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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： | 6/55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
In-System Programming (ISP)
In-System Programming (ISP) is performed without re-
moving the microcontroller from the system. The In-Sys-
tem Programming (ISP) facility consists of a series of
internal hardware resources coupled with internal firm-
ware to facilitate remote programming of the XA through
the serial port.
The In-System Programming (ISP) facility has made in-
circuit programming in an embedded application possible
with a minimum of additional expense in components
and circuit board area.
The ISP function uses five pins: TxD, RxD, V
SS, and VPP
(see Figure 4). Only a small connector needs to be avail-
able to interface your application to an external circuit in
order to use this feature. The V
PP supply should be ad-
equately decoupled and V
PP not allowed to exceed data
sheet limits.
Using In-System Programming (ISP)
ISP mode is entered by holding PSEN low, asserting,
un-asserting RESET, then releasing PSEN. When ISP
mode is entered, the default loader first disables the
watchdog timer to prevent a watchdog reset from occur-
ring during programming.
The ISP feature allows for a wide range of baud rates to
be used in the application, independent of the oscillator
frequency. It is also adaptable to a wide range of oscilla-
tor frequencies. This is accomplished by measuring the
bit-time of a single bit in a received character. This infor-
mation is then used to program the baud rate in terms of
timer counts based on the oscillator frequency. The ISP
feature requires that an initial character (a lowercase f)
be sent to the XA to establish the baud rate. The ISP
firmware provides auto-echo of received characters.
Once baud rate initialization has been performed, the
ISP firmware will only accept specific Intel Hex-type
records. Intel Hex records consist of ASCII characters
used to represent hexadecimal values and are summa-
rized below:
:NNAAAARRDD..DDCC<crlf>
In the Intel Hex record, the “NN” represents the number
of data bytes in the record. The XA will accept up to 16
(10H) data bytes. The "AAAA"” string represents the ad-
dress of the first byte in the record. If there are zero
bytes in the record, this field is often set to 0000. The
"RR" string indicates the record type. A record type of
"00" is a data record. A record type of "01" indicates the
XTAL2
RST
VCC
VPP
+12V±5% or VDD SUPPLY
5V ±5%
TxD
RxD
VDD
FOR USE WITH WINISP
VxD
RxD
XTAL1
VSS
Figure 4. In-System Programming with a Minimum of Pins
VSS
2
3
5
FEMALE
DB - 9
RS - 232
TRANSCEIVER
MC145406, MAX232,
OR EQUIVALENT
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