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AT89C5122DS-RDRUM 数据表(PDF) 129 Page - ATMEL Corporation

部件名 AT89C5122DS-RDRUM
功能描述  C51 Microcontroller with USB and Smart Card Reader Interfaces
PDF  208 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

AT89C5122DS-RDRUM 数据表(HTML) 129 Page - ATMEL Corporation

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AT83R5122, AT8xC5122/23
4202F–SCR–07/2008
Baud Rate Selection (Mode 0)
In mode 0, baud rate can be either fixed or variable.
As shown in Figure 72, the selection is done using M0SRC bit in BDRCON register.
Figure 73 gives the baud rate calculation formulas for each baud rate source.
Figure 72.
Baud Rate Source Selection (Mode 0)
Figure 73.
Baud Rate Formulas (Mode 0)
Asynchronous Modes
(Modes 1, 2 and 3)
The Serial Port has one 8-bit and two 9-bit asynchronous modes of operation. Figure 74
shows the Serial Port block diagram in such asynchronous modes.
Figure 74.
Serial I/O Port Block Diagram (Modes 1, 2 and 3)
Mode 1
Mode 1 is a full-duplex, asynchronous mode. The data frame (see Figure 75) consists of
10 bits: one start, eight data bits and one stop bit. Serial data is transmitted on the TXD
pin and received on the RXD pin. When a data is received, the stop bit is read in the
RB8 bit in SCON register.
0
1
M0SRC
BDRCON.0
CK_
SI
/ 6
To Serial Port
IBRG
CLOCK
Baud_Rate =
6(1-SPD)
⋅ 32 ⋅ (256 -BRL)
2SMOD1
⋅ F
CK_SI
BRL = 256 -
6(1-SPD)
⋅ 32 ⋅ Baud_Rate
2SMOD1
⋅ F
CK_SI
a. Fixed Formula
b. Variable Formula
Baud_Rate =
6
F
CK_SI
TB8
SCON.3
IBRG
CLOCK
RXD
TXD
SBUF Tx SR
Rx SR
SM1
SCON.6
SM0
SCON.7
Mode Decoder
M3 M2 M1 M0
RI
SCON.0
TI
SCON.1
Mode & Clock
Controller
SBUF Rx
RB8
SCON.2
SM2
SCON.4
T1
CLOCK
CK_
SI



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