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PIC18F4520-I/P 参数 Datasheet PDF下载

PIC18F4520-I/P图片预览
型号: PIC18F4520-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与10位A / D和纳瓦技术 [28/40/44-Pin Enhanced 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: 412 页 / 6898 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC18F2420/2520/4420/4520  
REGISTER 4-1:  
RCON: RESET CONTROL REGISTER  
R/W-0  
IPEN  
R/W-1(1)  
U-0  
R/W-1  
RI  
R-1  
TO  
R-1  
PD  
R/W-0(2)  
POR  
R/W-0  
BOR  
SBOREN  
bit 7  
bit 0  
Legend:  
R = Readable bit  
W = Writable bit  
‘1’ = Bit is set  
U = Unimplemented bit, read as ‘0’  
‘0’ = Bit is cleared x = Bit is unknown  
-n = Value at POR  
bit 7  
bit 6  
IPEN: Interrupt Priority Enable bit  
1= Enable priority levels on interrupts  
0= Disable priority levels on interrupts (PIC16CXXX Compatibility mode)  
SBOREN: BOR Software Enable bit(1)  
If BOREN1:BOREN0 = 01:  
1= BOR is enabled  
0= BOR is disabled  
If BOREN1:BOREN0 = 00, 10or 11:  
Bit is disabled and read as ‘0’.  
bit 5  
bit 4  
Unimplemented: Read as ‘0’  
RI: RESETInstruction Flag bit  
1= The RESETinstruction was not executed (set by firmware only)  
0= The RESET instruction was executed causing a device Reset (must be set in software after a  
Brown-out Reset occurs)  
bit 3  
bit 2  
bit 1  
bit 0  
TO: Watchdog Time-out Flag bit  
1= Set by power-up, CLRWDTinstruction or SLEEPinstruction  
0= A WDT time-out occurred  
PD: Power-Down Detection Flag bit  
1= Set by power-up or by the CLRWDTinstruction  
0= Set by execution of the SLEEPinstruction  
POR: Power-on Reset Status bit  
1= A Power-on Reset has not occurred (set by firmware only)  
0= A Power-on Reset occurred (must be set in software after a Power-on Reset occurs)  
BOR: Brown-out Reset Status bit  
1= A Brown-out Reset has not occurred (set by firmware only)  
0= A Brown-out Reset occurred (must be set in software after a Brown-out Reset occurs)  
Note 1: If SBOREN is enabled, its Reset state is ‘1’; otherwise, it is ‘0’.  
2: The actual Reset value of POR is determined by the type of device Reset. See the notes following this  
register and Section 4.6 “Reset State of Registers” for additional information.  
Note 1: It is recommended that the POR bit be set after a Power-on Reset has been detected so that subsequent  
Power-on Resets may be detected.  
2: Brown-out Reset is said to have occurred when BOR is ‘0’ and POR is ‘1’ (assuming that POR was set to  
1’ by software immediately after a Power-on Reset).  
DS39631E-page 42  
© 2008 Microchip Technology Inc.  
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