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| 型號： | AC164335 |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 124/285頁 |
| 文件大?。?/td> | 0K |
| 描述： | MODULE SKT FOR 10X10 PM3 44TQFP |
| 標準包裝： | 1 |
| 模塊/板類型： | TQFP 插座模塊 |
| 適用于相關產(chǎn)品： | MPLAB? PM3 |
| 產(chǎn)品目錄頁面： | 658 (CN2011-ZH PDF) |
| 相關產(chǎn)品： | PIC24FJ64GA004-E/PT-ND - IC PIC MCU FLASH 64K 44-TQFP PIC24FJ48GA004-E/PT-ND - IC PIC MCU FLASH 48K 44-TQFP PIC24FJ32GA004-E/PT-ND - IC PIC MCU FLASH 32K 44-TQFP PIC24FJ16GA004-E/PT-ND - IC PIC MCU FLASH 16K 44-TQFP DSPIC33FJ16MC304-I/ML-ND - IC DSPIC MCU/DSP 16K 44QFN DSPIC33FJ16MC304-E/ML-ND - IC DSPIC MCU/DSP 16K 44QFN DSPIC33FJ64MC204-I/PT-ND - IC DSPIC MCU/DSP 64K 44-TQFP DSPIC33FJ64MC204-E/PT-ND - IC DSPIC MCU/DSP 64K 44-TQFP DSPIC33FJ64MC204T-I/PTTR-ND - IC DSPIC MCU/DSP 64K 44TQFP DSPIC33FJ16MC304T-I/MLTR-ND - IC DSPIC MCU/DSP 16K 44QFN 更多... |
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2006 Microchip Technology Inc.
Preliminary
DS70178C-page 19
dsPIC30F1010/202X
2.0
CPU ARCHITECTURE
OVERVIEW
2.1
Core Overview
The core has a 24-bit instruction word. The Program
Counter (PC) is 23 bits wide with the Least Significant
bit (LSb) always clear (see Section 3.1 “Program
Address Space”), and the Most Significant bit (MSb)
is ignored during normal program execution, except for
certain specialized instructions. Thus, the PC can
address up to 4M instruction words of user program
space. An instruction prefetch mechanism is used to
help maintain throughput. Program loop constructs,
free from loop count management overhead, are sup-
ported using the DO and REPEAT instructions, both of
which are interruptible at any point.
The working register array consists of 16x16-bit regis-
ters, each of which can act as data, address or offset
registers. One working register (W15) operates as a
software Stack Pointer for interrupts and calls.
The data space is 64 Kbytes (32K words) and is split
into two blocks, referred to as X and Y data memory.
Each block has its own independent Address Genera-
tion Unit (AGU). Most instructions operate solely
through the X memory AGU, which provides the
appearance of a single unified data space. The
Multiply-Accumulate (MAC) class of dual source DSP
instructions operate through both the X and Y AGUs,
splitting the data address space into two parts (see
Section 3.2 “Data Address Space”). The X and Y
data space boundary is device-specific and cannot be
altered by the user. Each data word consists of 2 bytes,
and most instructions can address data either as words
or bytes.
There are two methods of accessing data stored in
program memory:
The upper 32 Kbytes of data space memory can be
mapped into the lower half (user space) of program
space at any 16K program word boundary, defined
by the 8-bit Program Space Visibility Page
(PSVPAG) register. This lets any instruction access
program space as if it were data space, with a limita-
tion that the access requires an additional cycle.
Moreover, only the lower 16 bits of each instruction
word can be accessed using this method.
Linear indirect access of 32K word pages within
program space is also possible using any working
register, via table read and write instructions.
Table read and write instructions can be used to
access all 24 bits of an instruction word.
Overhead-free circular buffers (modulo addressing)
are supported in both X and Y address spaces. This is
primarily intended to remove the loop overhead for
DSP algorithms.
The X AGU also supports Bit-Reversed Addressing
mode on destination effective addresses, to greatly
simplify input or output data reordering for radix-2 FFT
algorithms. Refer to Section 4.0 “Address Generator
Units” for details on modulo and Bit-Reversed
Addressing.
The core supports Inherent (no operand), Relative, Lit-
eral, Memory Direct, Register Direct, Register Indirect,
Register Offset and Literal Offset Addressing modes.
Instructions are associated with predefined Addressing
modes, depending upon their functional requirements.
For most instructions, the core is capable of executing
a data (or program data) memory read, a working reg-
ister (data) read, a data memory write and a program
(instruction) memory read per instruction cycle. As a
result, 3-operand instructions are supported, allowing
C = A + B operations to be executed in a single cycle.
A DSP engine has been included to significantly
enhance the core arithmetic capability and throughput.
It features a high-speed 17-bit by 17-bit multiplier, a
40-bit ALU, two 40-bit saturating accumulators and a
40-bit bidirectional barrel shifter. Data in the accumula-
tor or any working register can be shifted up to 15 bits
right or 16 bits left in a single cycle. The DSP instruc-
tions operate seamlessly with all other instructions and
have been designed for optimal real-time performance.
The MAC class of instructions can concurrently fetch
two data operands from memory, while multiplying two
W registers. To enable this concurrent fetching of data
operands, the data space has been split for these
instructions and linear for all others. This has been
achieved in a transparent and flexible manner, by
dedicating certain working registers to each address
space for the MAC class of instructions.
The core does not support a multi-stage instruction
pipeline. However, a single stage instruction prefetch
mechanism is used, which accesses and partially
decodes instructions a cycle ahead of execution, in
order to maximize available execution time. Most
instructions execute in a single cycle, with certain
exceptions.
The core features a vectored exception processing
structure for traps and interrupts, with 62 independent
vectors. The exceptions consist of up to 8 traps (of
which 4 are reserved) and 54 interrupts. Each interrupt
is prioritized based on a user-assigned priority between
1 and 7 (1 being the lowest priority and 7 being the
highest) in conjunction with a predetermined ‘natural
order’. Traps have fixed priorities, ranging from 8 to 15.
Note: This data sheet summarizes features of this group
of dsPIC30F devices and is not intended to be a complete
reference source. For more information on the CPU,
peripherals, register descriptions and general device
functionality, refer to the “dsPIC30F Family Reference
Manual” (DS70046). For more information on the device
instruction set and programming, refer to the “dsPIC30F/
33F Programmer’s Reference Manual” (DS70157).
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