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参数资料
| 型号： | PMF18WE1 |
| 厂商： | Microchip Technology |
| 文件页数： | 24/98页 |
| 文件大小： | 0K |
| 描述： | PROCESSOR MODULE FOR ICE4000 |
| 标准包装： | 1 |
| 模块/板类型： | 处理器模块 |
| 适用于相关产品： | ICE4000 |
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MPLAB ? ICE 4000 User’s Guide
3.6.2
Using a Target Board Clock
MPLAB ICE 4000 can use the processor clock on the target board as long as target
board (external) power is being used. It can determine the frequency of the target board
clock and use it for displaying timing information.
1. Select the target board Oscillator Type ( Section 3.3.3 “Oscillator Settings” ).
2. Select the Power tab of the Debugger>Settings dialog and set Processor Power
Board” ).
3. Select the Clock tab on the Debugger>Settings dialog. Then select Use Target
Board Clock.
Note:
If MPLAB ICE 4000 is not hooked up to a target board and you click
Use Target Board Clock , you will get a warning dialog.
The target board clock frequency will be calculated, displayed and used for any
internal time calculations. A warning is issued if the frequency is less than 32
kHz.
Because of measurement error, the calculated frequency may not be what is
desired for internal time calculations. (e.g., Your crystal oscillator has a frequency
of 8 MHz ± 50 ppm, but the target frequency is shown as 7.993755.)
Measurement error can range from 3.9% to a fraction of a percent.
4. Click Apply .
3.7
SETTING UP MISCELLANEOUS HARDWARE
In addition to the settings you have already made, there are other settings that you may
or may not wish to change in the Debugger>Settings dialog. Depending on the device
you have chosen, these tabs may or may not be available and may look different for
different devices.
3.7.1
Settings Dialog, Break Options Tab
Use the Break Options tab to change the global break and trace point environment
options. These include Global Hardware Break Enable (for complex trigger usage) and
Freeze Peripherals on Halt. If enabled in the configuration bits
( Configure>Configuration Bits ), you may set stack and watchdog timer break options.
3.7.2
Settings Dialog, Memory Tab
Some parts allow device memory to be supplemented or replaced by off-chip (external)
memory. Memory modes are selected using configuration bits
( Configure>Configuration Bits ).
Devices that support Microcontroller mode only do not have a Memory tab. Devices
that support Extended Microcontroller mode and/or Microprocessor mode will display
the Memory tab.
DS51490A-page 18
Note:
There are several limitations concerning external memory, some of them
device-dependent. Please see the limitations section of the on-line help file
for more information.
? 2004 Microchip Technology Inc.
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