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PIC16F688-I/ST 参数 Datasheet PDF下载

PIC16F688-I/ST图片预览
型号: PIC16F688-I/ST
PDF下载: 下载PDF文件 查看货源
内容描述: 14引脚基于闪存的8位CMOS微控制器采用纳瓦技术 [14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology]
分类和应用: 闪存微控制器
文件页数/大小: 202 页 / 3832 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC16F688  
2.2.2.2  
OPTION Register  
Note:  
To achieve a 1:1 prescaler assignment for  
Timer0, assign the prescaler to the WDT  
by setting PSA bit of the OPTION register  
to ‘1’. See Section 5.1.3 “Software  
Programmable Prescaler”.  
The OPTION register is a readable and writable  
register, which contains various control bits to  
configure:  
• Timer0/WDT prescaler  
• External RA2/INT interrupt  
• Timer0  
• Weak pull-ups on PORTA  
REGISTER 2-2:  
OPTION_REG: OPTION REGISTER  
R/W-1  
RAPU  
R/W-1  
R/W-1  
T0CS  
R/W-1  
T0SE  
R/W-1  
PSA  
R/W-1  
PS2  
R/W-1  
PS1  
R/W-1  
PS0  
INTEDG  
bit 7  
bit 0  
Legend:  
R = Readable bit  
-n = Value at POR  
W = Writable bit  
‘1’ = Bit is set  
U = Unimplemented bit, read as ‘0’  
‘0’ = Bit is cleared x = Bit is unknown  
bit 7  
bit 6  
bit 5  
bit 4  
bit 3  
bit 2-0  
RAPU: PORTA Pull-up Enable bit  
1= PORTA pull-ups are disabled  
0= PORTA pull-ups are enabled by individual PORT latch values  
INTEDG: Interrupt Edge Select bit  
1= Interrupt on rising edge of RA2/INT pin  
0= Interrupt on falling edge of RA2/INT pin  
T0CS: Timer0 Clock Source Select bit  
1= Transition on RA2/T0CKI pin  
0= Internal instruction cycle clock (FOSC/4)  
T0SE: Timer0 Source Edge Select bit  
1= Increment on high-to-low transition on RA2/T0CKI pin  
0= Increment on low-to-high transition on RA2/T0CKI pin  
PSA: Prescaler Assignment bit  
1= Prescaler is assigned to the WDT  
0= Prescaler is assigned to the Timer0 module  
PS<2:0>: Prescaler Rate Select bits  
Bit Value  
Timer0 Rate WDT Rate  
000  
001  
010  
011  
100  
101  
110  
111  
1 : 2  
1 : 4  
1 : 8  
1 : 16  
1 : 32  
1 : 64  
1 : 128  
1 : 256  
1 : 1  
1 : 2  
1 : 4  
1 : 8  
1 : 16  
1 : 32  
1 : 64  
1 : 128  
DS41203D-page 14  
© 2007 Microchip Technology Inc.  
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