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C251 User's Guide
C251 Introduction Compiling Programs Language Extensions Preprocessor 
Advanced Programming Customization Files 
Startup Code Variable Initialization Code Basic I/O Memory Allocation Optimizer General Optimizations 251-Specific Optimizations Options for Code Generation Global Register Coloring Segment Naming Conventions Segment Types Initialization Segments Function Symbols Parameter Passing Symbols Hardware Stack Calculating Stack Size Interfacing C Programs to Assembler Global Variables Function Parameters Passing in Memory Passing in Registers Function Return Values Using the SRC Directive Register Usage Overlaying Segments TINY Model XTINY Model SMALL Model XSMALL Model LARGE Model Data Storage Formats Bit Variables 1-Byte Scalars 2-Byte Scalars 4-Byte Scalars Floating-point Numbers Floating-point Errors Double Numbers Double Errors Absolute Memory Locations Absolute Access Macros Linker Location Controls The _at_ Keyword Debugging Error Messages Library Reference AppendixVariable Initialization Code
These files contain the routines for data initialization of variables that were explicitly initialized in the C source file. INITEDAT.A51 performs the initialization for variables located in the data, idata and near memory space; INITHDAT.A51 initializes the xdata, far and huge memory space.
If your system is equipped with a watchdog timer, you can integrate a watchdog refresh into the initialization code using the watchdog macro. This macro needs to be defined only if the initialization takes longer than the watchdog cycle time. If you use an 801C251SB, the macro could be defined as follows:
WATCHDOG MACRO
MOV WDTTRST,#01EH
MOV WDTRST,#0E1H
ENDM
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