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SH79F166AP044PR Datasheet(PDF) 42 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) 42 Page - List of Unclassifed Manufacturers

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SH79F166A
42
方式2：波特率发生器
通过设置T2CON寄存器中的TCLK和/或RCLK选择定时器2作为波特率发生器。接收器和发送器的波特率可以不同，如果定
时器2作为接收器或发送器则定时器4相应的作为另一种的波特率发生器。
设置RCLK和/或TCLK使定时器2进入波特率发生器方式，该方式与自动重载入方式相似。
定时器2的溢出会使RCAP2H和RCAP2L寄存器中的值重载入定时器2计数器，但不会产生中断。
如果EXEN2被置1，在T2EX脚上的下降沿会置起EXF2，但不会引起重载。因此当定时器2作为波特率发生器时，T2EX可作
为一个额外的外部中断。
在EUART方式1和3中的波特率由定时器2的溢出率根据下列方程式决定。
RCAP2L]
[RCAP2H,
65536
SYS
f
16
2
1
BaudRate
−
×
×
=
; C/T2
———
= 0
RCAP2L]
[RCAP2H,
65536
T2
f
16
1
BaudRate
−
×
=
; C/T2
———
= 1
System Clock
TR2
C/ T2
0:Switch Off
1:Switch On
The Block Diagram of Baud-Rate Generator ( Mode 2 ) of Timer2
/16
/16
Timer4
overflow
/2
RCLK
=1
=0
TCLK
=1
=0
SMOD
=0
=1
TL2
TH2
RCAP2L
RCAP2H
EXEN2
EXF2
T2EX
/2
T2
0:Switch Off
1:Switch On
=0
=1
Timer2 Interrupt
Request
UART receiver
clock source
UART transiver
clock source



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