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參數(shù)資料
| 型號： | AT75C1010 |
| 英文描述： | AT75C1010 Telephony Software Module [Updated 11/01. 29 Pages] This software module runs on the OakDSPCore subsystem of the AT75 series SIAP. expanding its capabilities and making the processor flexible and east to integrate into most operating systems. |
| 中文描述： | AT75C1010電話軟件模塊[更新11/01。 29頁]本軟件模塊上運行的AT75系列OakDSPCore子系統(tǒng)統(tǒng)計所。擴大其能力，使處理器的靈活和東部地區(qū)融入大多數(shù)操作系統(tǒng)。 |
| 文件頁數(shù)： | 88/171頁 |
| 文件大?。?/td> | 1288K |
| 代理商： | AT75C1010 |
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23
AT75C DSP Subsystem
1368C–INTAP–08/02
Programming Model
and Registers
Most of the OakDSPCore’s visible registers are arranged as a global register set of 34
registers that can be accessed by most data moves and core operations.
The registers are listed below, organized according to the units’ partition. Additional
details on each register can be found in the description of each unit and in the following
paragraphs.
Status Registers
Three status registers are available to hold the flags, status bits, control bits, user I/O
bits and paging bits for direct addressing. The contents of each register and their field
definitions are described below.
Status Register 0
Z: Zero
Set if the ALU/BFO/Barrel Shifter output used at the last instruction equals zero; cleared otherwise. This flag is also used to
indicate the result of the test bit/s instructions (TST0, TST1, TSTB).
The zero flag is cleared during processor reset.
The zero flag can be modified by writing to ST0.
M: Minus
Set if ALU/BFO/Barrel Shifter output used at the last instruction is a negative number; cleared otherwise. The minus flag is
the same as the MSB of the output (bit 35).
The minus flag is cleared during processor reset.
The minus flag can be modified by writing to ST0.
N: Normalized
Set if the 32 LSBs of the ALU/Barrel Shifter output used at the last instruction are normalized; cleared otherwise, i.e., set if
.
The normalized flag is cleared during processor reset. The normalized flag can be modified by writing to ST0.
V: Overflow
Set if an arithmetic overflow (36-bit overflow) occurs after an arithmetic operation; cleared otherwise. It indicates that the
result of an operation cannot be represented in 36 bits.
C: Carry
Set if an addition operation generates a carry or if a subtract generates a borrow; cleared otherwise. It also accepts the
rotated bit or the last bit shifted out of the 36-bit result.
The carry flag is cleared during processor reset.
The carry flag can be modified by writing to ST0.
E: Extension
Set if bits 35 to 31 of the ALU/Barrel Shifter output used at the last instruction are not identical; cleared otherwise. If the E
flag is cleared, it indicates that the 4 MSBs of the output are the sign-extension of bit 31 and can be ignored.
The extension flag is cleared during processor reset.
The extension flag can be modified by writing to ST0.
L: Limit
The L flag has two functions: to latch the overflow (V) flag and to indicate limitation during accumulator move or LIM
operations.
15
14
13
12
11
10
9
8
A0E
Z
M
N
V
76
54
32
10
C
E
L
R
IM1
IM0
IE
SAT
Z
bit 31
bit 30
⊕
() E
∩
∪
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