參數(shù)資料
型號(hào)： MA330011
廠商： Microchip Technology
文件頁(yè)數(shù)： 175/199頁(yè)
文件大?。?/td> 0K
描述： MODULE DSPIC33 100P TO 100QFP
標(biāo)準(zhǔn)包裝： 1
附件類型： 插拔式模塊（PIM）- dsPIC33FJ256GP710
適用于相關(guān)產(chǎn)品： Explorer 16（DM240001 或 DM240002）
產(chǎn)品目錄頁(yè)面： 658 (CN2011-ZH PDF)
相關(guān)產(chǎn)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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2007 Microchip Technology Inc.
Preliminary
DS70165E-page 75
dsPIC33F
3.6.3
READING DATA FROM PROGRAM
MEMORY USING PROGRAM
SPACE VISIBILITY
The upper 32 Kbytes of data space may optionally be
mapped into any 16K word page of the program space.
This option provides transparent access of stored con-
stant data from the data space without the need to use
special instructions (i.e., TBLRDL/H).
Program space access through the data space occurs
if the Most Significant bit of the data space EA is ‘1’ and
program space visibility is enabled by setting the PSV
bit in the Core Control register (CORCON<2>). The
location of the program memory space to be mapped
into the data space is determined by the Program
Space Visibility Page register (PSVPAG). This 8-bit
register defines any one of 256 possible pages of
16K words in program space. In effect, PSVPAG func-
tions as the upper 8 bits of the program memory
address, with the 15 bits of the EA functioning as the
lower bits. Note that by incrementing the PC by 2 for
each program memory word, the lower 15 bits of data
space addresses directly map to the lower 15 bits in the
corresponding program space addresses.
Data reads to this area add an additional cycle to the
instruction being executed, since two program memory
fetches are required.
Although each data space address, 8000h and higher,
maps directly into a corresponding program memory
address (see Figure 3-11), only the lower 16 bits of the
24-bit program word are used to contain the data. The
upper 8 bits of any program space location used as
data should be programmed with ‘1111
1111
’ or
‘0000 0000’ to force a NOP. This prevents possible
issues should the area of code ever be accidentally
executed.
For operations that use PSV and are executed outside
a REPEAT loop, the MOV
and
MOV.D
instructions
require one instruction cycle in addition to the specified
execution time. All other instructions require two
instruction cycles in addition to the specified execution
time.
For operations that use PSV, which are executed inside
a REPEAT loop, there will be some instances that
require two instruction cycles in addition to the
specified execution time of the instruction:
Execution in the first iteration
Execution in the last iteration
Execution prior to exiting the loop due to an
interrupt
Execution upon re-entering the loop after an
interrupt is serviced
Any other iteration of the REPEAT loop will allow the
instruction accessing data, using PSV, to execute in a
single cycle.
FIGURE 3-11:
PROGRAM SPACE VISIBILITY OPERATION
Note:
PSV access is temporarily disabled during
table reads/writes.
23
15
0
PSVPAG
Data Space
Program Space
0x0000
0x8000
0xFFFF
02
0x000000
0x800000
0x010000
0x018000
When CORCON<2> = 1 and EA<15> = 1:
The data in the page
designated by
PSVPAG is mapped
into the upper half of
the data memory
space...
Data EA<14:0>
...while the lower 15 bits
of the EA specify an
exact address within
the PSV area. This
corresponds exactly to
the same lower 15 bits
of the actual program
space address.
PSV Area
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)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 產(chǎn)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 產(chǎn)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 產(chǎn)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 產(chǎn)品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
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