SLAS191A datasheet(60/86 Pages) TI

60 / 86 page

3–4

The user application data is located within the RAM area from 272h to 3FEh (5FEh for 33x). The locations

used statically (200h to 214h) and dynamically (stack) by the Monitor Program limit the size of the available

RAM. Due to limited size, two memory configurations are recommended as shown in Figure 3–3.

Interrupt Vectors

Identification Bit Pattern

Address Range for

Program, Stack and

Data of User

Application is 3DCh

to 214h

NOTE:

The User

Application Does

Not Set the Stack

Pointer SP

RAM Area Always Reserved

for ROM Monitor

3FEh

3E0h

3DEh

3DCh

214h

212h

200h

Interrupt Vectors

Identification Bit Pattern

Maximum Program,

Stack and Data Size

of User Application

Is Reduced by 50

Bytes, After Return

to the Monitor

Program

Stack Used by

Application

RAM Area Always Reserved

For ROM Monitor

3FEh

3E0h

3DEh

212h

214h

Stack Needed From

ROM Monitor, 50 Bytes

200h

User application inactive,

Monitor Program active

single step, breakpoint,

<ESC>

User application active

NOTE:

The identification bit pattern determines 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 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

cannot be executed. Therefore, the burn program has to be in RAM (loaded from the

EPROM) so it can be executed.

Figure 3–3. RAM Area 200h to 3FFh for the MSP430x32x Family

In most cases it is efficient not to initialize the user-stack, but to use the stack pointer set by the monitor.

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