Ultra Start 16xx Manuel d'utilisateur télécharger pdf (Page 30)

MEB/0404

In System Programming Options

Self Programming

Bootstrap Loader

 9600/38400 BPS

 UART format

 256 bit password protected

JTAG

 IEEE 1149 interface

 Programming and

emulation

 Permanent security fuse

 60KB <3s

 Any Flash location

 Use any interface

 Hardware controlled

 As fast 22us/byte

The Flash memory of the MSP430 can be programmed very fast using several different

methods.

•The Flash is segmented into 512B main memory segments with two additional 128B information

memory segments. The only difference between main and information memory is size – code

and data can be located anywhere. The total number of main memory segments depends on the

device - for example, a 4KB device has eight main memory segments.

•Flash memory operates from 1.8V – 3.6V, but at least 2.7V must be present during

programming or erasing. Flash can be erased and reprogrammed 100k times with 100 year data

retention typical. Because of an advanced design, 60kB of Flash can be programmed in as fast

as 2 seconds. For security reasons, Flash can not be programmed or erased unless a password

is used when the Flash control registers are accessed.

•There are three methods of programming Flash; Out or in-system using JTAG, a Bootstrap

Loader (BSL) or in system using normal software.

•The Flash Emulation Tool (FET) from TI, the MSP430-GANG430 programmer from TI, and

many third parties offer MSP430-JTAG programmers. You can even build your own JTAG

programmer – an application report is available at www.ti.com/msp430.

•The bootstrap loader is a section of ROM code that resides on the device itself and allows

communication using a common 9600 baud UART protocol. Information regarding the BSL is

also available on the MSP430 website.

•The time to program any bit, byte or word is 35/f(FTG) – where FTG is between 257kHz –

476kHz. This means that the programming time for any bit, byte or word is as fast as 74us. If

memory are programmed sequentially, the programming time can be reduced to 42us.

•Because Flash is so easy to program in system, in many cases it can be used to replace an

external EEPROM for non-volatile storage.

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Ultra Start 16xx Manuel d'utilisateur Page 30