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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  
FIGURE 6-3:  
TIMER0 TIMING: INTERNAL CLOCK/PRESCALE 1:2  
PC  
(Program  
Counter)  
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4  
PC – 1 PC PC + 1 PC + 2 PC + 3 PC + 4 PC + 5 PC + 6  
MOVWF TMR0 MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W MOVF TMR0,W  
Instruction  
Fetch  
T0  
T0 + 1  
NT0  
NT0 + 1  
Timer0  
Instruction  
Executed  
Read TMR0  
reads NT0 + 1  
Read TMR0  
reads NT0  
Read TMR0  
reads NT0  
Read TMR0  
reads NT0  
Read TMR0  
reads NT0 + 2  
Write TMR0  
executed  
TABLE 6-1:  
REGISTERS ASSOCIATED WITH TIMER0  
Value on  
Power-On  
Reset  
Value on  
All Other  
Resets  
Address  
Name  
Bit 7  
Bit 6  
Bit 5  
Bit 4  
Bit 3  
Bit 2  
Bit 1  
Bit 0  
01h  
N/A  
N/A  
TMR0  
Timer0 – 8-bit Real-Time Clock/Counter  
GPWU GPPU T0CS T0SE PSA  
xxxx xxxx  
1111 1111  
---- 1111  
uuuu uuuu  
1111 1111  
---- 1111  
OPTION  
TRISGPIO  
PS2  
PS1  
PS0  
(1)  
I/O Control Register  
Legend: Shaded cells not used by Timer0. – = unimplemented, x = unknown, u= unchanged.  
Note 1: The TRIS of the T0CKI pin is overridden when T0CS = 1.  
6.1.1  
EXTERNAL CLOCK  
SYNCHRONIZATION  
6.1  
Using Timer0 with an External  
Clock (PIC10F200/202)  
When no prescaler is used, the external clock input is  
the same as the prescaler output. The synchronization  
of T0CKI with the internal phase clocks is accom-  
plished by sampling the prescaler output on the Q2 and  
Q4 cycles of the internal phase clocks (Figure 6-4).  
Therefore, it is necessary for T0CKI to be high for at  
least 2 TOSC (and a small RC delay of 2 Tt0H) and low  
for at least 2 TOSC (and a small RC delay of 2 Tt0H).  
Refer to the electrical specification of the desired  
device.  
When an external clock input is used for Timer0, it must  
meet certain requirements. The external clock require-  
ment is due to internal phase clock (TOSC) synchroniza-  
tion. Also, there is a delay in the actual incrementing of  
Timer0 after synchronization.  
When a prescaler is used, the external clock input is  
divided by the asynchronous ripple counter-type  
prescaler, so that the prescaler output is symmetrical.  
For the external clock to meet the sampling require-  
ment, the ripple counter must be taken into account.  
Therefore, it is necessary for T0CKI to have a period of  
at least 4 TOSC (and a small RC delay of 4 Tt0H) divided  
by the prescaler value. The only requirement on T0CKI  
high and low time is that they do not violate the  
minimum pulse width requirement of Tt0H. Refer to  
parameters 40, 41 and 42 in the electrical specification  
of the desired device.  
DS41239D-page 30  
© 2007 Microchip Technology Inc.