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PIC16F818-I/SS 参数 Datasheet PDF下载

PIC16F818-I/SS图片预览
型号: PIC16F818-I/SS
PDF下载: 下载PDF文件 查看货源
内容描述: 二十零分之一十八引脚增强型闪存微控制器采用纳瓦技术 [18/20-Pin Enhanced Flash Microcontrollers with 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PC时钟
文件页数/大小: 176 页 / 2941 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC16F818/819  
The operating mode is determined by the clock select  
bit, TMR1CS (T1CON<1>).  
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>).  
In Timer mode, Timer1 increments every instruction  
cycle. In Counter mode, it increments on every rising  
edge of the external clock input.  
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 CCP1 module as the special  
event trigger (see Section 9.1 “Capture Mode”).  
Register 7-1 shows the Timer1 Control register.  
Timer1 can also be used to provide Real-Time Clock  
(RTC) functionality to applications with only a minimal  
addition of external components and code overhead.  
When the Timer1 oscillator is enabled (T1OSCEN is  
set), the RB6/T1OSO/T1CKI/PGC and RB7/T1OSI/  
PGD pins become inputs. That is, the TRISB<7:6>  
value is ignored and these pins read as ‘0’.  
7.1  
Timer1 Operation  
Additional information on timer modules is available in  
the “PICmicro® Mid-Range MCU Family Reference  
Manual” (DS33023).  
Timer1 can operate in one of three modes:  
• as a timer  
• as a synchronous counter  
• as an asynchronous counter  
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  
T1CKPS1 T1CKPS0 T1OSCEN T1SYNC TMR1CS TMR1ON  
bit 0  
bit 7  
bit 7-6  
bit 5-4  
Unimplemented: Read as ‘0’  
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 (the oscillator inverter is 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/PGC (on the rising edge)  
0= Internal clock (FOSC/4)  
TMR1ON: Timer1 On bit  
1= Enables Timer1  
0= Stops Timer1  
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  
2004 Microchip Technology Inc.  
DS39598E-page 57