User’s Manual U13045EJ2V0UM00
65
CHAPTER 4 CPU ARCHITECTURE
4.3.3 Table indirect addressing
[Function]
Table contents (branch destination address) of the particular location to be addressed by the lower 5-bit
immediate data of an instruction code from bit 1 to bit 5 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 spaces.
[Illustration]
4.3.4 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]
15
1
15
0
PC
7
0
Low Addr.
High Addr.
Memory (Table)
Effective a 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
Instruction code
7
0
rp
0
7
A
X
15
0
PC
8
7
Содержание mPD789101
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