參數(shù)資料
型號: μPD703008
廠商: NEC Corp.
英文描述: 16/32 Bit RISC Microcontrollers(16/32位RISC微控制器)
中文描述: 16/32位RISC微控制器(16/32位的RISC微控制器)
文件頁數(shù): 31/141頁
文件大?。?/td> 374K
代理商: ΜPD703008
19
CHAPTER 4 ADDRESS SPACE
4.2 Addressing Mode
The CPU generates two types of addresses: instruction addresses used for instruction fetch and branch operations;
and operand addresses used for data access.
4.2.1 Instruction address
An instruction address is determined by the contents of the program counter (PC), and is automatically incremented
(+2) according to the number of bytes of an instruction to be fetched each time an instruction has been executed.
When a branch instruction is executed, the branch destination address is loaded into the PC using one of the following
two addressing modes:
(1) Relative address (PC relative)
The signed 9- or 22-bit data of an instruction code (displacement: disp) is added to the value of the program
counter (PC). At this time, the displacement is treated as 2’s complement data with bits 8 and 21 serving as
sign bits.
This addressing is used for Bcond disp9, JR disp22, and JARL disp22, reg2 instructions.
Figure 4-2. Relative Addressing (JR disp22/JARL disp22, reg2)
31
24 23
0
0
0 0 0 0 0 0
PC
0
0
31
22 21
Sign extension
S
disp22
0
0
31
24 23
0
0
0 0 0 0 0 0
PC
0
0
Memory to be manipulated
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