IBM uPD78082 - Manual (Page 66)

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CHAPTER 3 CPU ARCHITECTURE
7 0
rp
0 7
A X
15 0
PC
8 7
3.3.4 Register addressing
[Function]
Register pair (AX) contents to be specified with an instruction word are transferred to the program counter (PC)
and branched.
This function is carried out when the BR AX instruction is executed.
[Illustration]