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AT89C51ID2-RDTIM 데이터시트(PDF) 57 Page - ATMEL Corporation

부품명 AT89C51ID2-RDTIM
상세설명  8-bit Flash Microcontroller
PDF  159 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ID2-RDTIM 데이터시트(HTML) 57 Page - ATMEL Corporation

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AT89C51ID2
4289A–8051–09/03
Table 36. 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 25. 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
00
00
Timer 1
Timer 1
10
00
Timer 2
Timer 1
01
00
Timer 1
Timer 2
11
00
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
BRG
0
1
/6
BRL
/2
0
1
INT_BRG
SPD
BRR
SMOD1
auto reload counter
overflow
F
PER
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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