参数资料
| 型号： | MA330029 |
| 厂商： | Microchip Technology |
| 文件页数： | 33/322页 |
| 文件大小： | 0K |
| 描述： | MODULE PLUG-IN DSPIC33FJ16GP102 |
| 标准包装： | 1 |
| 系列： | * |
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dsPIC33FJ16GP101/102 AND dsPIC33FJ16MC101/102
3.6.1
MULTIPLIER
3.6.2.1
Adder/Subtracter, Overflow and
The 17-bit x 17-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
multiplier input value. The output of the 17-bit x 17-bit
multiplier/scaler is a 33-bit value that is sign-extended
to 40 bits. Integer data is inherently represented as a
signed 2’s complement value, where the Most Signifi-
cant bit (MSb) is defined as a sign bit. The range of an
N-bit 2’s complement integer is -2 N-1 to 2 N-1 – 1.
? 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 2,147,483,647
(0x7FFF FFFF).
When the multiplier is configured for fractional
multiplication, the data is represented as a 2’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 2’s
complement fraction with this implied radix point is -1.0
to (1 – 2 1-N ). 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 -5 . In Fractional
mode, the 16 x 16 multiply operation generates a 1.31
product that has a precision of 4.65661 x 10 -10 .
Saturation
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).
? 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 in which the sign of the accumulator is
destroyed.
? Overflow into guard bits 32 through 39: this is a
recoverable overflow. This bit is set whenever all
the guard bits are not identical to each other.
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 previously and the SAT<A:B>
(CORCON<7:6>) and ACCSAT (CORCON<4>) mode
control bits to determine when and to what value, to
saturate.
Six STATUS register bits support saturation and
overflow:
The same multiplier is used to support the MCU
multiply instructions, which include integer 16-bit
signed, unsigned and mixed sign multiply operations.
The MUL instruction can be directed to use byte- or
word-sized operands. Byte operands will direct a 16-bit
result, and word operands will direct a 32-bit result to
the specified register(s) in the W array.
? OA:
? OB:
? SA:
or
ACCA overflowed into guard bits
ACCB overflowed into guard bits
ACCA saturated (bit 31 overflow and
saturation)
ACCA overflowed into guard bits and
saturated (bit 39 overflow and saturation)
3.6.2 DATA ACCUMULATORS AND
ADDER/SUBTRACTER
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
destination. For the ADD and LAC instructions, the data
to be accumulated or loaded can be optionally scaled
using the barrel shifter prior to accumulation.
? 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
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).
The OA and OB bits can also optionally generate an
arithmetic warning trap when OA and OB are set and
the corresponding Overflow Trap Flag Enable bits
(OVATE, OVBTE) in the INTCON1 register are set
(refer to Section 7.0 “Interrupt Controller” ). This
allows the user application to take immediate action; for
example, to correct system gain.
? 2011 Microchip Technology Inc.
Preliminary
DS70652C-page 33
相关PDF资料 |
PDF描述 |
|---|---|
| MA9D00-42 | DSUB CONN W/DIAGNOSTIC PORT STRT |
| MAI | ADAPTER PUSH-ON/M-SWTCH ATTCHMNT |
| MAV0020RP | VARISTOR ARRY 2ELEMENT 120V 0405 |
| MAX11503EVKIT+ | KIT EVAL FOR MAX11503 |
| MAX11504EVKIT+ | KIT EVAL FOR MAX11504 |
相关代理商/技术参数 |
参数描述 |
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| MA330030 | 功能描述:子卡和OEM板 dsPIC33EP256GP506 PIM RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| MA330031 | 功能描述:子卡和OEM板 32Bit MCU 512KBFlash 128KB RAM, 80 MHz RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| MA330031-2 | 功能描述:子卡和OEM板 32Bit MCU 512KBFlash 128KB RAM, 80 MHz RoHS:否 制造商:BeagleBoard by CircuitCo 产品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit |
| MA330032 | 制造商:Microchip Technology Inc 功能描述:DSPIC33FJ32MC104 MOTOR CONTROL PIM - Boxed Product (Development Kits) 制造商:Microchip Technology Inc 功能描述:MOD PIM DSPIC33FJ32MC104 制造商:Microchip Technology Inc 功能描述:DSPIC33FJ32MC104, MOTOR CONTROL, PIM 制造商:Microchip Technology Inc 功能描述:dsPIC33FJ32MC104 Motor Ctrl 制造商:Microchip Technology Inc 功能描述:PLUG-IN-MODULE, DSPICDEM MOTOR CONTROL; Silicon Manufacturer:Microchip; Core Architecture:dsPIC; Core Sub-Architecture:dsPIC33; Silicon Core Number:dsPIC33F; Silicon Family Name:dsPIC33FJxxMCxxx |
| MA330033 | 制造商:Microchip Technology Inc 功能描述:DSPIC33EP512GM706 SINGLE MOTOR INTERNAL OP-1AMP PIM - Boxed Product (Development Kits) 制造商:Microchip Technology Inc 功能描述:MOD PIM DSPIC33EP512GM706 INT 制造商:Microchip Technology Inc 功能描述:dsPIC33EP512GM706 Single Motor Internal Op-Amp PIM 制造商:Microchip Technology Inc 功能描述:Single Motor Internal Op-Amp PIM w/ dsPIC33EP512GM706 制造商:Microchip Technology Inc 功能描述:dsPIC33EP512GM706 Single Motor Internal Op-Amp PIM, Plug-in Modules |
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