參數(shù)資料
型號: μPD70F3008
廠商: NEC Corp.
英文描述: 16/32 Bit Single Chip Microcontrollers(16/32 位單片微控制器)
中文描述: 16/32位單片機微控制器(16/32位單片微控制器)
文件頁數(shù): 69/141頁
文件大?。?/td> 374K
代理商: ΜPD70F3008
57
CHAPTER 5 INSTRUCTION
MULH
Multiply Half-word
Instruction format
(1) MULH reg1, reg2
(2) MULH imm5, reg2
Operation
(1) GR [reg2] (32)
GR [reg2] (16)
×
GR [reg1] (16)
(2) GR [reg2]
GR [reg2]
×
sign-extend (imm5)
Format
(1) Format I
(2) Format II
Op code
15
0
(1)
rrrrr000111RRRRR
15
0
(2)
rrrrr010111iiiii
Flag
CY
OV
S
Z
SAT
Instruction
(1) MULH Multiply Half-word by Register
(2) MULH Multiply Half-word by Immediate (5-bit)
Explanation
(1) Multiplies the lower half-word data of general register reg2 by the half-word data of general
register reg1, and stores the result to general register reg2 as word data. The data of
general register reg1 is not affected.
(2) Multiplies the lower half-word data of general register reg2 by a 5-bit immediate data, sign-
extended to half-word length, and stores the result to general register reg2.
Remark
The higher 16 bits of general registers reg1 and reg2 are ignored in this operation.
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