The extended addressing mode is used only for JSR and JMP instructions. The 14-bit address is located in the lowest 14 bits of the encoding after the two-bit opcode.
Example:
XDEF Entry
XREF target
data: DS.B 1
MyCode: SECTION
Entry:
main: LDA #$55
JMP target
In this example a jump is executed at an address defined by the external symbol target.