参数资料
型号: ATMEGA1284P-AU
厂商: Atmel
文件页数: 60/160页
文件大小: 0K
描述: MCU AVR 128K ISP FLASH 44-TQFP
产品培训模块: MCU Product Line Introduction
megaAVR Introduction
标准包装: 160
系列: AVR® ATmega
核心处理器: AVR
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,SPI,UART/USART
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 128KB(64K x 16)
程序存储器类型: 闪存
EEPROM 大小: 4K x 8
RAM 容量: 16K x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 5.5 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: 44-TQFP
包装: 托盘
产品目录页面: 614 (CN2011-ZH PDF)
配用: ATSTK600-RC31-ND - STK600 ROUTING CARD AVR
ATSTK600-TQFP44-ND - STK600 SOCKET/ADAPTER 44-TQFP
ATSTK600-ND - DEV KIT FOR AVR/AVR32
152
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
In phase correct PWM mode, the compare unit allows generation of PWM waveforms on the
OC2x pin. Setting the COM2x1:0 bits to two will produce a non-inverted PWM. An inverted PWM
output can be generated by setting the COM2x1:0 to three. TOP is defined as 0xFF when
WGM2:0 = 3, and OCR2A when WGM2:0 = 7 (See Table 17-4 on page 158). The actual OC2x
value will only be visible on the port pin if the data direction for the port pin is set as output. The
PWM waveform is generated by clearing (or setting) the OC2x Register at the compare match
between OCR2x and TCNT2 when the counter increments, and setting (or clearing) the OC2x
Register at compare match between OCR2x and TCNT2 when the counter decrements. The
PWM frequency for the output when using phase correct PWM can be calculated by the follow-
ing equation:
The N variable represents the prescale factor (1, 8, 32, 64, 128, 256, or 1024).
The extreme values for the OCR2A Register represent special cases when generating a PWM
waveform output in the phase correct PWM mode. If the OCR2A is set equal to BOTTOM, the
output will be continuously low and if set equal to MAX the output will be continuously high for
non-inverted PWM mode. For inverted PWM the output will have the opposite logic values.
At the very start of period 2 in Figure 17-7 on page 151 OCnx has a transition from high to low
even though there is no Compare Match. The point of this transition is to guarantee symmetry
around BOTTOM. There are two cases that give a transition without Compare Match.
OCR2A changes its value from MAX, like in Figure 17-7 on page 151. When the OCR2A value
is MAX the OCn pin value is the same as the result of a down-counting compare match. To
ensure symmetry around BOTTOM the OCn value at MAX must correspond to the result of an
up-counting Compare Match
The timer starts counting from a value higher than the one in OCR2A, and for that reason
misses the Compare Match and hence the OCn change that would have happened on the way
up
17.8
Timer/Counter Timing diagrams
The following figures show the Timer/Counter in synchronous mode, and the timer clock (clk
T2)
is therefore shown as a clock enable signal. In asynchronous mode, clk
I/O should be replaced by
the Timer/Counter Oscillator clock. The figures include information on when Interrupt Flags are
set. Figure 17-8 on page 153 contains timing data for basic Timer/Counter operation. The figure
shows the count sequence close to the MAX value in all modes other than phase correct PWM
mode.
f
OCnxPCPWM
f
clk_I/O
N 510
------------------
=
相关PDF资料
PDF描述
VE-JV1-IY-F4 CONVERTER MOD DC/DC 12V 50W
ATMEGA1284P-MU MCU AVR 128K ISP FLASH 44-QFN
VE-JV1-IY-F3 CONVERTER MOD DC/DC 12V 50W
VE-B3Y-IX-F4 CONVERTER MOD DC/DC 3.3V 49.5W
VE-B3Y-IX-F2 CONVERTER MOD DC/DC 3.3V 49.5W
相关代理商/技术参数
参数描述
ATMEGA1284P-AUR 功能描述:8位微控制器 -MCU AVR,128KB FLASH,1.8V 4KB EE 16KB SRAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATMEGA1284P-MU 功能描述:8位微控制器 -MCU 128KB Flash 20MHz 1.8V-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATMEGA1284P-MUR 功能描述:8位微控制器 -MCU AVR,128KB FLASH,1.8V 4KB EE 16KB SRAM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATMEGA1284P-PU 功能描述:8位微控制器 -MCU 128KB Flash 20MHz 1.8V-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
ATMEGA1284PR212-AU 功能描述:8位微控制器 -MCU ATmega 1284P-AU AT86RF212-ZU RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT