The following constants are pre-defined by the compiler:
| Child pages (Children Display) | ||
|---|---|---|
|
Constant Table
| TRUE | Logical true: | -1 | ($FFFFFFFF) |
| FALSE | Logical false: | 0 | ($00000000) |
| POSX | Maximum positive integer: | 2147483647 | ($7FFFFFFF) |
| NEGX | Maximum negative integer: | -2147483648 | ($80000000) |
| PI | Floating-point value for PI: | ≈ 3.141593 | ($40490FDB) |
| RCFAST | Internal fast oscillator: | $00000001 | (%00000000001) |
| RCSLOW | Internal slow oscillator: | $00000002 | (%00000000010) |
| XINPUT | External clock/oscillator: | $00000004 | (%00000000100) |
| XTAL1 | External low-speed crystal: | $00000008 | (%00000001000) |
| XTAL2 | External medium-speed crystal: | $00000010 | (%00000010000) |
| XTAL3 | External high-speed crystal: | $00000020 | (%00000100000) |
| PLL1X | External frequency times 1: | $00000040 | (%00001000000) |
| PLL2X | External frequency times 2: | $00000080 | (%00010000000) |
| PLL4X | External frequency times 4: | $00000100 | (%00100000000) |
| PLL8X | External frequency times 8: | $00000200 | (%01000000000) |
| PLL16X | External frequency times 16: | $00000400 | (%10000000000) |
(All of these constants are also available in Propeller Assembly.)
TRUE and FALSE
TRUE and FALSE are usually used for Boolean comparison purposes:
| Code Block |
|---|
if (X = TRUE) or (Y = FALSE)
<code to execute if total condition is true> |
POSX and NEGX
POSX and NEGX are typically used for comparison purposes or as a flag for a specific event:
| Code Block |
|---|
if Z > NEGX
<code to execute if Z hasn't reached smallest negative> |
—or—
...
| ) |
...
PI
PI can be used for floating-point calculations, either floating-point constants or floating-point variable values using the FloatMath and FloatString object.
RCFAST through PLL16X
RCFAST through PLL16X are Clock Mode Setting constants. They are explained in further detail in the _CLKMODE section.
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