AT83C51RB2-3CSCM 查看數據表（PDF） - Atmel Corporation

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AT83C51RB2-3CSCM

80C51 High Performance ROM 8-bit Microcontroller

Atmel Corporation 

AT80C51RD2/AT83C51Rx2

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

Peripheral clock

BRR

auto reload counter overflow

/2

/6

0

BRG

1

BRL

SPD

0

INT_BRG

1

• The baud rate for UART is token by formula:

BaudRate = -2----×-----2-----×-----6----〈-2--1--S--M-–----OS---P-D---D--×---〉-F---×-C---1-L---6K---P--×--E--[-R--2-I--5P---6-H----–-----(--B----R----L----)---]

(BRL) = 256 – 2-----×-----2-----×2----S-6-M--(--1-O---–-D---S1---P--×-D---F-)---×C----L-1--K-6--P---×-E---R-B--I--aP---u-H--d----R----a---t--e-

39

4113B–8051–03/05

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