SLAS191A datasheet(61/86 Pages) TI

61 / 86 page

3–5

3.5

Writing Data Into the EPROM

When data is written into the EPROM address range, software code is written into RAM locations 214h to

23Dh. All addresses 1000h or higher are assumed to be EPROM. After the write operation is completed,

the code in the RAM is no longer needed. The code is written into RAM when a write into the EPROM address

range is performed. Ensure that the data in these locations are not needed when the EPROM write code

is temporarily loaded into those locations.

A write into EPROM can be done when an application program is executed, or when the monitor is active.

For example, when the mx[n] command is executed:

Available RAM for

User Application

RAM Area Always Reserved

for ROM Monitor

214h

212h

200h

RAM Area Always Reserved

for ROM Monitor

212h

214h

200h

Temporary

Burn Routine

23Dh

23Eh

Available RAM for

User Application

No write to EPROM active

Figure 3–4. Temporary Burn Routine in the MSP430x32x RAM Area

User application data for the MSP430X33x family should be located within the RAM area (from 200h to

5FFh). The locations used statically (200h to 214h), and dynamically (stack) by the Monitor Program limit

the size of the available RAM.

NOTE:

The Identification Bit Pattern defines if the monitor code or a user’s code (program) is

executed after a power-up or hardware reset (PUC). See Section 5.2. The Temporary

Burn Routine user’s addresses are allocated for the EPROM burn routine which must

run in the RAM. When data is written into the EPROM (program memory), code in the

EPROM can not be executed. Therefore, the burn program has to be in the RAM (loaded

from the EPROM so it can be executed).

SLAS191A Datasheet(PDF) 61 Page - Texas Instruments