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PIC10F200T-I/OT 参数 Datasheet PDF下载

PIC10F200T-I/OT图片预览
型号: PIC10F200T-I/OT
PDF下载: 下载PDF文件 查看货源
内容描述: 6引脚8位闪存微控制器 [6-Pin, 8-Bit Flash 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PC时钟
文件页数/大小: 96 页 / 1447 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC10F200/202/204/206  
6.1.2  
TIMER0 INCREMENT DELAY  
Since the prescaler output is synchronized with the  
internal clocks, there is a small delay from the time the  
external clock edge occurs to the time the Timer0  
module is actually incremented. Figure 6-4 shows the  
delay from the external clock edge to the timer  
incrementing.  
FIGURE 6-4:  
TIMER0 TIMING WITH EXTERNAL CLOCK  
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4  
Small pulse  
misses sampling  
External Clock Input or  
(2)  
Prescaler Output  
(1)  
External Clock/Prescaler  
Output After Sampling  
(3)  
Increment Timer0 (Q4)  
Timer0  
T0  
T0 + 1  
T0 + 2  
Note 1: Delay from clock input change to Timer0 increment is 3 TOSC to 7 TOSC (Duration of Q = TOSC). Therefore, the error  
in measuring the interval between two edges on Timer0 input = ±4 TOSC max.  
2: External clock if no prescaler selected; prescaler output otherwise.  
3: The arrows indicate the points in time where sampling occurs.  
6.2.1  
SWITCHING PRESCALER  
ASSIGNMENT  
6.2  
Prescaler  
An 8-bit counter is available as a prescaler for the  
Timer0 module or as a postscaler for the Watchdog  
Timer (WDT), respectively (see Section 9.6 “Watch-  
dog Timer (WDT)”). For simplicity, this counter is  
being referred to as “prescaler” throughout this data  
sheet.  
The prescaler assignment is fully under software  
control (i.e., it can be changed “on-the-fly” during pro-  
gram execution). To avoid an unintended device Reset,  
the following instruction sequence (Example 6-1) must  
be executed when changing the prescaler assignment  
from Timer0 to the WDT.  
Note:  
The prescaler may be used by either the  
Timer0 module or the WDT, but not both.  
Thus, a prescaler assignment for the  
Timer0 module means that there is no  
prescaler for the WDT and vice versa.  
EXAMPLE 6-1:  
CHANGING PRESCALER  
(TIMER0 WDT)  
CLRWDT  
CLRF  
;Clear WDT  
TMR0  
;Clear TMR0 & Prescaler  
MOVLW ‘00xx1111’b;These 3 lines (5, 6, 7)  
The PSA and PS<2:0> bits (OPTION<3:0>) determine  
prescaler assignment and prescale ratio.  
OPTION  
;are required only if  
;desired  
When assigned to the Timer0 module, all instructions  
writing to the TMR0 register (e.g., CLRF 1, MOVWF 1,  
BSF 1,x, etc.) will clear the prescaler. When assigned  
to WDT, a CLRWDT instruction will clear the prescaler  
along with the WDT. The prescaler is neither readable  
nor writable. On a Reset, the prescaler contains all ‘0’s.  
CLRWDT  
;PS<2:0> are 000 or 001  
MOVLW ‘00xx1xxx’b;Set Postscaler to  
OPTION ;desired WDT rate  
© 2007 Microchip Technology Inc.  
DS41239D-page 31