NEC uPD78P078Y Manuale Utente
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CHAPTER 5 CPU ARCHITECTURE
5.3.3 Table indirect addressing
[Function]
Table contents (branch destination address) of the particular location to be addressed by bits 1 to 5 of the
immediate data of an operation code are transferred to the program counter (PC) and branched.
Table indirect addressing is carried out when the CALLT [addr5] instruction is executed. This instruction can
refer to the address stored in the memory table 40H to 7FH and branch to all the memory space.
[Illustration]
15
1
15
0
PC
7
0
Low Addr.
High Addr.
Memory (Table)
Effective Address+1
Effective Address
0
1
0
0
0
0
0
0
0
0
8
7
8
7
6
5
0
0
1
1
1
7
6
5
1
0
ta
4–0
Operation Code