SLAS191A datasheet(70/86 Pages) TI

70 / 86 page

5–4

5.3

Special Treatment of <ESC> in the Software UART

The software UART treats a received ESC character in two different ways:

•

The software UART receives the ESC character and stores it at address 210h. The condition,

therefore, is that bit 0 in memory location 200h is reset.

•

The software UART receives the ESC and returns back to the Hyperterminal. The condition is

that bit 0 in memory location 200h be set.

End of ROM-Monitor

Interrupt Service Routine

Contents of

Memory Location

3DEh is AA55h for

MSP430X32x

(or 5DEh is AA55h

for MSP430X33x)

yes

Bit 0 in Memory

Location 200h Set ?

Received Character

is <ESC>

Normal Return Out of

INT_RXTX

Interrupt

Service

The Return From Interrupt

is By-Passed

Into ROM-

Monitor

Figure 5–2. Special Treatment of ESC

BIC

#01h,&200h

; reset bit 0, because no special treatment of <ESC> is

; wanted

BIS

#01h,&200h

; reset bit 0, because special treatment of <ESC> is

; wanted

NOTE: Memory Location 200h

Only bit 0 in memory location 200h may be modified. A modification of the higher bits may result

in an unpredictable behavior of the terminal program.

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