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AT89C51ED2-RDTUM Datasheet(PDF) 52 Page - ATMEL Corporation

No. de pieza AT89C51ED2-RDTUM
Descripción Electrónicos  8-bit Flash Microcontroller
PDF  137 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTUM Datasheet(HTML) 52 Page - ATMEL Corporation

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4235K–8051–05/08
AT89C51RD2/ED2
Table 14-3.
Baud Rate Selection Table UART
14.4.1
Internal Baud Rate Generator (BRG)
When the internal Baud Rate Generator is used, the Baud Rates are determined by the BRG
overflow depending on the BRL reload value, the value of SPD bit (Speed Mode) in BDRCON
register and the value of the SMOD1 bit in PCON register.
Figure 14-5. Internal Baud Rate
• The baud rate for UART is token by formula:
TCLK
(T2CON)
RCLK
(T2CON)
TBCK
(BDRCON)
RBCK
(BDRCON)
Clock Source
UART Tx
Clock Source
UART Rx
0
0
0
0
Timer 1
Timer 1
1
0
0
0
Timer 2
Timer 1
0
1
0
0
Timer 1
Timer 2
1
1
0
0
Timer 2
Timer 2
X
0
1
0
INT_BRG
Timer 1
X
1
1
0
INT_BRG
Timer 2
0
X
0
1
Timer 1
INT_BRG
1
X
0
1
Timer 2
INT_BRG
X
X
1
1
INT_BRG
INT_BRG
0
1
Overflow
SPD
BDRCON.1
BRG
(8 bits)
BRL
(8 bits)
F
Clk Periph
÷
6
BRR
BDRCON.4
0
1
SMOD1
PCON.7
÷
2
INT_BRG
Baud_Rate =
6(1-SPD) ⋅ 32 ⋅ (256 -BRL)
2SMOD1 ⋅ F
PER
BRL = 256 -
6(1-SPD) ⋅ 32 ⋅ Baud_Rate
2SMOD1 ⋅ F
PER



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