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PIC16F767-I/SP 参数 Datasheet PDF下载

PIC16F767-I/SP图片预览
型号: PIC16F767-I/SP
PDF下载: 下载PDF文件 查看货源
内容描述: 28 /40/ 44引脚, 8位CMOS闪存微控制器与10位A / D和纳瓦技术 [28/40/44-Pin, 8-Bit CMOS Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology]
分类和应用: 闪存微控制器和处理器外围集成电路光电二极管时钟
文件页数/大小: 276 页 / 4898 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC16F7X7  
The following steps are needed to set up the LVD  
module:  
15.10 Operation  
Depending on the power source for the device voltage,  
the voltage normally decreases relatively slowly. This  
means that the LVD module does not need to be  
constantly operating. To decrease the current require-  
ments, the LVD circuitry only needs to be enabled for  
short periods where the voltage is checked. After doing  
the check, the LVD module may be disabled.  
1. Write the value to the LVDL3:LVDL0 bits  
(LVDCON register) which selects the desired  
LVD trip point.  
2. Ensure that LVD interrupts are disabled (the  
LVDIE bit is cleared or the GIE bit is cleared).  
3. Enable the LVD module (set the LVDEN bit in  
the LVDCON register).  
Each time that the LVD module is enabled, the circuitry  
requires some time to stabilize. After the circuitry has  
stabilized, all status flags may be cleared. The module  
will then indicate the proper state of the system.  
4. Wait for the LVD module to stabilize (the IRVST  
bit to become set).  
5. Clear the LVD interrupt flag, which may have  
falsely become set, until the LVD module has  
stabilized (clear the LVDIF bit).  
6. Enable the LVD interrupt (set the LVDIE and the  
GIE bits).  
Figure 15-6 shows the typical waveforms that the LVD  
module may be used to detect.  
FIGURE 15-6:  
LOW-VOLTAGE DETECT WAVEFORMS  
CASE 1:  
LVDIF may not be set  
VDD  
VLVD  
LVDIF  
Enable LVD  
Internally Generated  
Reference Stable  
TIRVST  
LVDIF cleared in software  
CASE 2:  
VDD  
VLVD  
LVDIF  
Enable LVD  
TIRVST  
Internally Generated  
Reference Stable  
LVDIF cleared in software  
LVDIF cleared in software,  
LVDIF remains set since LVD condition still exists  
2004 Microchip Technology Inc.  
DS30498C-page 177  
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