MikroElektronika PIC Microcontrollers PIC16 Manuel d'utilisateur télécharger pdf (Page 86)

mikroBASIC

- Basic Compiler for Microchip PIC microcontrollers

If number is converted from less complex to more complex data type, upper byte

is filled with zeros;

If number is converted from more complex to less complex data type, data is sim-

ply truncated (upper bytes are lost).

Example for unsigned and logical operators :

dim teA as byte

dim Bb as word

main:

Bb = $F0F0

teA = $aa

Bb = Bb and teA

' Bb becomes $00a0

end.

In this case, A is treated as a word with upper byte equal to 0 prior to the opera-

tion.

If number is converted from less complex data type to more complex, upper bytes

are filled with ones if sign bit is 1 (number is negative); upper bytes are filled with

zeros if sign bit is 0 (number is positive).

If number is converted from more complex data type to less complex, data is sim-

ply truncated (upper bytes are lost).

dim Sa as short

dim Sbb as integer

main:

Sbb = $70FF

Sa = -12

Sbb = Sbb and Sa

' Bb becomes $70f4

end.

In this case, Sa is treated as an integer with the upper byte equal to $FF (this in

fact is sign extending of short to integer) prior to the operation.

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