參數(shù)資料
型號(hào)： DSPIC30F3013-30I/SP
廠商： Microchip Technology
文件頁(yè)數(shù)： 97/161頁(yè)
文件大?。?/td> 0K
描述： IC DSPIC MCU/DSP 24K 28DIP
產(chǎn)品培訓(xùn)模塊： 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： 15
系列： dsPIC™ 30F
核心處理器： dsPIC
芯體尺寸： 16-位
速度： 30 MIP
連通性： I²C，SPI，UART/USART
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 20
程序存儲(chǔ)器容量： 24KB（8K x 24）
程序存儲(chǔ)器類型： 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 10x12b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 28-DIP（0.300"，7.62mm）
包裝： 管件
產(chǎn)品目錄頁(yè)面： 651 (CN2011-ZH PDF)
配用： DV164005-ND - KIT ICD2 SIMPLE SUIT W/USB CABLE
其它名稱： DSPIC30F301330ISP
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dsPIC30F2011/2012/3012/3013
DS70139G-page 26
2010 Microchip Technology Inc.
The SA and SB bits are modified each time data
passes through the adder/subtracter but can only be
cleared by the user. When set, they indicate that the
accumulator has overflowed its maximum range (bit 31
for 32-bit saturation or bit 39 for 40-bit saturation) and
will be saturated if saturation is enabled. When satura-
tion is not enabled, SA and SB default to bit 39 overflow
and thus indicate that a catastrophic overflow has
occurred. If the COVTE bit in the INTCON1 register is
set, SA and SB bits generate an arithmetic warning trap
when saturation is disabled.
The overflow and saturation Status bits can optionally
be viewed in the STATUS register (SR) as the logical
OR of OA and OB (in bit OAB) and the logical OR of SA
and SB (in bit SAB). This allows programmers to check
one bit in the STATUS register to determine if either
accumulator has overflowed, or one bit to determine if
either accumulator has saturated. This would be useful
for complex number arithmetic which typically uses
both the accumulators.
The device supports three saturation and overflow
modes:
1.
Bit 39 Overflow and Saturation:
When bit 39 overflow and saturation occurs, the
saturation logic loads the maximally positive 9.31
(0x7FFFFFFFFF) or maximally negative 9.31
value
(0x8000000000)
into
the
target
accumulator. The SA or SB bit is set and remains
set until cleared by the user. This is referred to as
‘super saturation’ and provides protection against
erroneous
data
or
unexpected
algorithm
problems (e.g., gain calculations).
2.
Bit 31 Overflow and Saturation:
When bit 31 overflow and saturation occurs, the
saturation logic then loads the maximally posi-
tive 1.31 value (0x007FFFFFFF) or maximally
negative 1.31 value (0x0080000000) into the
target accumulator. The SA or SB bit is set and
remains set until cleared by the user. When this
Saturation mode is in effect, the guard bits are
not used, so the OA, OB or OAB bits are never
set.
3.
Bit 39 Catastrophic Overflow:
The bit 39 overflow Status bit from the adder is
used to set the SA or SB bit which remains set
until cleared by the user. No saturation operation
is performed and the accumulator is allowed to
overflow (destroying its sign). If the COVTE bit in
the INTCON1 register is set, a catastrophic
overflow can initiate a trap exception.
2.4.2.2
Accumulator ‘Write-Back’
The MAC class of instructions (with the exception of
MPY,
MPY.N,
ED
and EDAC) can optionally write a
rounded version of the high word (bits 31 through 16)
of the accumulator that is not targeted by the instruction
into data space memory. The write is performed across
the X bus into combined X and Y address space. The
following addressing modes are supported:
1.
W13, Register Direct:
The
rounded
contents
of
the
non-target
accumulator are written into W13 as a 1.15
fraction.
2.
[W13]+
=
2,
Register
Indirect
with
Post-Increment:
The
rounded
contents
of
the
non-target
accumulator are written into the address pointed
to by W13 as a 1.15 fraction. W13 is then
incremented by 2 (for a word write).
2.4.2.3
Round Logic
The round logic is a combinational block which
performs a conventional (biased) or convergent
(unbiased) round function during an accumulator write
(store). The Round mode is determined by the state of
the RND bit in the CORCON register. It generates a
16-bit, 1.15 data value, which is passed to the data
space write saturation logic. If rounding is not indicated
by the instruction, a truncated 1.15 data value is stored
and the least significant word (lsw) is simply discarded.
Conventional rounding takes bit 15 of the accumulator,
zero-extends it and adds it to the ACCxH word (bits 16
through 31 of the accumulator). If the ACCxL word
(bits 0 through 15 of the accumulator) is between
0x8000 and 0xFFFF (0x8000 included), ACCxH is
incremented. If ACCxL is between 0x0000 and 0x7FFF,
ACCxH is left unchanged. A consequence of this
algorithm is that over a succession of random rounding
operations, the value tends to be biased slightly
positive.
Convergent (or unbiased) rounding operates in the
same manner as conventional rounding, except when
ACCxL equals 0x8000. If this is the case, the LSb
(bit 16 of the accumulator) of ACCxH is examined. If it
is ‘1’, ACCxH is incremented. If it is ‘0’, ACCxH is not
modified. Assuming that bit 16 is effectively random in
nature, this scheme will remove any rounding bias that
may accumulate.
The SAC and SAC.R instructions store either a
truncated (SAC) or rounded (SAC.R) version of the
contents of the target accumulator to data memory via
the
X
bus
(subject
to
data
saturation,
see
Note that for the MAC class of instructions, the
accumulator write-back operation functions in the
same manner, addressing combined MCU (X and Y)
data space though the X bus. For this class of
instructions, the data is always subject to rounding.
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