DSPIC30F4013-20E/P Microchip Technology Inc., DSPIC30F4013-20E/P Datasheet - Page 46
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DSPIC30F4013-20E/P
Manufacturer Part Number
DSPIC30F4013-20E/P
Description
16 BIT MCU/DSP 40LD 20MIPS 48 KB FLASH
Manufacturer
Microchip Technology Inc.
Type
DSPr
Datasheet
1.DSPIC30F4013-20EP.pdf
(204 pages)
Specifications of DSPIC30F4013-20E/P
A/d Inputs
13-Channels, 12-Bit
Comparators
4
Cpu Speed
30 MIPS
Eeprom Memory
1K Bytes
Input Output
30
Interface
CAN, I2C/SPI/UART, USART
Ios
30
Memory Type
Flash
Number Of Bits
16
Package Type
40-pin PDIP
Programmable Memory
48K Bytes
Ram Size
2K Bytes
Timers
5-16-bit, 2-32-bit
Voltage, Range
2.5-5.5
Lead Free Status / Rohs Status
RoHS Compliant part
Electrostatic Device
Available stocks
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Company:
Part Number:
DSPIC30F4013-20E/PT
Manufacturer:
Microchip Technology
Quantity:
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dsPIC30F2011/2012/3012/3013
4.2.3
Modulo Addressing can be applied to the Effective
Address (EA) calculation associated with any W regis-
ter. It is important to realize that the address bound-
aries check for addresses less than, or greater than the
upper (for incrementing buffers), and lower (for decre-
menting buffers) boundary addresses (not just equal
to). Address changes may, therefore, jump beyond
boundaries and still be adjusted correctly.
4.3
Bit-Reversed Addressing 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.
4.3.1
Bit-Reversed Addressing is enabled when:
1.
2.
3.
DS70139D-page 44
Note:
BWM (W register selection) in the MODCON
register is any value other than ‘15’ (the stack
cannot
Addressing) and
the BREN bit is set in the XBREV register and
the addressing mode used is Register Indirect
with Pre-Increment or Post-Increment.
Bit-Reversed Addressing
MODULO ADDRESSING
APPLICABILITY
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 correction is per-
formed, but the contents of the register
remain unchanged.
BIT-REVERSED ADDRESSING
IMPLEMENTATION
be
accessed
using
Bit-Reversed
If the length of a bit-reversed buffer is M = 2
then 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
does not function for any other addressing mode or for
byte-sized data. 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:
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.
Modulo Addressing and Bit-Reversed
Addressing
together. In the event that the user attempts
to do this,
assumes priority when active for the X
WAGU, and X WAGU Modulo Addressing
is disabled. However, Modulo Addressing
continues to function in the X RAGU.
© 2006 Microchip Technology Inc.
should
Bit-Reversed
not
be
Addressing
enabled
N
bytes,
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