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參數(shù)資料
| 型號： | UPD77210GJ-8EN |
| 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 PROCESSOR |
| 中文描述： | 16位定點(diǎn)數(shù)字信號處理器 |
| 文件頁數(shù)： | 41/74頁 |
| 文件大?。?/td> | 467K |
| 代理商： | UPD77210GJ-8EN |
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Data Sheet U15203EJ3V0DS
41
μ
PD77210, 77213
(b) Modifying data pointer
The data pointer is modified only after memory access. The result of the modification becomes valid starting
from the instruction that is executed immediately after. The data pointer cannot be modified without the
memory access.
Example
Operation
DPn
Nothing is executed (value of DPn is not changed).
DPn++
DPn
←
DPn + 1
DPn
DPn
←
DPn
1
DPn##
DPn
←
DPn + DNn
(Value of DN0 to DN7 corresponding to DP0 to DP7 is added.)
Example: DP0
←
DP0 + DN0
(n = 0 to 3) DPn = ((DP
L
+ DNn) mod (DMX + 1)) + DP
H
DPn%%
(n = 4 to 7) DPn = ((DP
L
+ DNn) mod (DMY + 1)) + DP
H
!DPn##
Reverses bits of DPn and then accesses DPn.
After memory access, DPn
←
DPn + DNn
DPn## imm
DPn
←
DPn + imm
(c) Instructions that can be described simultaneously
Those instructions that can be described simultaneously are indicated by
√
.
(d) Status of overflow flag (OV)
The status of the overflow flag is indicated by the following symbols:
: No change
Caution If an overflow does not occur after an operation, the overflow flag is not reset and its status
remains the same as before the operation.
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