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ZBasic Language Reference
72
ZX Microcontroller Family
Caution: modifying this value will probably cause your program to malfunction.
Register.SP
This UnsignedInteger register contains the value of the hardware stack pointer of the underlying
processor at the moment it is referenced. For VM code devices, there are few, if any, practical uses for
this value. See, instead, Register.UserSP. For native mode devices, the value of Register.SP is identical
to Register.UserSP and indicates the value of the current task’s stack pointer at moment it is referenced.
Caution: modifying this value will probably cause your program to malfunction.
3.9 Built-in Constants
The compiler has several built-in constants. These constants may be used in conditional directives and
they may also be used as if they were constants defined by the normal means. The entries in the table
below that begin with Option typically derive their value from the corresponding Option directives, the
corresponding compiler command line options or their respective default values.
Name
Type
Description
Module.Name
String
The name of the module being compiled.
Module.Number
UnsignedInteger The ordinal number of the module being compiled.
Option.AllocStr
Boolean
Indicates if dynamic string allocation is in effect.
Option.AtnChar
Byte
Gives the value of the ATN character (if non-zero).
Option.Base
Integer
Gives the array base value for the current module.
Option.CodeLimit
UnsignedLong
Specifies the code size limit (zero if none is specified).
Option.Com1Speed
Long
Gives the current default Com1 baud rate.
Option.CPUFamily
String
The family to which the target device belongs, e.g. “ATmega” or
“ATxmega”.
Option.CPUType
String
Specifies the CPU used on the target device.
Option.ExtRamAble
Boolean
Indicates if the device supports external RAM use.
Option.ExtRamEnabled
Boolean
Indicates if external RAM use is enabled.
Option.HeapLimit
UnsignedInteger Indicates the specified heap limit.
Option.HeapReserve
UnsignedInteger Indicates the default or specified minimum heap size.
Option.HeapSize
UnsignedInteger Indicates the specified or default heap size.
Option.Language
String
Specifies the language mode that is in effect.
Option.MainTaskStackSize
UnsignedInteger Indicates the specified size for the main task stack.
Option.Objects
Boolean
Indicates if object-oriented extensions are enabled.
Option.Overload
Boolean
Indicates if procedure overloading is enabled.
Option.PortPinEncoding
Boolean
Indicates port pin encoding is enabled.
Option.Strict
Boolean
Indicates if Strict mode is in effect.
Option.StringSize
Integer
Gives the default string size for static string allocation.
Option.TargetCode
String
The type of code being generated (“ZVM” or “Native”).
Option.TargetDevice
String
The ZX device for which code is being compiled, e.g. “ZX24a”.
Pin.GreenLED
Byte
Gives the pin designator for the green LED (if available).
Pin.RedLED
Byte
Gives the pin designator for the red LED (if available).
Pin.YellowLED
Byte
Gives the pin designator for the yellow LED (if available).
System.JumpBufSize
Integer
Gives the size required for a buffer used for SetJmp().
System.MinQueueSize
Integer
Gives the minimum size for an array to be used for a queue.
Version.Major
Integer
Gives the major portion of the compiler version number.
Version.Minor
Integer
Gives the minor portion of the compiler version number.
Version.Variant
Integer
Gives the variant portion of the compiler version number.
Version.Value
UnsignedLong
Gives the composite value of the compiler version number.
The value corresponding to v1.2.3 is &H010203.
Version.String
String
Gives the compiler version number as a string, e.g. “1.2.3”.
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