DSPIC33FJ128MC510-I/PT Microchip Technology, DSPIC33FJ128MC510-I/PT Datasheet - Page 15

• Manufacturer Part Number: DSPIC33FJ128MC510-I/PT
• Description: IC DSPIC MCU/DSP 128K 100TQFP
• Manufacturer: Microchip Technology
• Series: dsPIC™ 33Fr

Specifications of DSPIC33FJ128MC510-I/PT

• Core Processor: dsPIC
• Core Size: 16-Bit
• Speed: 40 MIPs
• Connectivity: CAN, I²C, IrDA, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, Motor Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 85
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 3.6 V
• Data Converters: A/D 24x10b/12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 100-TFQFP
• Core Frequency: 40MHz
• Core Supply Voltage: 2.75V
• Embedded Interface Type: CAN, I2C, SPI, UART
• No. Of I/o's: 85
• Flash Memory Size: 128KB
• Supply Voltage Range: 3V To 3.6V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 876-1001 - DSPIC33 BREAKOUT BOARDAC164333 - MODULE SKT FOR PM3 100QFPMA330013 - MODULE PLUG-IN DSPIC33 100TQFPDV164033 - KIT START EXPLORER 16 MPLAB ICD2DM240001 - BOARD DEMO PIC24/DSPIC33/PIC32DV164005 - KIT ICD2 SIMPLE SUIT W/USB CABLE
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

3.4
The DSP engine consists of a high-speed, single-
cycle, 17-bit x 17-bit multiplier, a barrel shifter and a
40-bit adder/subtractor with two target accumulators,
round and saturation logic, all of which enable efficient
execution
algorithms. The 17-bit x 17-bit multiplier is also utilized
for MCU-based multiply instructions.
The DSP engine also has the capability to perform
inherent accumulator-to-accumulator operations, which
require no additional data. These instructions are ADD,
SUB and NEG. This feature greatly simplifies basic
arithmetic operations on 32-bit or 40-bit data.
A block diagram of the DSP engine is shown in
Figure 3-4.
3.4.1
The 17 x 17-bit multiplier is capable of signed or
unsigned operation. It can suitably scale its output to
support either 1.31 fractional (Q31) or 32-bit integer
results, thereby diminishing the need to manually
post-process multiplication results for fractional data.
3.4.2
The data accumulators have a 40-bit adder/subtractor
with automatic sign extension logic. It can select one of
two accumulators (A or B) as its pre-accumulation
source and post-accumulation destination. For the ADD
and LAC instructions, the data to be accumulated or
loaded can be optionally scaled via the barrel shifter
prior to accumulation.
The adder/subtractor generates overflow status bits,
SA/SB and OA/OB, which are latched and reflected in
the Status register and can also optionally generate an
arithmetic error trap:
• Overflow from bit 39. This is a catastrophic
• Overflow into guard bits 32 through 39. This is a
© 2005 Microchip Technology Inc.
overflow in which the sign of the accumulator is
destroyed.
recoverable overflow. This bit (OA/OB) is set
whenever all the guard bits are not identical to
each other.
DSP Engine
17 x 17-BIT MULTIPLIER
40-BIT ACCUMULATORS
of
computationally
intensive
DSP
Preliminary
3.4.3
The adder has an additional saturation block that
controls accumulator data saturation, if selected. It
uses the result of the adder, the overflow status bits
described above and the user-configured control bits to
determine when to saturate and to what value to
saturate (a 40-bit or a 32-bit value).
In addition to adder/subtractor saturation, writes to data
space can also be saturated, but without affecting the
contents of the source accumulator.
The rounding logic performs a conventional (biased) or
convergent (unbiased) data rounding function during
an accumulator write (store). The Round mode is user-
selectable. Rounding generates a 16-bit, 1.15 data
value, which is passed to the data space write
saturation logic. Data space write saturation ensures
that the data in the accumulator is written back
accurately even when rounding is performed. If
rounding is not indicated by the instruction, a truncated
1.15 data value is stored and the least significant word
is simply discarded.
SATURATION AND OVERFLOW
dsPIC33F
DS70155C-page 13