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): 34/141頁
文件大?。?/td> 374K
代理商: ΜPD703008
CHAPTER 4 ADDRESS SPACE
22
4.2.2 Operand address
When an instruction is executed, the register or memory area to be accessed is specified in one of the following
four addressing modes:
(1) Register addressing
The general register (may be system register) specified in the general register specification field is accessed as
operand. This addressing mode applies to instructions using the operand format reg1, reg2, or regID.
(2) Immediate addressing
The 5-bit or 16-bit data for manipulation is contained directly in the instruction. This addressing mode applies
to instructions using the operand format imm5, imm16, vector, or cccc.
Remark
vector : Operand that is 5-bit immediate data to specify trap vector (00H-1FH), and is used in TRAP
instruction.
cccc
: Operand consisting of 4-bit data used in SETF instruction to specify condition code. Assigned
as part of instruction code as 5-bit immediate data by appending 1-bit 0 above highest bit.
(3) Based addressing
The following two types of based addressing are supported:
(a) Type 1
The address of the data memory location to be accessed is determined by adding the value in the specified
general register to the 16-bit displacement value contained in the instruction. This addressing mode applies
to instructions using the operand format disp16 [reg1].
Figure 4-5. Based Addressing
31
reg1
0
Memory to be manipulated
31
16 15
disp16
0
Sign extension
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