參數(shù)資料
型號(hào)： ADSP-BF516KSWZ-4F4
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 67/68頁(yè)
文件大?。?/td> 0K
描述： IC DSP 16/32B 400MHZ 176LQFP
標(biāo)準(zhǔn)包裝： 40
系列： Blackfin®
類(lèi)型： 定點(diǎn)
接口： 以太網(wǎng)，I²C，PPI，RSI，SPI，SPORT，UART/USART
時(shí)鐘速率： 400MHz
非易失內(nèi)存： 閃存（4Mb）
芯片上RAM： 116kB
電壓 - 輸入/輸出： 1.8V，2.5V，3.3V
電壓 - 核心： 1.30V
工作溫度： 0°C ~ 70°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 176-LQFP 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 176-LQFP-EP（24x24）
包裝： 托盤(pán)
Rev. B
|
Page 8 of 68
|
January 2011
ADSP-BF512/BF512F, BF514/BF514F, BF516/BF516F, BF518/BF518F
The stopwatch function counts down from a programmed
value, with one-second resolution. When the stopwatch is
enabled and the counter underflows, an interrupt is generated.
Like the other peripherals, the RTC can wake up the processor
from sleep mode upon generation of any RTC wakeup event.
Additionally, an RTC wakeup event can wake up the processor
from deep sleep mode or cause a transition from the hibernate
state.
Connect RTC signals RTXI and RTXO with external compo-
nents as shown in Figure 3.
Watchdog Timer
The ADSP-BF51x processors include a 32-bit timer that can be
used to implement a software watchdog function. A software
watchdog can improve system availability by forcing the proces-
sor to a known state through generation of a hardware reset,
nonmaskable interrupt (NMI), or general-purpose interrupt, if
the timer expires before being reset by software. The program-
mer initializes the count value of the timer, enables the
appropriate interrupt, then enables the timer. Thereafter, the
software must reload the counter before it counts to zero from
the programmed value. This protects the system from remain-
ing in an unknown state where software, which would normally
reset the timer, has stopped running due to an external noise
condition or software error.
If configured to generate a hardware reset, the watchdog timer
resets both the core and the processor peripherals. After a reset,
software can determine if the watchdog was the source of the
hardware reset by interrogating a status bit in the watchdog
timer control register.
The timer is clocked by the system clock (SCLK) at a maximum
frequency of fSCLK.
Timers
There are nine general-purpose programmable timer units in
the ADSP-BF51x processors. Eight timers have an external sig-
nal that can be configured either as a pulse width modulator
(PWM) or timer output, as an input to clock the timer, or as a
mechanism for measuring pulse widths and periods of external
events. These timers can be synchronized to an external clock
input to the several other associated PF signals, an external
clock input to the PPI_CLK input signal, or to the internal
SCLK.
The timer units can be used in conjunction with the two UARTs
to measure the width of the pulses in the data stream to provide
a software auto-baud detect function for the respective serial
channels.
The timers can generate interrupts to the processor core provid-
ing periodic events for synchronization, either to the system
clock or to a count of external signals.
In addition to the eight general-purpose programmable timers,
a ninth timer is also provided. This extra timer is clocked by the
internal processor clock and is typically used as a system tick
clock for generation of operating system periodic interrupts.
3-Phase PWM
The processors integrate a flexible and programmable 3-phase
PWM waveform generator that can be programmed to generate
the required switching patterns to drive a 3-phase voltage
source inverter for ac induction (ACIM) or permanent magnet
synchronous (PMSM) motor control. In addition, the PWM
block contains special functions that considerably simplify the
generation of the required PWM switching patterns for control
of the electronically commutated motor (ECM) or brushless dc
motor (BDCM). Software can enable a special mode for
switched reluctance motors (SRM).
Features of the 3-phase PWM generation unit are:
16-bit center-based PWM generation unit
Programmable PWM pulse width
Single/double update modes
Programmable dead time and switching frequency
Twos-complement implementation which permits smooth
transition to full ON and full OFF states
Possibility to synchronize the PWM generation to an exter-
nal synchronization
Special provisions for BDCM operation (crossover and
output enable functions)
Wide variety of special switched reluctance (SR) operating
modes
Output polarity and clock gating control
Dedicated asynchronous PWM shutdown signal
General-Purpose (GP) Counter
A 32-bit GP counter is provided that can sense 2-bit quadrature
or binary codes as typically emitted by industrial drives or man-
ual thumb wheels. The counter can also operate in general-
purpose up/down count modes. Then, count direction is either
controlled by a level-sensitive input signal or by two edge
detectors.
Figure 3. External Components for RTC
RTXO
C1
C2
X1
SUGGESTED COMPONENTS:
X1 = ECLIPTEK EC38J (THROUGH-HOLE PACKAGE) OR
EPSON MC405 12 pF LOAD (SURFACE-MOUNT PACKAGE)
C1 = 22 pF
C2 = 22 pF
R1 = 10 M
:
NOTE: C1 AND C2 ARE SPECIFIC TO CRYSTAL SPECIFIED FOR X1.
CONTACT CRYSTAL MANUFACTURER FOR DETAILS. C1 AND C2
SPECIFICATIONS ASSUME BOARD TRACE CAPACITANCE OF 3 pF.
RTXI
R1
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