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PIC16F627-20/P 参数 Datasheet PDF下载

PIC16F627-20/P图片预览
型号: PIC16F627-20/P
PDF下载: 下载PDF文件 查看货源
内容描述: 基于闪存的8位CMOS微控制器 [FLASH-Based 8-Bit CMOS Microcontrollers]
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: 160 页 / 1657 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC16F62X  
In timer mode, Timer1 increments every instruction  
cycle. In counter mode, it increments on every rising  
edge of the external clock input.  
7.0  
TIMER1 MODULE  
The Timer1 module is a 16-bit timer/counter consisting  
of two 8-bit registers (TMR1H and TMR1L) which are  
readable and writable. The TMR1 Register pair  
(TMR1H:TMR1L) increments from 0000h to FFFFh  
and rolls over to 0000h. The TMR1 Interrupt, if enabled,  
is generated on overflow which is latched in interrupt  
flag bit TMR1IF (PIR1<0>). This interrupt can be  
enabled/disabled by setting/clearing TMR1 interrupt  
enable bit TMR1IE (PIE1<0>).  
Timer1 can be enabled/disabled by setting/clearing  
control bit TMR1ON (T1CON<0>).  
Timer1 also has an internal “reset input”. This reset can  
be generated by the CCP module (Section 10.0).  
Register 7-1 shows the Timer1 control register.  
For the PIC16F627 and PIC16F628, when the Timer1  
oscillator is enabled (T1OSCEN is set), the RB7/T1OSI  
and RB6/T1OSO/T1CKI pins become inputs. That is,  
the TRISB<7:6> value is ignored.  
Timer1 can operate in one of two modes:  
• As a timer  
• As a counter  
The operating mode is determined by the clock select  
bit, TMR1CS (T1CON<1>).  
REGISTER 7-1: T1CON: TIMER1 CONTROL REGISTER (ADDRESS 10h)  
U-0  
U-0  
R/W-0  
R/W-0  
R/W-0  
R/W-0  
R/W-0  
R/W-0  
R = Readable bit  
W = Writable bit  
U = Unimplemented bit,  
read as ‘0’  
T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON  
bit0  
bit7  
- n = Value at POR reset  
bit 7-6: Unimplemented: Read as '0'  
bit 5-4: T1CKPS1:T1CKPS0: Timer1 Input Clock Prescale Select bits  
11= 1:8 Prescale value  
10= 1:4 Prescale value  
01= 1:2 Prescale value  
00= 1:1 Prescale value  
bit 3:  
bit 2:  
T1OSCEN: Timer1 Oscillator Enable Control bit  
1= Oscillator is enabled  
0= Oscillator is shut off  
Note: The oscillator inverter and feedback resistor are turned off to eliminate power drain  
T1SYNC: Timer1 External Clock Input Synchronization Control bit  
TMR1CS = 1  
1= Do not synchronize external clock input  
0= Synchronize external clock input  
TMR1CS = 0  
This bit is ignored. Timer1 uses the internal clock when TMR1CS = 0.  
bit 1:  
bit 0:  
TMR1CS: Timer1 Clock Source Select bit  
1= External clock from pin RB6/T1OSO/T1CKI (on the rising edge)  
0= Internal clock (FOSC/4)  
TMR1ON: Timer1 On bit  
1= Enables Timer1  
0= Stops Timer1  
DS40300B-page 50  
Preliminary  
1999 Microchip Technology Inc.