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參數(shù)資料
| 型號(hào)： | VMX51C900 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Versa Mix 8051 MCU with LCD Controller and ADC |
| 中文描述： | 8051反之亦然混合與LCD控制器和ADC的微控制器 |
| 文件頁數(shù)： | 24/55頁 |
| 文件大?。?/td> | 2395K |
| 代理商： | VMX51C900 |
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VMX51C900
______________________________________________________________________________________________
www.ramtron.com
page 24 of 55
UART Operation in Mode 3
In Mode 3, 11 bits are transmitted (through TXD) or
received (through RXD). The transactions are
composed of: a Start bit (Low), 8 data bits (LSB first), a
programmable 9
th
data bit, and one Stop bit (High).
Mode 3 is identical to Mode 2 in all respects but one:
the baud rate. Either Timer 1 or Timer 2 generates the
baud rate in Mode 3.
F
IGURE
15:
S
ERIAL
P
ORT
M
ODE
3
B
LOCK
D
IAGRAM
UART in Mode 2 and 3: Additional Information
As mentioned previously, for an operation in Modes 2
and 3, 11 bits are transmitted (through TXD) or
received (through RXD). The signal comprises: a
logical low Start bit, 8 data bits (LSB first), a
programmable 9
th
data bit, and one logical high Stop
bit.
On transmit, (TB8 in SCON) can be assigned the value
of 0 or 1. On receive; the 9
th
data bit goes into RB8 in
SCON. The baud rate is programmable to either 1/32
or 1/64 the oscillator frequency in Mode 2. Mode 3 may
have a variable baud rate generated from either Timer
1 or Timer 2 depending on the states of TCLK and
RCLK.
UART Transmission in Mode 2 and Mode 3
The transmission is initiated by any instruction that
makes use of SBUF as the destination register. The 9
th
bit position of the transmit shift register is loaded by the
“write to SBUF” signal. This event also informs the
UART transmission control unit that a transmission has
been requested. After the next rollover in the divide-by-
16 counter, a transmission actually starts at the
beginning of the machine cycle. It follows that the bit
times are synchronized to the divide-by-16 counter and
not to the “write to SBUF” signal, as in the previous
mode.
Transmissions begin when the SEND signal is
activated, which places the Start bit on TXD pin. Data
is activated one bit time later. This activation enables
the output bit of the transmit shift register to the TXD
pin. The first shift pulse occurs one bit time after that.
The first shift clocks a Stop bit (1) into the 9
th
bit
position of the shift register on TXD. Thereafter, only
zeros are clocked in. Thus, as data bits shift out to the
right, zeros are clocked in from the left. When TB8 is at
the output position of the shift register, the stop bit is
just to the left of TB8, and all positions to the left of that
contain zeros. This condition signals to the TX control
unit to shift one more time and set TI, while
deactivating SEND. This occurs at the 11
th
divide-by-
16 rollover after “write to SBUF”.
Internal Bus
SBUF
D
S
Q
ZERO DETECTOR
CLK
1
Write to
SBUF
TX Control Unit
Start
TX Clock
Data
Send
RX Control Unit
RI
TI
RX Clock
Start
SHIFT
9-Bit Shift Register
SBUF
Internal Bus
READ SBUF
LOAD SBUF
Serial Port
Interrupt
Shift
Bit
Detector
÷16
÷16
1-0 Transition
Detector
RXD
÷2
Timer 2
Overflow
Timer 1
Overflow
RCLK
TCLK
SMOD
0
1
0
1
0
1
Load
SBUF
Shift
TXD
SAMPLE
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VMX51C900-25-L | 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| VMX51C900-25-LG | 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| VMX51C900-25-L-G | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Versa Mix 8051 MCU with LCD Controller and ADC |
| VMX51C900-25-P | 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| VMX51C900-25-PG | 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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