SLAS191A datasheet(58/86 Pages) TI

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3–2

3.3

Peripheral Hardware/Registers

Do not modify the following peripheral registers and bits because UART operation uses these register and

bits.

Table 3–1. Peripheral Registers and Bits

ADDRESS

BITS

TCDAT

44h

All

TCPLD

43h

All

TCCTL

42h

All

IFG1

02h

IE1

00h

P0IES

14h

1, 2

P0DIR

12h

1, 2

P0IFG

13h

P0IE

15h

3.4

RAM Locations for the Monitor

The Monitor Program uses eighteen bytes of RAM, from address 200h to 212h, within the RAM area of the

MPS430x32x (which ranges from 200h to 3FFh for the MSPx32x family, and 200h to 5FFh for the MSPx33x

family). The user application should not use this memory area.

The Monitor Program needs no stack while running the user application. If the user application returns to

the Monitor Program using a breakpoint, single step, or keyboard interrupt, an additional stack size of 32h

bytes is needed for the Monitor Program. This Monitor Program stack is always set up on the top of the user

stack. When returning to the user application, the Monitor Program clears the entire user stack. If the user

program is inactive and the Monitor Program is running, 50 bytes are put onto the stack. The stack pointer

shown in Figure 3–3 reflects the application situation, not the actual Monitor stack pointer. In these 50 bytes,

all register data valid in the application program is saved to be restored when the user application is

reactivated. Returning to the user application, the 50 bytes used are freed, and the stack pointer is pointing

to the user application.

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