參數(shù)資料
型號: UPD77112
廠商: NEC Corp.
元件分類: 數(shù)字信號處理
英文描述: 16-BIT FIXED-POINT DIGITAL SIGNAL PROCESSORS
中文描述: 16位定點(diǎn)數(shù)字信號處理器
文件頁數(shù): 35/80頁
文件大?。?/td> 451K
代理商: UPD77112
Data Sheet U12801EJ4V0DS00
35
μ
PD77110, 77111, 77112
(b) Modifying data pointer
The data pointer is modified after the memory has been accessed. The result of modification becomes valid
starting from the instruction that immediately follows. The data pointer cannot be modified.
Example
Operation
DPn
Nothing is done (value of DPn is not changed.)
DPn++
DPn
DPn + 1
DPn
DPn
DPn
1
DPn##
DPn
DPn + DNn
(Adds value of corresponding DN0 to DN7 to DP0 to DP7.)
Example: DP0
DP0 + DN0
(n = 0 - 3) DPn = ((DP
L
+ DNn) mod (DMX + 1)) + DP
H
DPn%%
(n = 4 - 7) DPn = ((DP
L
+ DNn) mod (DMY + 1)) + DP
H
!DPn##
Reverses bits of DPn and then accesses memory.
After memory access, DPn
DPn + DNn
DPn##imm
DPn
DPn + imm
(c) Instructions that can be simultaneously written
Instructions that can be simultaneously written are indicated by O.
(d) Status of overflow flag (OV)
The status of the overflow flag is indicated by the following symbol:
z
: Not affected
: Set to 1 when overflow occurs
Caution If an overflow does not occur as a result of an operation, the overflow flag is not reset but
retains the status before the operation.
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