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参数资料
| 型号： | MX10EXAUI |
| 厂商： | MACRONIX INTERNATIONAL CO LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 30 MHz, MICROCONTROLLER, PQFP44 |
| 封装： | 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, LQFP-44 |
| 文件页数： | 7/55页 |
| 文件大小： | 476K |
| 代理商： | MX10EXAUI |
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P/N:PM0625 Specifications subject to change without notice, contact your sales representatives for the most update information. REV. 1.0, JUL. 01, 2005
MX10EXA
end-of-file mark. In this application, additional record types
will be added to indicate either commands or data for the
ISP facility. The maximum number of data bytes in a
record is limited to 16 (decimal). ISP commands are sum-
marized in Table 1.
As a record is received by the XA, the information in the
record is stored internally and a checksum calculation is
performed. The operation indicated by the record type is
not performed until the entire record has been received.
Should an error occur in the checksum, the XA will send
an "X" out the serial port indicating a checksum error. If
the checksum calculation is found to match the
checksum in the record, then the command will be ex-
ecuted. In most cases, successful reception of the record
will be indicated by transmitting a "." character out the
serial port (displaying the contents of the internal pro-
gram memory is an exception).
In the case of a Data Record (record type 00), an addi-
tional check is made. A "." character will NOT be sent
unless the record checksum matched the calculated
checksum and all of the bytes in the record were suc-
cessfully programmed. For a data record, an "X" indi-
cates that the checksum failed to match, and an "R"
character indicates that one of the bytes did not prop-
erty program.
The ISP facility was designed so that specific crystal
frequencies were not required in order to generate baud
rates or time the programming pulses.
User Supplied Loader
A user program can simply decide at any time, for any
reason, to begin Flash programming operations. All it has
to do in advance is to instruct external circuitry to apply
+5V or +12V to the V
PP pin, and make certain that the
Boot ROM is enabled. User code may contain a loader
designed to replace the application code contained in
the Flash memory by loading new code through any com-
munication medium available in the application. This is
completely flexible and defined by the designer of the
system. It could be done serially using RS-232, serially
using some other method, or even parallel over a user
defined I/O port. The user has the freedom to choose a
method that does not interfere with the application cir-
cuit. As an added feature, the application program may
also use the Flash memory as a long term data storage,
saving configuration information, sensor readings, or any
other desired data.
The actual loader code would typically be programmed
by the user into the microcontroller in a parallel fashion
or via the default loader during their manufacturing pro-
cess. The entire initial Flash contents may be programmed
at that time, or the rest of the application may be pro-
grammed into the Flash memory at a later time, possibly
using the loader code to do the programming.
This application controlled programming capability allows
for the possibility of changing the application code in the
field. If the application circuit is embedded in a PC, or
has a way to establish a telephone data link to a user’s
or manufacturer’s computer, new code could be down-
loaded from diskette or a manufacturer’s support sys-
tem. There is even the possibility of conducting very
specialized remote testing of a failing circuit board by
the manufacturer by remotely programming a series of
detailed test programs into the application board and
checking the results.
Any user supplied loader should take the watchdog timer
into account. Typically, the watchdog timer would be dis-
abled upon entry to the loader if it might be running, in
order to prevent a watchdog reset from occurring during
programming.
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