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PIC18F4431-I/P 参数 Datasheet PDF下载

PIC18F4431-I/P图片预览
型号: PIC18F4431-I/P
PDF下载: 下载PDF文件 查看货源
内容描述: 28 /40/ 44引脚增强型闪存微控制器采用纳瓦技术,高性能PWM和A / D [28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High-Performance PWM and A/D]
分类和应用: 闪存微控制器
文件页数/大小: 392 页 / 3127 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC18F2331/2431/4331/4431  
FIGURE 18-2:  
PWM MODULE BLOCK DIAGRAM, ONE OUTPUT PAIR, COMPLEMENTARY MODE  
VDD  
Dead-Band  
Generator  
PWM1  
Duty Cycle Comparator  
HPOL  
LPOL  
PWM Duty Cycle Register  
PWM0  
Fault Override Values  
Channel Override Values  
Fault A Pin  
Fault B Pin  
Fault Pin Assignment  
Logic  
Note:  
In Complementary mode, the even channel cannot be forced active by a Fault or override event when the odd channel is active.  
The even channel is always the complement of the odd channel and is inactive, with dead time inserted, before the odd channel  
is driven to its active state.  
FIGURE 18-3:  
PWM MODULE BLOCK DIAGRAM, ONE OUTPUT PAIR, INDEPENDENT MODE  
VDD  
PWM Duty Cycle Register  
PWM1  
Duty Cycle Comparator  
HPOL  
VDD  
PWM0  
Fault Override Values  
LPOL  
Channel Override Values  
Fault A Pin  
Fault B Pin  
Fault Pin Assignment  
Logic  
This module contains four duty cycle generators,  
numbered 0 through 3. The module has eight PWM  
output pins, numbered 0 through 7. The eight PWM  
outputs are grouped into output pairs of even and odd  
numbered outputs. In Complementary modes, the even  
PWM pins must always be the complement of the  
corresponding odd PWM pin. For example, PWM0 will  
be the complement of PWM1, PWM2 will be the  
complement of PWM3 and so on. The dead-time  
generator inserts an OFF period called “dead time”  
between the going OFF of one pin to the going ON of  
the complementary pin of the paired pins. This is to  
prevent damage to the power switching devices that  
will be connected to the PWM output pins.  
The time base for the PWM module is provided by its  
own 12-bit timer, which also incorporates selectable  
prescaler and postscaler options.  
2010 Microchip Technology Inc.  
DS39616D-page 175