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AT80C51RB2-3CSIM データシート(PDF) 38 Page - ATMEL Corporation

部品番号 AT80C51RB2-3CSIM
部品情報  80C51 High Performance ROM 8-bit Microcontroller
PDF  83 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT80C51RB2-3CSIM データシート(HTML) 38 Page - ATMEL Corporation

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39
AT80C51RD2/AT83C51Rx2
4113B–8051–03/05
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 18. Internal Baud Rate
•
The baud rate for UART is token by formula:
Peripheral clock
BRG
0
1
/6
BRL
/2
0
1
INT_BRG
BRR
auto reload counter
overflow
SPD
BaudRate
2SMOD FCLKPERIPH
×
22
6
×
×
1
SPD
–
〈〉 16
×
256
BRL
()
–
[]
×
----------------------------------------------------------------------------------------------------------
=
BRL
()
256
2SMOD1 FCLKPERIPH
×
22
6
×
×
1
SPD
–
()
16
×
BaudRate
×
-----------------------------------------------------------------------------------------
–
=



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