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參數(shù)資料
| 型號： | MC68HC812A4 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Primarily as an Expanded Mode Microcontroller |
| 中文描述： | 主要作為擴展單片機模式 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 194K |
| 代理商： | MC68HC812A4 |
Engineering Bulletin
Software Setup Using P&E’s SDBUG12 Program
EB350
MOTOROLA
3
Software Setup Using P&E’s SDBUG12 Program
When using a software debugger in special expanded narrow mode, it is
important to note that the mode register has to be modified.
To start the program, simply get into the directory where the executable
is loaded. Type
sdbug12 freq x000000
where x is the A4EVB’s bus
speed.
When this command is typed, either COM1 or COM2 can be used.
Contact P&E Microcomputer Systems, Inc., at its Web site,
www.pemicro.com, for specifics.
Once the SDBUG12 screen is displayed, execute a register modify to
ensure the software is communicating properly with the PC. Type
A 55
and watch the screen value for the A accumulator value change. Reset
it to 0 by typing
A 00
and observe the A accumulator value change.
So far, the microcontroller is in special single-chip mode. For expanded
narrow mode functionality, the mode register needs to be written twice
with $39 which will provide access to external peripherals in expanded
narrow format and gain access to the bus in 8-bit mode where the data
is provided on data lines d8 to d15.
Make sure the chip select control register (CSCTL) has CSP0 enabled.
Execute a memory modify command by typing
mm 3C
,and when the
enter key is pressed, the debugger will provide the current value and
designate a field to place the new value in. If the register does not show
the proper value ($20) for CSP0 to be enabled, set it to the proper value.
To check U6B’s accessibility, simply execute a memory modify
command at a memory location inside the RAM’s address space. Type
mm <address>
, and the command will respond with the current value
and prompt for the new value.
If this is successful, download an S19 record to the microcontroller,
provided that the record is within RAM’s range.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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