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SH79F166AP044PR Datasheet(PDF) 43 Page - List of Unclassifed Manufacturers

Part # SH79F166AP044PR
Description  Enhanced 8051 microcontroller with 10-bit ADC
PDF  113 Pages
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Manufacturer  ETC1 [List of Unclassifed Manufacturers]
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SH79F166AP044PR Datasheet(HTML) 43 Page - List of Unclassifed Manufacturers

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SH79F166A
43
方式3:可编程时钟输出
T2(P0.5)可以编程输出50%的占空比时钟周期。清C/T2
———
位和置T2OE位,使定时器2作为时钟发生器。TR2位启动和中止
定时器。
在这种方式中,T2输出占空比为50%的时钟:
RCAP2L]
[RCAP2H,
65536
SYS
f
2
2
1
Frequency
Out
Clock
−
×
×
=
定时器2溢出不产生中断。所以定时器2可以同时以相同频率用作波特率发生器和时钟输出。
TR2
=0
=1
The Block Diagram of Programmable Clock output (Mode 3) of Timer2
T2
T2OE
TL2
TH2
RCAP2L
RCAP2H
EXEN2
EXF2
0:Switch Off
1:Switch On
T2EX
C/ T2
C/ T2
/2
/2
System Clock
0:Switch Off
1:Switch On
Timer2 Interrupt
Request
0:Switch Off
1:Switch On
注意:
(1) TF2 和 EXF2 都能引起定时器 2 的中断请求,两者有相同的向量地址。
(2) 当事件发生时或其它任何时间都能由软件设置 TF2 和 EXF2 为 1,只有软件以及硬件复位才能使之清 0。
(3) 当 EA = 1 且 ET2 = 1 时,设置 TF2 或 EXF2 为 1 能引起定时器 2 中断。
(4) 当定时器 2 作为波特率发生器时,写入 TH2/TL2,写入 RCAPH2/RCAPL2 会影响波特率的准确性,因此也会引起通信
出错。



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