參數(shù)資料
型號: VMX1C1020
廠商: Electronic Theatre Controls, Inc.
英文描述: Versa Mix 8051 Mixed-Signal MCU
中文描述: 反之亦然混合8051混合信號微控制器
文件頁數(shù): 38/80頁
文件大小: 3605K
代理商: VMX1C1020
VMX51C1020
_________________________________________________________________________________________________
www.ramtron.com
page 38 of 80
UART0 - Mode 0
In this Mode, pin RX0 is used as an input and an
output, while TX0 is used only to output the shift
clock. For an operation in this mode, 8 bits are
transmitted with the LSB as the first bit.
Additionally, the baud rate is fixed at 1/12 of the
crystal oscillator frequency. In order to initialize
reception in this mode, the user must set bits
R0I and R0EN in the S0CON register to 0 and 1,
respectively. Note that in other Modes, when
R0EN=1, the interface begins to receive data.
UART0 - Mode 1
In this Mode, the RX0 pin serves as an input and
the TX0 pin as a serial output and no external
shift clock is used. In Mode 0, 10-bits are
transmitted:
o
Start bit (logic low);
o
8-bits of data (LSB first);
o
A stop bit (logic high).
The start bit synchronizes data reception, with
the 8-bits of received data then being available
in the S0BUF register. Reception is completed
once the stop bit sets the R0B8 flag in the
S0CON register.
UART0 - Mode 2
In this Mode the RX0 pin is used as an input and
an output while TX0 is used to output the shift
clock.
In
Mode
transmitted/received. hese 11-bits consist of:
o
Start bit (logic low)
o
8 bits of data (LSB first),
o
One programmable 9
th
bit,
o
Stop bit (logic high).
The 9
th
bit is used for parity. In the data
transmission case, bit TB80 of the S0CON is
output as the 9
th
bit. For reception, the 9
th
bit will
be stored captured in the RB80 bit of the
S0CON register.
2,
11
bits
are
UART0 - Mode 3
Mode 3 is essentially identical to Mode 2, with
the difference being that the internal baud rate
generator or Timer1 can be used to set the
baud rate.
UART0 - Baud Rate Generator Source
As mentioned previously, the UART0 baud rate
clock can be sourced from either Timer 1 or the
dedicated 10-bit baud rate generator.
Selection between these sources is enabled via
the BAUDSRC bit of the U0BAUD register (see
following table).
T
ABLE
64:
(U0BAUD)
UART0
B
AUD RATE SOURCE SELECT
-
SFR
D8
H
7
6
5
4
BAUDSRC
-
-
-
7
BAUDSRC
Baud rate generator clock source
0 = Timer 1
1 = Use UART0 dedicated Baud
rate generator
6:0
-
-
3
-
2
-
1
-
0
-
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