參數(shù)資料
型號(hào): μPD70F3003
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(jī)微控制器(16/32位單片微控制器)
文件頁數(shù): 65/141頁
文件大?。?/td> 374K
代理商: ΜPD70F3003
53
CHAPTER 5 INSTRUCTION
LDSR
Load to System Register
Instruction format
LDSR reg2, regID
Operation
SR [regID]
GR [reg2]
Format
Format IX
Op code
15
0 31
16
rrrrr111111RRRRR 0000000000100000
Remark
The fields used to define reg1 and reg2 are swapped in this instruction. Normally,
"RRR" is used for reg1 and is the source operand while “rrr” signifies reg2 and is
the destination operand. In this instruction, “RRR” is still the source operand, but
is represented by reg2, while “rrr” is the special register destination, as labeled
below:
rrrrr: regID specification
RRRRR: reg2 specification
Flag
CY
OV
S
Z
SAT
– (Refer to
Remark
below.)
– (Refer to
Remark
below.)
– (Refer to
Remark
below.)
– (Refer to
Remark
below.)
– (Refer to
Remark
below.)
Instruction
LDSR Load to System Register
Explanation
Loads the word data of general register reg2 to a system register specified by the system
register number (regID). The data of general register reg2 is not affected.
Remark
If the system register number (regID) is equal to 5 (PSW register), the values of the
corresponding bits of the PSW are set according to the contents of reg2. This only affects the
flag bits, the reserved bits remain at 0. Also, interrupts are not sampled when the PSW is being
written with a new value. If the ID flag is enabled with this instruction, interrupt disabling begins
at the start of execution, even though the ID flag does not become valid until the beginning of
the next instruction.
Caution
The system register number regID is a number which identifies a system register. Accessing
system registers which are reserved or write-prohibited is prohibited and will lead to undefined
results.
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