DSPIC33FJ16GS504-I/PT Microchip Technology, DSPIC33FJ16GS504-I/PT Datasheet - Page 75

IC DSPIC MCU/DSP 16K 44-TQFP

DSPIC33FJ16GS504-I/PT

Manufacturer Part Number
DSPIC33FJ16GS504-I/PT
Description
IC DSPIC MCU/DSP 16K 44-TQFP
Manufacturer
Microchip Technology
Series
dsPIC™ 33Fr

Specifications of DSPIC33FJ16GS504-I/PT

Program Memory Type
FLASH
Program Memory Size
16KB (16K x 8)
Package / Case
44-TQFP, 44-VQFP
Core Processor
dsPIC
Core Size
16-Bit
Speed
40 MIPs
Connectivity
I²C, IrDA, LIN, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
35
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 12x10b, D/A 1x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Product
DSCs
Data Bus Width
16 bit
Processor Series
DSPIC33F
Core
dsPIC
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
35
Data Ram Size
2 KB
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
52713-733, 52714-737, 53276-922, EWDSPIC
Development Tools By Supplier
PG164130, DV164035, DV244005, DV164005, PG164120
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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4.4
Modulo Addressing mode is a method used to provide
an automated means to support circular data buffers
using hardware. The objective is to remove the need
for software to perform data address boundary checks
when executing tightly looped code, as is typical in
many DSP algorithms.
Modulo Addressing can operate in either data or program
space (since the data pointer mechanism is essentially
the same for both). One circular buffer can be supported
in each of the X (which also provides the pointers into
program space) and Y data spaces. Modulo Addressing
can operate on any W register pointer. However, it is not
advisable to use W14 or W15 for Modulo Addressing
since these two registers are used as the Stack Frame
Pointer and Stack Pointer, respectively.
In general, any particular circular buffer can be
configured to operate in only one direction as there are
certain restrictions on the buffer start address (for
incrementing
decrementing buffers), based upon the direction of the
buffer.
The only exception to the usage restrictions is for
buffers that have a power-of-two length. As these
buffers satisfy the start and end address criteria, they
can operate in a bidirectional mode (that is, address
boundary checks are performed on both the lower and
upper address boundaries).
4.4.1
The Modulo Addressing scheme requires that a
starting and ending address be specified and loaded
into the 16-bit Modulo Buffer Address registers:
XMODSRT, XMODEND, YMODSRT and YMODEND
(see Table 4-1).
FIGURE 4-7:
© 2009 Microchip Technology Inc.
Address
0x1100
0x1163
Byte
Modulo Addressing
START AND END ADDRESS
Start Addr = 0x1100
End Addr = 0x1163
Length = 0x0032 words
buffers),
dsPIC33FJ06GS101/X02 and dsPIC33FJ16GSX02/X04
MODULO ADDRESSING OPERATION EXAMPLE
or
end
address
MOV
MOV
MOV
MOV
MOV
MOV
MOV
MOV
DO
MOV
AGAIN: INC W0, W0
Preliminary
(for
#0x1100, W0
W0, XMODSRT
#0x1163, W0
W0, MODEND
#0x8001, W0
W0, MODCON
#0x0000, W0
#0x1110, W1
AGAIN, #0x31
W0, [W1++]
The length of a circular buffer is not directly specified. It
is
corresponding start and end addresses. The maximum
possible length of the circular buffer is 32K words
(64 Kbytes).
4.4.2
The Modulo and Bit-Reversed Addressing Control
register, MODCON<15:0>, contains enable flags as
well as a W register field to specify the W Address
registers. The XWM and YWM fields select the
registers that will operate with Modulo Addressing:
• If XWM = 15, X RAGU and X WAGU Modulo
• If YWM = 15, Y AGU Modulo Addressing is
The X Address Space Pointer W register (XWM), to
which Modulo Addressing is to be applied, is stored in
MODCON<3:0> (see Table 4-1). Modulo Addressing is
enabled for X data space when XWM is set to any value
other than ‘15’ and the XMODEN bit is set at
MODCON<15>.
The Y Address Space Pointer W register (YWM) to
which Modulo Addressing is to be applied is stored in
MODCON<7:4>. Modulo Addressing is enabled for Y
data space when YWM is set to any value other than
‘15’ and the YMODEN bit is set at MODCON<14>.
Note:
Addressing is disabled.
disabled.
determined by the difference
;set modulo start address
;set modulo end address
;enable W1, X AGU for modulo
;W0 holds buffer fill value
;point W1 to buffer
;fill the 50 buffer locations
;fill the next location
;increment the fill value
Y
calculations assume word-sized data (LSb
of every EA is always clear).
W ADDRESS REGISTER
SELECTION
space
Modulo
Addressing
DS70318D-page 73
between
EA
the

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