參數(shù)資料
型號(hào): DSPIC30F4011-20I/P
廠商: Microchip Technology
文件頁(yè)數(shù): 238/238頁(yè)
文件大?。?/td> 0K
描述: IC DSPIC MCU/DSP 48K 40DIP
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: 10
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: 40-DIP(0.600",15.24mm)
包裝: 管件
配用: AC30F003-ND - MODULE SOCKET DSPIC30F 40DIP
ACICE0206-ND - ADAPTER MPLABICE 40P 600 MIL
其它名稱: DSPIC30F4011-20IP
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2010 Microchip Technology Inc.
DS70135G-page 99
dsPIC30F4011/4012
15.1
PWM Time Base
The PWM time base is provided by a 15-bit timer with
a prescaler and postscaler. The time base is accessible
via the PTMR SFR. PTMR<15> is a read-only status
bit, PTDIR, that indicates the present count direction of
the PWM time base. If PTDIR is cleared, PTMR is
counting upwards. If PTDIR is set, PTMR is counting
downwards. The PWM time base is configured via the
PTCON SFR. The time base is enabled/disabled by
setting/clearing the PTEN bit in the PTCON SFR.
PTMR is not cleared when the PTEN bit is cleared in
software.
The PTPER SFR sets the counting period for PTMR.
The user must write a 15-bit value to PTPER<14:0>.
When the value in PTMR<14:0> matches the value in
PTPER<14:0>, the time base will either reset to ‘0’, or
reverse the count direction on the next occurring clock
cycle. The action taken depends on the operating
mode of the time base.
The PWM time base can be configured for four different
modes of operation:
Free-Running mode
Single-Shot mode
Continuous Up/Down Count mode
Continuous Up/Down Count mode with interrupts
for double updates
These four modes are selected by the PTMOD<1:0>
bits in the PTCON SFR. The Continuous Up/Down
Count modes support center-aligned PWM generation.
The Single-Shot mode allows the PWM module to sup-
port pulse control of certain Electronically Commutative
Motors (ECMs).
The interrupt signals generated by the PWM time base
depend on the mode selection bits (PTMOD<1:0>) and
the postscaler bits (PTOPS<3:0>) in the PTCON SFR.
15.1.1
FREE-RUNNING MODE
In the Free-Running mode, the PWM time base counts
upwards until the value in the Time Base Period regis-
ter (PTPER) is matched. The PTMR register is reset on
the following input clock edge and the time base will
continue to count upwards as long as the PTEN bit
remains set.
When the PWM time base is in the Free-Running mode
(PTMOD<1:0> = 00), an interrupt event is generated
each time a match with the PTPER register occurs and
the PTMR register is reset to zero. The postscaler
selection bits may be used in this mode of the timer to
reduce the frequency of the interrupt events.
15.1.2
SINGLE-SHOT MODE
In the Single-Shot mode, the PWM time base begins
counting upwards when the PTEN bit is set. When the
value in the PTMR register matches the PTPER regis-
ter, the PTMR register will be reset on the following
input clock edge and the PTEN bit will be cleared by the
hardware to halt the time base.
When the PWM time base is in the Single-Shot mode
(PTMOD<1:0> = 01), an interrupt event is generated
when a match with the PTPER register occurs, the
PTMR register is reset to zero on the following input
clock edge and the PTEN bit is cleared. The postscaler
selection bits have no effect in this mode of the timer.
15.1.3
CONTINUOUS UP/DOWN COUNT
MODES
In the Continuous Up/Down Count modes, the PWM
time base counts upwards until the value in the PTPER
register is matched. The timer will begin counting
downwards on the following input clock edge. The
PTDIR bit in the PTMR SFR is read-only and indicates
the counting direction. The PTDIR bit is set when the
timer counts downwards.
In
the
Continuous
Up/Down
Count
mode
(PTMOD<1:0> = 10), an interrupt event is generated
each time the value of the PTMR register becomes
zero and the PWM time base begins to count upwards.
The postscaler selection bits may be used in this mode
of the timer to reduce the frequency of the interrupt
events.
Note:
If the Period register is set to 0x0000, the
timer will stop counting, and the interrupt
and special event trigger will not be gener-
ated even if the special event value is also
0x0000. The module will not update the
Period register if it is already at 0x0000;
therefore, the user must disable the
module in order to update the Period
register.
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