參數(shù)資料
型號: μPD750100
廠商: NEC Corp.
英文描述: 32 Bit Single Chip Microcontrollers(32位單片微控制器)
中文描述: 32位單片機微控制器(32位單片微控制器)
文件頁數(shù): 27/66頁
文件大小: 417K
代理商: ΜPD750100
μ
PD705100
27
10.1 Addressing Mode
The V830 generates two types of addresses, as follows:
Instruction addresses (used by instructions involving branching)
Operand addresses (used by instructions which access data)
10.1.1 Instruction addresses
The instruction address is determined by the contents of the program counter (PC). Each time an instruction is
executed, it is automatically incremented by 2 or 4, depending on the number of bytes constituting the instruction being
fetched. When a branch instruction is executed, the branch address is set in the PC by the following addressing mode:
(1) Relative addressing (to PC)
The signed 9 or 26 bits (displacement, or disp) of data contained in the operation code are added to the program
counter (PC). For this addition, the displacement is handled as twos complement data. Bit 8 or 25 is the sign
bit, respectively.
The JR, JAL, Bcond, and ABcond instructions use this addressing.
Addressing for JR and JAL instructions
Sign extension
0
0
0
0
0
0
PC
PC
31
31
31
S
26 25
disp 26
+
Addressing for Bcond and ABcond instructions
Sign extension
PC
31
0
0
S
9 8
0
0
31
31
PC
0
0
disp 9
+
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