DSPIC33FJ32MC204-I/PT Microchip Technology Inc., DSPIC33FJ32MC204-I/PT Datasheet - Page 22

• Manufacturer Part Number: DSPIC33FJ32MC204-I/PT
• Description: 16-BIT DSC, 44LD, 32KB FLASH, MOTOR, 40 MIPS, NANOWATT
• Manufacturer: Microchip Technology Inc.
• Type: DSPr

Specifications of DSPIC33FJ32MC204-I/PT

• A/d Inputs: 9-Channels, 10-Bit
• Cpu Speed: 40 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 35
• Interface: I2C, SPI, UART/USART
• Ios: 35
• Memory Type: Flash
• Number Of Bits: 16
• Package Type: 44-pin TQFP
• Programmable Memory: 32K Bytes
• Ram Size: 2K Bytes
• Timers: 3-16-bit, 1-32-bit
• Voltage, Range: 3-3.6 V
• Dc: 08+
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

2.5
The
dsPIC33FJ16MC304 ALU is 16 bits wide and is capa-
ble of addition, subtraction, bit shifts and logic opera-
tions.
operations are 2’s complement in nature. Depending
on the operation, the ALU can affect the values of the
Carry (C), Zero (Z), Negative (N), Overflow (OV) and
Digit Carry (DC) Status bits in the SR register. The C
and DC Status bits operate as Borrow and Digit Borrow
bits, respectively, for subtraction operations.
The ALU can perform 8-bit or 16-bit operations,
depending on the mode of the instruction that is used.
Data for the ALU operation can come from the W reg-
ister array or data memory, depending on the address-
ing mode of the instruction. Likewise, output data from
the ALU can be written to the W register array or a data
memory location.
Refer to the “dsPIC30F/33F Programmer’s Reference
Manual” (DS70157) for information on the SR bits
affected by each instruction.
The
dsPIC33FJ16MC304 CPU incorporates hardware sup-
port for both multiplication and division. This includes a
dedicated hardware multiplier and support hardware
for 16-bit-divisor division.
2.5.1
Using the high-speed 17-bit x 17-bit multiplier of the
DSP engine, the ALU supports unsigned, signed or
mixed-sign operation in several MCU multiplication
modes:
• 16-bit x 16-bit signed
• 16-bit x 16-bit unsigned
• 16-bit signed x 5-bit (literal) unsigned
• 16-bit unsigned x 16-bit unsigned
• 16-bit unsigned x 5-bit (literal) unsigned
• 16-bit unsigned x 16-bit signed
• 8-bit unsigned x 8-bit unsigned
DS70283B-page 20
Unless
Arithmetic Logic Unit (ALU)
MULTIPLIER
dsPIC33FJ32MC202/204
dsPIC33FJ32MC202/204
otherwise
mentioned,
arithmetic
and
and
Preliminary
2.5.2
The divide block supports 32-bit/16-bit and 16-bit/16-bit
signed and unsigned integer divide operations with the
following data sizes:
1.
2.
3.
4.
The quotient for all divide instructions ends up in W0
and the remainder in W1. 16-bit signed and unsigned
DIV instructions can specify any W register for both the
16-bit divisor (Wn) and any W register (aligned) pair
(W(m + 1):Wm) for the 32-bit dividend. The divide algo-
rithm takes one cycle per bit of divisor, so both 32-bit/
16-bit and 16-bit/16-bit instructions take the same num-
ber of cycles to execute.
2.6
The DSP engine consists of a high-speed 17-bit x
17-bit multiplier, a barrel shifter and a 40-bit adder/
subtracter (with two target accumulators, round and
saturation logic).
The
dsPIC33FJ16MC304 is a single-cycle instruction flow
architecture; therefore, concurrent operation of the
DSP engine with MCU instruction flow is not possible.
However, some MCU ALU and DSP engine resources
can be used concurrently by the same instruction (e.g.,
ED, EDAC).
The DSP engine can also perform inherent accumula-
tor-to-accumulator operations that require no additional
data. These instructions are ADD, SUB and NEG.
The DSP engine has options selected through bits in
the CPU Core Control register (CORCON), as listed
below:
• Fractional or integer DSP multiply (IF)
• Signed or unsigned DSP multiply (US)
• Conventional or convergent rounding (RND)
• Automatic saturation on/off for ACCA (SATA)
• Automatic saturation on/off for ACCB (SATB)
• Automatic saturation on/off for writes to data
• Accumulator Saturation mode selection (ACCSAT)
A block diagram of the DSP engine is shown in
Figure 2-3.
memory (SATDW)
32-bit signed/16-bit signed divide
32-bit unsigned/16-bit unsigned divide
16-bit signed/16-bit signed divide
16-bit unsigned/16-bit unsigned divide
DSP Engine
DIVIDER
dsPIC33FJ32MC202/204
© 2007 Microchip Technology Inc.
and