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SH79F166AP/044PR bảng dữ liệu(PDF) 41 Page - SINOWEALTH Electronic Ltd

tên linh kiện SH79F166AP/044PR
Giải thích chi tiết về linh kiện  Enhanced 8051 Microcontroller with 10bit ADC
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SH79F166AP/044PR bảng dữ liệu(HTML) 41 Page - SINOWEALTH Electronic Ltd

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SH79F166A
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Mode2: Baud-Rate Generator
Timer2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON. The baud rates for transmit and receive
can be different if Timer2 is used for the receiver or transmitter and Timer4 is used for the other.
Setting RCLK and/or TCLK will put Timer2 into its baud rate generator mode, which is similar to the auto-reload mode.
Over flow of Timer2 will causes the Timer2 registers to be reloaded with the 16-bit value in registers RCAP2H and RCAP2L that
preset by software. But this will not generate an interrupt.
If EXEN2 is set, a 1-to-0 transition in T2EX will set EXF2 but will not cause a reload. Thus when Timer 2 is in use as a baud rate
generator, T2EX can be used as an extra external interrupt.
The baud rates in EUART Modes1 and 3 are determined by Timer2’s overflow rate according to the following equation.
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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