your board. This feature
is useful when you are trying to communicate with your board with a
long (greater than 3 feet) parallel port cable.
Long cables can reduce signal rise and fall times and possibly create
crosstalk between JTAG interface signals. The combination or indi-
vidual contribution of these effects may cause programming or verify
errors. Using the Manual Calibration setting allows you to adjust the
transfer rate to minimize these effects from interfering with program-
ming. There are 4095 settings to choose from: 1 is the fastest setting
and 4095 is the slowest.
To use this feature, select this command and enter a number
between 1 and 4095. The default value is 1. The value selected will
be displayed as the calibration constant in the Chain File window. If
you are using a previously saved chain file, the Atmel-ISP software
will retain your calibration setting. Otherwise, it will default to using
the fastest speed.
Exit
This command exits the ISP software. If your chain file was not saved
before exiting, the ISP software will prompt you to save it. If you click
No, the chain file contents will be lost.
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