参数资料
型号: PIC16F872-E/SS
厂商: Microchip Technology
文件页数: 156/167页
文件大小: 0K
描述: IC MCU CMOS 20MHZ 2K FLSH 28SSOP
产品培训模块: Asynchronous Stimulus
标准包装: 47
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,SPI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 22
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: 闪存
EEPROM 大小: 64 x 8
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 5x10b
振荡器型: 外部
工作温度: -40°C ~ 125°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
89
8048C–AVR–02/12
ATtiny43U
Figure 12-7. Phase Correct PWM Mode, Timing Diagram
The Timer/Counter Overflow Flag (TOVn) is set each time the counter reaches BOTTOM. The
Interrupt Flag can be used to generate an interrupt each time the counter reaches the BOTTOM
value.
In phase correct PWM mode, the compare unit allows generation of PWM waveforms on the
OCnx pins. Setting the COMnx[1:0] bits to two will produce a non-inverted PWM. An inverted
PWM output can be generated by setting the COMnx[1:0] to three: Setting the COMnA0 bits to
one allows the OCnA pin to toggle on Compare Matches if the WGMn2 bit is set. This option is
not available for the OCnB pin (See Table 12-4 on page 93). The actual OCnx 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 OCnx Register at the Compare Match between OCRnx
and TCNTn when the counter increments, and setting (or clearing) the OCnx Register at Com-
pare Match between OCRnx and TCNTn when the counter decrements. The PWM frequency for
the output when using phase correct PWM can be calculated by the following equation:
The N variable represents the prescale factor (1, 8, 64, 256, or 1024).
The extreme values for the OCRnA Register represent special cases when generating a PWM
waveform output in the phase correct PWM mode. If the OCRnA 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 12-7 on page 89 OCn has a transition from high to low
even though there is no Compare Match. The point of this transition is to guaratee symmetry
around BOTTOM. There are two cases that give a transition without Compare Match.
TOVn Interrupt Flag Set
OCnx Interrupt Flag Set
1
2
3
TCNTn
Period
OCn
(COMnx[1:0] = 2)
(COMnx[1:0] = 3)
OCRnx Update
f
OCnxPCPWM
fclk_I/O
N 510
------------------
=
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PIC16F872-I/SO 制造商:Microchip Technology Inc 功能描述:8BIT FLASH MCU SMD 16F872 SOIC28
PIC16F872-I/SOG 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O Lead Free Package 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
PIC16F872-I/SP 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O 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
PIC16F872-I/SP 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 16F872 SDIL28