Datasheet

5–2
The flow chart in Figure 5–1 I illustrates the entry point of the INT_RXTX interrupt service routine:
INT_P0.1
no yes
Identification ?
Contents Of Memory
Location 3DEh
= AA55h
P0.1 Interrupt Continues Program Execution
Upon The User Interrupt Vector Stored In
Memory Location 3F8h
User Interrupt Service Routine Branches
To INT_RXTX Service Routine From
ROM-Monitor ?
(First Instruction = CALL &0FFDAh ?)
yes
no
Start Of Monitor Interrupt
Service Routine INT_RXTX
User Interrupt
Service Routine is
Continued
Receive/Transmit Interrupt Service
Routine
Half Duplex Software
UART Prepared For
Receive or Transmit ?
(PREPRX or PREPTX)
Interrupt Service Handler For Transmit Interrupt Service Handler For Receive
TX RX
Figure 5–1. Identification of Bit Pattern AA55h for the MSP430X32x Family