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參數(shù)資料
| 型號： | LPC2470 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Flashless 16-bit/32-bit micro; Ethernet, CAN, LCD, USB 2.0 device/host/OTG, external memory interface |
| 中文描述： | 毛邊16-bit/32-bit微，以太網(wǎng)，CAN，液晶顯示器，USB 2.0設(shè)備/主機/ OTG功能，外部存儲器接口 |
| 文件頁數(shù)： | 40/72頁 |
| 文件大?。?/td> | 365K |
| 代理商： | LPC2470 |
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LPC2470_0
NXP B.V. 2007. All rights reserved.
Preliminary data sheet
Rev. 00.01 — 5 October 2007
40 of 72
NXP Semiconductors
LPC2470
Fast communication chip
7.22 Pulse width modulator
The PWM is based on the standard Timer block and inherits all of its features, although
only the PWM function is pinned out on the LPC2470. The Timer is designed to count
cycles of the system derived clock and optionally switch pins, generate interrupts or
perform other actions when specified timer values occur, based on seven match registers.
The PWM function is in addition to these features and is based on match register events.
The ability to separately control rising and falling edge locations allows the PWM to be
used for more applications. For instance, multi-phase motor control typically requires
three non-overlapping PWM outputs with individual control of all three pulse widths and
positions.
Two match registers can be used to provide a single edge controlled PWM output. A
dedicated match register controls the PWM cycle rate, by resetting the count upon match.
The other match register controls the PWM edge position. Additional single edge
controlled PWM outputs require only one match register each, since the repetition rate is
the same for all PWM outputs. Multiple single edge controlled PWM outputs will all have a
rising edge at the beginning of each PWM cycle, when an PWMMR0 match occurs.
Three match registers can be used to provide a PWM output with both edges controlled.
Again, a dedicated match register controls the PWM cycle rate. The other match registers
control the two PWM edge positions. Additional double edge controlled PWM outputs
require only two match registers each, since the repetition rate is the same for all PWM
outputs.
With double edge controlled PWM outputs, specific match registers control the rising and
falling edge of the output. This allows both positive going PWM pulses (when the rising
edge occurs prior to the falling edge), and negative going PWM pulses (when the falling
edge occurs prior to the rising edge).
7.22.1
Features
LPC2470 has two PWMs with the same operational features. These may be operated
in a synchronized fashion by setting them both up to run at the same rate, then
enabling both simultaneously. PWM0 acts as the master and PWM1 as the slave for
this use.
Counter or Timer operation (may use the peripheral clock or one of the capture inputs
as the clock source).
Seven match registers allow up to 6 single edge controlled or 3 double edge
controlled PWM outputs, or a mix of both types. The match registers also allow:
–
Continuous operation with optional interrupt generation on match.
–
Stop timer on match with optional interrupt generation.
–
Reset timer on match with optional interrupt generation.
Supports single edge controlled and/or double edge controlled PWM outputs. Single
edge controlled PWM outputs all go high at the beginning of each cycle unless the
output is a constant low. Double edge controlled PWM outputs can have either edge
occur at any position within a cycle. This allows for both positive going and negative
going pulses.
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| LPC2470_11 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Flashless 16-bit/32-bit microcontroller; Ethernet, CAN, LCD, USB 2.0 device/host/OTG |
| LPC2470_1109 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Flashless 16-bit/32-bit microcontroller; Ethernet, CAN, LCD, USB 2.0 device/host/OTG, external memory interface |
| LPC2470FBD208 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Flashless 16-bit/32-bit micro; Ethernet, CAN, LCD, USB 2.0 device/host/OTG, external memory interface |
| LPC2470FBD208,551 | 功能描述:ARM微控制器 - MCU LCD CONT/ETHNET USB/HOST/OTG RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風格:SMD/SMT |
| LPC2470FET208 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Flashless 16-bit/32-bit micro; Ethernet, CAN, LCD, USB 2.0 device/host/OTG, external memory interface |
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