參數(shù)資料
型號(hào)： DSPIC30F4012-20I/SO
廠商： Microchip Technology
文件頁(yè)數(shù)： 135/238頁(yè)
文件大?。?/td> 0K
描述： IC DSPIC MCU/DSP 48K 28SOIC
產(chǎn)品培訓(xùn)模塊： dsPIC30F Quadrature Encoder Interface
Serial Communications using dsPIC30F CAN
Serial Communications using dsPIC30F I2C
Serial Communications using dsPIC30F SPI
Serial Communications using dsPIC30F UART
dsPIC30F 12 bit ADC - Part 2
dsPIC30F Addressing Modes - Part 1
dsPIC30F Architecture - Part 1
dsPIC30F DSP Engine & ALU
dsPIC30F Interrupts
dsPIC30F Motor Control PWM
dsPIC Timers
Asynchronous Stimulus
dsPIC30F Addressing Modes - Part 2
dsPIC30F Architecture - Part 2
dsPIC30F 12-bit ADC Part 1
標(biāo)準(zhǔn)包裝： 27
系列： dsPIC™ 30F
核心處理器： dsPIC
芯體尺寸： 16-位
速度： 20 MIPS
連通性： CAN，I²C，SPI，UART/USART
外圍設(shè)備： 高級(jí)欠壓探測(cè)/復(fù)位，電機(jī)控制 PWM，QEI，POR，PWM，WDT
輸入/輸出數(shù)： 20
程序存儲(chǔ)器容量： 48KB（16K x 24）
程序存儲(chǔ)器類(lèi)型： 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量： 2K x 8
電壓 - 電源 (Vcc/Vdd)： 2.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 6x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
包裝： 管件
配用： XLT28SO-1-ND - SOCKET TRANSITION 28SOIC 300MIL
其它名稱(chēng)： DSPIC30F401220ISO
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dsPIC30F4011/4012
DS70135G-page 22
2010 Microchip Technology Inc.
2.4.1
MULTIPLIER
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 -2N-1 to 2N-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
2,147,483,645 (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 (1-21-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, a
16x16 multiply operation generates a 1.31 product,
which has a precision of 4.65661x10-10.
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
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 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.
2.4.2.1
Adder/Subtracter, Overflow and
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), 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 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 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.
OA: ACCA overflowed into guard bits.
2.
OB: ACCB overflowed into guard bits.
3.
SA: ACCA saturated (bit 31 overflow and
saturation).
or
ACCA overflowed into guard bits and saturated
(bit 39 overflow and saturation).
4.
SB: ACCB saturated (bit 31 overflow and
saturation).
or
ACCB overflowed into guard bits and saturated
(bit 39 overflow and saturation).
5.
OAB: Logical OR of OA and OB.
6.
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).
Also, the OA and OB bits can optionally generate an
arithmetic
warning
trap
when
set
and
the
corresponding Overflow Trap Flag Enable bit (OVATE,
OVBTE) in the INTCON1 register (refer to Section 5.0
“Interrupts”) is set. This allows the user to take
immediate action, for example, to correct system gain.
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