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AT89C51ED2-RDTIM Fiches technique(PDF) 53 Page - ATMEL Corporation

No de pièce AT89C51ED2-RDTIM
Description  8-bit Flash Microcontroller
PDF  137 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTIM Fiches technique(HTML) 53 Page - ATMEL Corporation

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53
AT89C51RD2/ED2
4235E–8051–04/04
Table 32. Baud Rate Selection Table UART
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 26. 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
0000
Timer 1
Timer 1
1000
Timer 2
Timer 1
0100
Timer 1
Timer 2
1100
Timer 2
Timer 2
X
010
INT_BRG
Timer 1
X
110
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
BRG
0
1
/6
BRL
/2
0
1
INT_BRG
SPD
BRR
SMOD1
auto reload counter
overflow
FPER
Baud_Rate =
6(1-SPD)
⋅ 32 ⋅ (256 -BRL)
2SMOD1
⋅ F
PER
BRL = 256 -
6(1-SPD)
⋅ 32 ⋅ Baud_Rate
2
SMOD1
⋅ F
PER



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