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AT89C5122D-RDRUM датащи(PDF) 131 Page - ATMEL Corporation

номер детали AT89C5122D-RDRUM
подробное описание детали  C51 Microcontroller with USB and Smart Card Reader Interfaces
PDF  208 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C5122D-RDRUM датащи(HTML) 131 Page - ATMEL Corporation

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AT83R5122, AT8xC5122/23
4202F–SCR–07/2008
Baud Rate Selection
(Modes 1 and 3)
In modes 1 and 3, the Baud Rate is derived either from the Timer 1 or the Internal Baud
Rate Generator and allows different baud rate in reception and transmission.
As shown in Figure 78 the selection is done using RBCK and TBCK bits in BDRCON
register.
Figure 79 gives the baud rate calculation formulas for each baud rate source while
Table 76 details Internal Baud Rate Generator configuration for different peripheral
clock frequencies and giving baud rates closer to the standard baud rates.
Figure 78.
Baud Rate Source Selection (Modes 1 and 3)
Figure 79.
Baud Rate Formulas (Modes 1 and 3)
0
1
RBCK
BDRCON.2
T1
CLOCK
To serial
IBRG
CLOCK
reception Port
0
1
TBCK
BDRCON.3
T1
CLOCK
To serial
IBRG
CLOCK
transmission Port
/ 16
/ 16
Baud_Rate =
6
(1-SPD)
⋅ 32 ⋅ (256 -BRL)
2
SMOD1 ⋅ F
CK_SI
BRL = 256 -
6(1-SPD)
⋅ 32 ⋅ Baud_Rate
2SMOD1
⋅ F
CK_SI
Baud_Rate =
192
⋅ (256 -TH1)
2SMOD1
⋅ F
CK_T1
TH1 = 256 -
192
⋅ Baud_Rate
2
SMOD1 ⋅ F
CK_T1
a. IBRG Formula
b. T1 Formula



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