參數(shù)資料
型號(hào): DSPIC30F4011-20I/PT
廠商: Microchip Technology
文件頁(yè)數(shù): 70/238頁(yè)
文件大?。?/td> 0K
描述: IC DSPIC MCU/DSP 48K 44TQFP
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: 160
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): 30
程序存儲(chǔ)器容量: 48KB(16K 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 9x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 托盤
配用: XLT44PT3-ND - SOCKET TRAN ICE 44MQFP/TQFP
AC164305-ND - MODULE SKT FOR PM3 44TQFP
其它名稱: DSPIC30F401120IPT
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2010 Microchip Technology Inc.
DS70135G-page 161
dsPIC30F4011/4012
21.4
Watchdog Timer (WDT)
21.4.1
WATCHDOG TIMER OPERATION
The primary function of the Watchdog Timer (WDT) is
to reset the processor in the event of a software
malfunction. The WDT is a free-running timer that runs
off an on-chip RC oscillator, requiring no external
component. Therefore, the WDT timer continues to
operate even if the main processor clock (e.g., the
crystal oscillator) fails.
21.4.2
ENABLING AND DISABLING
THE WDT
The Watchdog Timer can be “Enabled” or “Disabled”
only through a Configuration bit (FWDTEN) in the
Configuration register, FWDT.
Setting FWDTEN = 1 enables the Watchdog Timer.
The enabling is done when programming the device.
By default, after chip erase, FWDTEN bit = 1. Any
device
programmer
capable
of
programming
dsPIC30F devices allows programming of this and
other Configuration bits.
If enabled, the WDT increments until it overflows or
“times out”. A WDT time-out forces a device Reset
(except during Sleep). To prevent a WDT time-out, the
user must clear the Watchdog Timer using a CLRWDT
instruction.
If a WDT times out during Sleep, the device wakes-up.
The WDTO bit in the RCON register is cleared to
indicate a wake-up resulting from a WDT time-out.
Setting FWDTEN = 0 allows user software to enable/
disable the Watchdog Timer via the SWDTEN
(RCON<5>) control bit.
21.5
Power-Saving Modes
There are two power-saving states that can be entered
through the execution of a special instruction, PWRSAV.
These are: Sleep and Idle.
The format of the PWRSAV instruction is as follows:
PWRSAV <parameter>
where,
‘parameter’ defines Idle or Sleep mode.
21.5.1
SLEEP MODE
In Sleep mode, the clock to the CPU and peripherals is
shut down. If an on-chip oscillator is being used, it is
shut down.
The Fail-Safe Clock Monitor is not functional during
Sleep, since there is no clock to monitor. However, the
LPRC clock remains active if WDT is operational during
Sleep.
The Brown-out Reset protection circuit and the Low-
Voltage Detect (LVD) circuit, if enabled, remain
functional during Sleep.
The processor wakes up from Sleep if at least one of
the following conditions has occurred:
Any interrupt that is individually enabled and
meets the required priority level
Any Reset (POR, BOR and MCLR)
WDT time-out
On waking up from Sleep mode, the processor restarts
the same clock that was active prior to entry into Sleep
mode.
When
clock
switching
is
enabled,
bits
COSC<1:0> determine the oscillator source to be
used on wake-up. If clock switch is disabled, then
there is only one system clock.
If the clock source is an oscillator, the clock to the
device is held off until OST times out (indicating a
stable oscillator). If PLL is used, the system clock is
held off until LOCK = 1 (indicating that the PLL is
stable). In either case, TPOR, TLOCK and TPWRT delays
are applied.
If EC, FRC, LPRC or ERC oscillators are used, then a
delay of TPOR (~10
μs) is applied. This is the smallest
delay possible on wake-up from Sleep.
Moreover, if the LP oscillator was active during Sleep,
and LP is the oscillator used on wake-up, then the start-
up delay is equal to TPOR. PWRT and OST delays are
not applied. In order to have the smallest possible start-
up delay when waking up from Sleep, one of these
faster wake-up options should be selected before
entering Sleep.
Note:
If a POR or BOR occurred, the selection of
the oscillator is based on the FOS<1:0>
and FPR<3:0> Configuration bits.
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