71M6523-DB Maxim Integrated Products, 71M6523-DB Datasheet - Page 47

• Manufacturer Part Number: 71M6523-DB
• Description: Power Management Modules & Development Tools 71M6521D 68 QFN DEMO BOARD
• Manufacturer: Maxim Integrated Products

71M652X Software User’s Guide
Before the MPU gets to execute the main() program, it will execute the startup instructions contained in the
STARTUP.A51 assembly program (Figure 5-1). Upon completion, STARTUP.A51 causes a jump to the label
C_START, which is contained in the second startup assembly program named init.A51 (Keil/C51/LIB directory, see
Figure 5-2). Init.A51 finally causes the jump to main(). The startup files are described in section 5.10 .
The stack is located at 0x80, growing to higher values, while the reentrant stack is located at 0xFF, growing down-
wards.
Once operating, the main() program (Figure 5-4 )expects regular interrupts from the CE. If no interrupts occur, the
main() program will cease to trigger the watchdog timer, resulting in a reset condition, if the watchdog timer is enabled.
The main() program calls the main_init() (Figure 5-4) and the main_run() (Figure 5-5) routines. main_init() is used for
hardware and software initialization, main_run() is the routine that is executed in an endless loop and that takes care of
background and foreground processing.
Revision 1.7
no
© Copyright 2005-2007 TERIDIAN Semiconductor Corporation
Process WD Overflow flag
Clear PB and WAKE flags
Set WAKE timer to 7s
BROWNOUT mode?
Reset Watchdog
Enter LCD mode
PB pressed?
main_run()
main_init()
main()
Figure 5-3: main() Program
TERIDIAN Proprietary
yes
yes
no
Clear PB and WAKE flags
Enter SLEEP mode
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