Datasheet

FFFFF

0000C

Lower 64 KB

0FFFF

10000

PC.19:0

±32 KB

PC.19:0

±32 KB

Addressing Modes

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Figure 4-20. Overflow and Underflow for Symbolic Mode

Length: Two or three words

Operation: The sign-extended 16-bit index in the next word after the instruction is added to the

20 bits of the PC. This delivers a 20-bit address, which points to an address in the

range 0 to FFFFFh. The operand is the content of the addressed memory location.

Comment: Valid for source and destination. The assembler calculates the PC index and

inserts it

ADD.W EDE,&TONI ;

Example:

This instruction adds the 16-bit data contained in source word EDE and destination

word TONI and places the 16-bit result into the destination word TONI. For this

example, the instruction is located at address 2F034h.

Source: Word EDE at address 3379Ch, pointed to by PC + 4766h, which is the 16-bit result

of 3379Ch – 2F036h = 04766h. Address 2F036h is the location of the index for this

example.

Destination: Word TONI located at address 00778h pointed to by the absolute address 00778h

134

CPUX SLAU144J–December 2004–Revised July 2013

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