參數(shù)資料
型號(hào)： DSPIC30F4013-30I/PT
廠商： Microchip Technology
文件頁(yè)數(shù)： 53/153頁(yè)
文件大小： 0K
描述： IC DSPIC MCU/DSP 48K 44TQFP
產(chǎn)品培訓(xùn)模塊： 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： 30 MIP
連通性： CAN，I²C，SPI，UART/USART
外圍設(shè)備： AC'97，欠壓檢測(cè)/復(fù)位，I²S，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 13x12b
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
產(chǎn)品目錄頁(yè)面： 651 (CN2011-ZH PDF)
配用： XLT44PT3-ND - SOCKET TRAN ICE 44MQFP/TQFP
AC164305-ND - MODULE SKT FOR PM3 44TQFP
DV164005-ND - KIT ICD2 SIMPLE SUIT W/USB CABLE
其它名稱： DSPIC30F401330IPT
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dsPIC30F3014/4013
DS70138G-page 146
2010 Microchip Technology Inc.
20.2.7
FAIL-SAFE CLOCK MONITOR
The Fail-Safe Clock Monitor (FSCM) allows the device
to continue to operate even in the event of an oscillator
failure. The FSCM function is enabled by appropriately
programming the FCKSM Configuration bits (clock
switch and monitor selection bits) in the FOSC Device
Configuration register. If the FSCM function is enabled,
the LPRC internal oscillator runs at all times (except
during Sleep mode) and is not subject to control by the
SWDTEN bit.
In the event of an oscillator failure, the FSCM
generates a clock failure trap event and switches the
system clock over to the FRC oscillator. The user then
has the option to either attempt to restart the oscillator
or execute a controlled shutdown. The user may decide
to treat the trap as a warm Reset by simply loading the
Reset address into the oscillator fail trap vector. In this
event, the CF (Clock Fail) status bit (OSCCON<3>) is
also set whenever a clock failure is recognized.
In the event of a clock failure, the WDT is unaffected
and continues to run on the LPRC clock.
If the oscillator has a very slow start-up time coming out
of POR, BOR or Sleep, it is possible that the PWRT
timer will expire before the oscillator has started. In
such cases, the FSCM is activated and the FSCM initi-
ates a clock failure trap, and the COSC<2:0> bits are
loaded with FRC oscillator selection. This effectively
shuts off the original oscillator that was trying to start.
The user may detect this situation and restart the
oscillator in the clock fail trap ISR.
Upon a clock failure detection, the FSCM module
initiates a clock switch to the FRC oscillator as follows:
1.
The COSC bits (OSCCON<14:12>) are loaded
with the FRC oscillator selection value.
2.
CF bit is set (OSCCON<3>).
3.
OSWEN control bit (OSCCON<0>) is cleared.
For the purpose of clock switching, the clock sources
are sectioned into four groups:
Primary
Secondary
Internal FRC
Internal LPRC
The user can switch between these functional groups
but cannot switch between options within a group. If the
primary group is selected, then the choice within the
group
is
always
determined
by
the
FPR<4:0>
Configuration bits.
The OSCCON register holds the control and status bits
related to clock switching.
COSC<2:0>: Read-only status bits always reflect
the current oscillator group in effect.
NOSC<2:0>: Control bits which are written to
indicate the new oscillator group of choice.
- On POR and BOR, COSC<2:0> and
NOSC<2:0> are both loaded with the
Configuration bit values, FOS<2:0>.
LOCK: The LOCK status bit indicates a PLL lock.
CF: Read-only status bit indicating if a clock fail
detect has occurred.
OSWEN: Control bit changes from a ‘0’ to a ‘1’
when a clock transition sequence is initiated.
Clearing the OSWEN control bit aborts a clock
transition in progress (used for hang-up
situations).
If Configuration bits, FCKSM<1:0> = 1x, then the clock
switching and Fail-Safe Clock Monitor functions are
disabled. This is the default Configuration bit setting.
If clock switching is disabled, then the FOS<2:0> and
FPR<4:0> bits directly control the oscillator selection
and the COSC<2:0> bits do not control the clock
selection. However, these bits reflect the clock source
selection.
20.2.8
PROTECTION AGAINST
ACCIDENTAL WRITES TO OSCCON
A write to the OSCCON register is intentionally made
difficult because it controls clock switching and clock
scaling.
To write to the OSCCON low byte, the following code
sequence must be executed without any other
instructions in between:
Byte Write 0x46 to OSCCON low
Byte Write 0x57 to OSCCON low
Byte write is allowed for one instruction cycle. Write the
desired value or use bit manipulation instruction.
To write to the OSCCON high byte, the following
instructions must be executed without any other
instructions in between:
Byte Write 0x78 to OSCCON high
Byte Write 0x9A to OSCCON high
Byte write is allowed for one instruction cycle. Write the
desired value or use bit manipulation instruction.
Note:
The application should not attempt to
switch to a clock of frequency lower than
100 kHz when the Fail-Safe Clock Monitor
is enabled. If such clock switching is
performed, the device may generate an
oscillator fail trap and switch to the Fast
RC oscillator.
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