NEC 78K/0 Series - Manual (Page 23)

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CHAPTER 3 ADDRESSING
User's Manual U12326EJ4V0UM
3.1.4 Register addressing
[Function]
The register pair (AX) contents to be specified by 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]
7 0
rp
0 7
A X
15 0
PC
8 7