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参数资料
| 型号： | MA330011 |
| 厂商： | Microchip Technology |
| 文件页数： | 170/199页 |
| 文件大小： | 0K |
| 描述： | MODULE DSPIC33 100P TO 100QFP |
| 标准包装： | 1 |
| 附件类型： | 插拔式模块（PIM）- dsPIC33FJ256GP710 |
| 适用于相关产品： | Explorer 16（DM240001 或 DM240002） |
| 产品目录页面： | 658 (CN2011-ZH PDF) |
| 相关产品： | DSPIC33FJ64GP710T-I/PT-ND - IC DSPIC MCU/DSP 64K 100TQFP DSPIC33FJ64GP710T-I/PF-ND - IC DSPIC MCU/DSP 64K 100TQFP DSPIC33FJ64GP310T-I/PT-ND - IC DSPIC MCU/DSP 64K 100TQFP DSPIC33FJ64GP310T-I/PF-ND - IC DSPIC MCU/DSP 64K 100TQFP DSPIC33FJ256GP510T-I/PT-ND - IC DSPIC MCU/DSP 256K 100TQFP DSPIC33FJ256GP510T-I/PF-ND - IC DSPIC MCU/DSP 256K 100TQFP DSPIC33FJ128GP310T-I/PT-ND - IC DSPIC MCU/DSP 128K 100TQFP DSPIC33FJ128GP310T-I/PF-ND - IC DSPIC MCU/DSP 128K 100TQFP DSPIC33FJ256GP710T-I/PT-ND - IC DSPIC MCU/DSP 256K 100TQFP DSPIC33FJ256GP710T-I/PF-ND - IC DSPIC MCU/DSP 128K 100TQFP 更多... |
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dsPIC33F
DS70165E-page 70
Preliminary
2007 Microchip Technology Inc.
3.4.3
MODULO ADDRESSING
APPLICABILITY
Modulo Addressing can be applied to the Effective
Address (EA) calculation associated with any W
register. It is important to realize that the address
boundaries check for addresses less than, or greater
than, the upper (for incrementing buffers) and lower (for
decrementing buffers) boundary addresses (not just
equal to). Address changes may, therefore, jump
beyond boundaries and still be adjusted correctly.
3.5
Bit-Reversed Addressing
Bit-Reversed Addressing mode is intended to simplify
data re-ordering for radix-2 FFT algorithms. It is
supported by the X AGU for data writes only.
The modifier, which may be a constant value or register
contents, is regarded as having its bit order reversed. The
address source and destination are kept in normal order.
Thus, the only operand requiring reversal is the modifier.
3.5.1
BIT-REVERSED ADDRESSING
IMPLEMENTATION
Bit-Reversed Addressing mode is enabled when:
1.
BWM
bits
(W
register
selection)
in
the
MODCON register are any value other than ‘15’
(the
stack
cannot
be
accessed
using
Bit-Reversed Addressing).
2.
The BREN bit is set in the XBREV register.
3.
The addressing mode used is Register Indirect
with Pre-Increment or Post-Increment.
If the length of a bit-reversed buffer is M = 2N bytes,
the last ‘N’ bits of the data buffer start address must
be zeros.
XB<14:0> is the Bit-Reversed Address modifier, or
‘pivot point’, which is typically a constant. In the case of
an FFT computation, its value is equal to half of the FFT
data buffer size.
When enabled, Bit-Reversed Addressing is only exe-
cuted for Register Indirect with Pre-Increment or
Post-Increment Addressing and word sized data writes.
It will not function for any other addressing mode or for
byte sized data and normal addresses are generated
instead. When Bit-Reversed Addressing is active, the
W Address Pointer is always added to the address
modifier (XB) and the offset associated with the Regis-
ter Indirect Addressing mode is ignored. In addition, as
word sized data is a requirement, the LSb of the EA is
ignored (and always clear).
If Bit-Reversed Addressing has already been enabled
by setting the BREN (XBREV<15>) bit, then a write to
the XBREV register should not be immediately followed
by an indirect read operation using the W register that
has been designated as the bit-reversed pointer.
Note:
The modulo corrected effective address is
written back to the register only when
Pre-Modify or Post-Modify Addressing
mode is used to compute the effective
address. When an address offset (e.g.,
[W7+W2]) is used, Modulo Address cor-
rection is performed but the contents of
the register remain unchanged.
Note:
All bit-reversed EA calculations assume
word sized data (LSb of every EA is
always clear). The XB value is scaled
accordingly to generate compatible (byte)
addresses.
Note:
Modulo
Addressing
and
Bit-Reversed
Addressing
should
not
be
enabled
together. In the event that the user attempts
to do so, Bit-Reversed Addressing will
assume priority when active for the X
WAGU and X WAGU Modulo Addressing
will
be
disabled.
However,
Modulo
Addressing will continue to function in the X
RAGU.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MA330011 | 制造商:Microchip Technology Inc 功能描述:dsPIC33 GP 100P to 100P TQFP Plug-In Mod |
| MA330012 | 功能描述:子卡和OEM板 dsPIC33F GP 100P to 84P Plug In Module RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| MA330013 | 功能描述:子卡和OEM板 dsPIC33F Plug In Module RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| MA330014 | 功能描述:子卡和OEM板 dsPIC33 MC RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| MA330015 | 功能描述:子卡和OEM板 dsPIC33 GP RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
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