MX10EXA 查看數據表（PDF） - Macronix International

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比赛名单

MX10EXA

XA 16-bit Microcontroller Family 64K Flash/2K RAM, Watchdog, 2UARTs

Macronix International 

VCC

RST

XTAL2

VPP

VDD

VxD

RxD

XTAL1

VSS

MX10EXA

+12V±5% or VDD SUPPLY

FOR USE WITH WINISP

5V ±5%

TxD

RxD

VSS

RS - 232

TRANSCEIVER

MC145406, MAX232,

OR EQUIVALENT

2

3

5

FEMALE

DB - 9

Figure 4. In-System Programming with a Minimum of Pins

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 , and V

SS

PP

(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 VPP supply should be ad-

equately decoupled and VPP 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

P/N:PM0625 Specifications subject to change without notice, contact your sales representatives for the most update information. REV. 1.0, JUL. 01, 2005

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