參數(shù)資料
型號(hào): UPD77015GC
廠商: NEC Corp.
元件分類: 數(shù)字信號(hào)處理
英文描述: 16 bits, Fixed-point Digital Signal Processor
中文描述: 16位定點(diǎn)數(shù)字信號(hào)處理器
文件頁(yè)數(shù): 25/60頁(yè)
文件大?。?/td> 424K
代理商: UPD77015GC
25
μ
PD77015, 77017, 77018
(b) Modifying data pointers
Data pointers are modified after memory access. The results are valid immediately after instruction execution.
It is impossible to modify without memory access.
Description
Operation
DPn
No operation: DPn value does not change.
DPn++
DPn
DPn+1
DPn–
DPn
DPn–1
DPn##
DPn
DPn + DNn: Adds DN0-DN7 corresponding to DP0-DP7
Example
DP0
DP0 + DN0
DPn%%
(n = 0 - 3) DPn = ((DP
L
+ DNn )mod (DMX + 1)) + DP
H
(n = 4 - 7) DPn = ((DP
L
+ DNn )mod (DMY + 1)) + DP
H
!DPn##
Access memory after DPn value is bit-reversed
After memory access, DPn
DPn + DNn
DPn##imm
DPn
DPn + imm
(c) Concurrent processing instructions
G
G
shows concurrent processing instruction.
Instruction names are shown in abbreviation.
TRI
: Trinomial
DYAD
: Dyadic
MONAD : Monadic
TRANS
: Inter-register transfer
IMM
: Immediate data set
BR
: Branch
LOOP
: Hardware loop
CTR
: Control
(d) State of Overflow flag (OV)
The following marks show the
μ
PD77017 overflow flag state.
: Not affected
: 1 is set when the result of operation is overflow.
Caution
If overflow does not occur after operation, OV is not reset, and keeps the state before operation.
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