ST20C2 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST20C2

Instruction Set Reference Manual

STMicroelectronics 

The length of the object that stores a signed integer can be increased (i.e. the object

size can be increased). This operation is known as ‘sign extension’. The extra bits that

are allocated for the larger object, are meaningful to the value of the signed integer.

They must therefore be set to the appropriate value. The value for all these extra bits

is in fact the same as the value of the most significant bit - i.e. the sign bit - of the

smaller object. The ST20 provides instructions that sign extend byte and half-word to

word, and 32 bits to 64 bits.

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