参数资料
| 型号： | AT32UC3A0256-ALUT |
| 厂商： | Atmel |
| 文件页数： | 89/97页 |
| 文件大小： | 0K |
| 描述： | IC MCU AVR32 256KB FLASH 144LQFP |
| 产品培训模块： | AVR UC3 Audio Application MCU Product Line Introduction AVR EVK1105 Digital Audio Gateway Kit AVR® UC3 Introduction |
| 标准包装： | 300 |
| 系列： | AVR®32 UC3 A0 |
| 核心处理器： | AVR |
| 芯体尺寸： | 32-位 |
| 速度： | 66MHz |
| 连通性： | EBI/EMI，以太网，I²C，SPI，SSC，UART/USART，USB OTG |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 109 |
| 程序存储器容量： | 256KB（256K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 64K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 1.65 V ~ 1.95 V |
| 数据转换器： | A/D 8x10b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 144-LQFP |
| 包装： | 托盘 |
| 配用： | ATSTK600-RC33-ND - STK600 ROUTING CARD AVR ATEVK1105-ND - KIT EVAL FOR AT32UC3A0 ATAVRONEKIT-ND - KIT AVR/AVR32 DEBUGGER/PROGRMMR ATEVK1100-ND - KIT DEV/EVAL FOR AVR32 AT32UC3A |
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dsPIC30F6010
DS70119E-page 88
2006 Microchip Technology Inc.
15.1.4
DOUBLE UPDATE MODE
In the Double Update mode (PTMOD<1:0> = 11), an
interrupt event is generated each time the PTMR regis-
ter is equal to zero, as well as each time a period match
occurs. The postscaler selection bits have no effect in
this mode of the timer.
The Double Update mode provides two additional func-
tions to the user. First, the control loop bandwidth is
doubled because the PWM duty cycles can be
updated, twice per period. Second, asymmetrical cen-
ter-aligned PWM waveforms can be generated, which
are useful for minimizing output waveform distortion in
certain motor control applications.
15.1.5
PWM TIME BASE PRESCALER
The input clock to PTMR (FOSC/4), has prescaler
options of 1:1, 1:4, 1:16, or 1:64, selected by control
bits PTCKPS<1:0> in the PTCON SFR. The prescaler
counter is cleared when any of the following occurs:
a write to the PTMR register
a write to the PTCON register
any device Reset
The PTMR register is not cleared when PTCON is
written.
15.1.6
PWM TIME BASE POSTSCALER
The match output of PTMR can optionally be post-
scaled through a 4-bit postscaler (which gives a 1:1 to
1:16 scaling).
The postscaler counter is cleared when any of the
following occurs:
a write to the PTMR register
a write to the PTCON register
any device Reset
The PTMR register is not cleared when PTCON is written.
15.2
PWM Period
PTPER is a 15-bit register and is used to set the count-
ing period for the PWM time base. PTPER is a double-
buffered register. The PTPER buffer contents are
loaded into the PTPER register at the following instants:
Free Running and Single Shot modes: When the
PTMR register is reset to zero after a match with
the PTPER register.
Up/Down Counting modes: When the PTMR
register is zero.
The value held in the PTPER buffer is automatically
loaded into the PTPER register when the PWM time
base is disabled (PTEN = 0).
The
PWM
period
can
be
determined
using
EQUATION 15-1:
PWM PERIOD
If the PWM time base is configured for one of the Up/
Down Count modes, the PWM period will be twice the
value provided by Equation 15-2.
EQUATION 15-2:
PWM PERIOD (UP/DOWN
MODE)
The maximum resolution (in bits) for a given device
oscillator and PWM frequency can be determined using
EQUATION 15-3:
PWM RESOLUTION
15.3
Edge-Aligned PWM
Edge-aligned PWM signals are produced by the module
when the PWM time base is in the Free Running or Sin-
gle Shot mode. For edge-aligned PWM outputs, the out-
put has a period specified by the value in PTPER and a
duty cycle specified by the appropriate duty cycle regis-
ter (see Figure 15-2). The PWM output is driven active
at the beginning of the period (PTMR = 0) and is driven
inactive when the value in the duty cycle register
matches PTMR.
If the value in a particular duty cycle register is zero,
then the output on the corresponding PWM pin will be
inactive for the entire PWM period. In addition, the out-
put on the PWM pin will be active for the entire PWM
period if the value in the duty cycle register is greater
than the value held in the PTPER register.
Note:
Programming a value of 0x0001 in the
period register could generate a continu-
ous interrupt pulse, and hence, must be
avoided.
TPWM =
Tcy (PTPER + 1)
(PTMR Prescale Value)
TPWM =
2 Tcy (PTPER + 0.75)
(PTMR Prescale Value)
Resolution
=
log (2 Tpwm / Tcy)
log (2)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT32UC3A0256AU-ALUT | 功能描述:32位微控制器 - MCU 256KB Flash Audio 85Deg RoHS:否 制造商:Texas Instruments 核心:C28x 处理器系列:TMS320F28x 数据总线宽度:32 bit 最大时钟频率:90 MHz 程序存储器大小:64 KB 数据 RAM 大小:26 KB 片上 ADC:Yes 工作电源电压:2.97 V to 3.63 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:LQFP-80 安装风格:SMD/SMT |
| AT32UC3A0256-CTUR | 功能描述:32位微控制器 - MCU 256KB, 144FFBGA Ind RoHS:否 制造商:Texas Instruments 核心:C28x 处理器系列:TMS320F28x 数据总线宽度:32 bit 最大时钟频率:90 MHz 程序存储器大小:64 KB 数据 RAM 大小:26 KB 片上 ADC:Yes 工作电源电压:2.97 V to 3.63 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:LQFP-80 安装风格:SMD/SMT |
| AT32UC3A0256-CTUT | 功能描述:32位微控制器 - MCU 256KB, 144FFBGA Ind RoHS:否 制造商:Texas Instruments 核心:C28x 处理器系列:TMS320F28x 数据总线宽度:32 bit 最大时钟频率:90 MHz 程序存储器大小:64 KB 数据 RAM 大小:26 KB 片上 ADC:Yes 工作电源电压:2.97 V to 3.63 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:LQFP-80 安装风格:SMD/SMT |
| AT32UC3A0512 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:AVR32 32-Bit Microcontroller |
| AT32UC3A0512_08 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:AVR32 32-Bit Microcontroller |
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