DSPIC30F4011-20E/PT Microchip Technology, DSPIC30F4011-20E/PT Datasheet - Page 22

• Manufacturer Part Number: DSPIC30F4011-20E/PT
• Description: IC DSPIC MCU/DSP 48K 44TQFP
• Manufacturer: Microchip Technology
• Series: dsPIC™ 30Fr

Specifications of DSPIC30F4011-20E/PT

• Program Memory Type: FLASH
• Program Memory Size: 48KB (16K x 24)
• Package / Case: 44-TQFP, 44-VQFP
• Core Processor: dsPIC
• Core Size: 16-Bit
• Speed: 20 MIPS
• Connectivity: CAN, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, Motor Control PWM, QEI, POR, PWM, WDT
• Number Of I /o: 30
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.5 V ~ 5.5 V
• Data Converters: A/D 9x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Data Bus Width: 16 bit
• Processor Series: DSPIC30F
• Core: dsPIC
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 30
• Data Ram Size: 2 KB
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52713-733, 52714-737, 53276-922, EWDSPIC
• Data Rom Size: 1024 B
• Development Tools By Supplier: PG164130, DV164035, DV244005, DV164005, PG164120, ICE4000, DM240002, DM300018, DM330011
• Minimum Operating Temperature: - 40 C
• Package: 44TQFP
• Device Core: dsPIC
• Family Name: dsPIC30
• Maximum Speed: 20 MHz
• Interface Type: CAN/I2C/SPI/UART
• On-chip Adc: 9-chx10-bit
• Number Of Timers: 5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT44PT3 - SOCKET TRAN ICE 44MQFP/TQFPAC30F006 - MODULE SKT FOR DSPIC30F 44TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: DSPIC30F401120EPT

dsPIC30F4011/4012
2.4.1
The 17x17-bit multiplier is capable of signed or
unsigned operation and can multiplex its output using a
scaler to support either 1.31 fractional (Q31) or 32-bit
integer results. Unsigned operands are zero-extended
into the 17th bit of the multiplier input value. Signed
operands are sign-extended into the 17th bit of the mul-
tiplier input value. The output of the 17x17-bit multiplier/
scaler is a 33-bit value, which is sign-extended to
40 bits. Integer data is inherently represented as a
signed two’s complement value, where the MSB is
defined as a sign bit. Generally speaking, the range of
an N-bit two’s complement integer is -2
For a 16-bit integer, the data range is -32768 (0x8000)
to 32767 (0x7FFF), including 0. For a 32-bit integer, the
data range is -2,147,483,648 (0x8000 0000) to
2,147,483,645 (0x7FFF FFFF).
When the multiplier is configured for fractional multipli-
cation, the data is represented as a two’s complement
fraction, where the MSB is defined as a sign bit and the
radix point is implied to lie just after the sign bit
(QX format). The range of an N-bit two’s complement
fraction with this implied radix point is -1.0 to (1-2
For a 16-bit fraction, the Q15 data range is -1.0
(0x8000) to 0.999969482 (0x7FFF), including 0, and
has a precision of 3.01518x10
16x16 multiply operation generates a 1.31 product,
which has a precision of 4.65661x10
The same multiplier is used to support the DSC multiply
instructions, which include integer 16-bit signed,
unsigned and mixed sign multiplies.
The MUL instruction may be directed to use byte or
word-sized operands. Byte operands direct a 16-bit
result, and word operands direct a 32-bit result to the
specified register(s) in the W array.
2.4.2
The data accumulator consists of a 40-bit adder/
subtracter with automatic sign extension logic. It
can select one of two accumulators (A or B) as its
pre-accumulation source and post-accumulation desti-
nation. For the ADD and LAC instructions, the data to be
accumulated or loaded can be optionally scaled via the
barrel shifter, prior to accumulation.
DS70135G-page 22
MULTIPLIER
DATA ACCUMULATORS AND
ADDER/SUBTRACTER
-5
. In Fractional mode, a
-10
.
N-1
to 2
N-1
1-N
– 1.
).
2.4.2.1
The adder/subtracter is a 40-bit adder with an optional
zero input into one side and either true or complement
data into the other input. In the case of addition, the
carry/borrow input is active-high and the other input is
true data (not complemented), whereas in the case of
subtraction, the carry/borrow input is active-low and the
other input is complemented. The adder/subtracter
generates Overflow Status bits, SA/SB and OA/OB,
which are latched and reflected in the STATUS register.
• Overflow from bit 39: this is a catastrophic
• Overflow into guard bits 32 through 39: this is a
The adder has an additional saturation block which
controls accumulator data saturation, if selected. It
uses the result of the adder, the Overflow Status bits
described above, and the SATA/B (CORCON<7:6>)
and ACCSAT (CORCON<4>) mode control bits to
determine when and to what value to saturate.
Six STATUS register bits have been provided to
support saturation and overflow; they are:
1.
2.
3.
4.
5.
6.
The OA and OB bits are modified each time data
passes through the adder/subtracter. When set, they
indicate that the most recent operation has overflowed
into the accumulator guard bits (bits 32 through 39).
Also, the OA and OB bits can optionally generate an
arithmetic
corresponding Overflow Trap Flag Enable bit (OVATE,
OVBTE) in the INTCON1 register (refer to
“Interrupts”) is set. This allows the user to take
immediate action, for example, to correct system gain.
overflow in which the sign of the accumulator is
destroyed.
recoverable overflow. This bit is set whenever all
the guard bits are not identical to each other.
OA: ACCA overflowed into guard bits.
OB: ACCB overflowed into guard bits.
SA: ACCA saturated (bit 31 overflow and
saturation).
or
ACCA overflowed into guard bits and saturated
(bit 39 overflow and saturation).
SB: ACCB saturated (bit 31 overflow and
saturation).
or
ACCB overflowed into guard bits and saturated
(bit 39 overflow and saturation).
OAB: Logical OR of OA and OB.
SAB: Logical OR of SA and SB.
warning
Adder/Subtracter, Overflow and
Saturation
trap
© 2010 Microchip Technology Inc.
when
set
Section 5.0
and
the