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(yè)數(shù)： 25/55頁(yè)
文件大?。?/td> 2395K
代理商： VMX51C900
VMX51C900
______________________________________________________________________________________________
www.ramtron.com
page 25 of 55
UART Reception in Mode 2 and Mode 3
One to zero transitions on the RXD pin initiate
reception. It is for this reason that RXD is sampled at a
rate of 16 multiplied by the baud rate that has been
established.
When a transition is detected, the 1FFh is written into
the input shift register and the divide-by-16 counter is
immediately reset.
During the 7
th
, 8
th
and 9
th
counter states of each bit
time; the bit detector samples the value of RXD. The
accepted value is the value that was seen in at least
two of the three samples. If the value accepted during
the first bit time is not zero, the receive circuits are
reset and the unit goes back to searching for another
one to zero transition. If the start bit is valid, it is shifted
into the input shift register, and the reception of the
rest of the frame will proceed.
For a receive operation, the data bits come in from the
right as 1’s shift out on the left. As soon as the start bit
arrives at the leftmost position in the shift register (9-bit
register), it tells the RX control block to do one more
shift, to set RI, and to load SBUF and RB8. The signal
to set RI and to load SBUF and RB8 will be generated
if, and only if, the following conditions are satisfied at
the instance when the final shift pulse is generated:
-
Either SM2 = 0 or the received 9
th
bit equal 1
-
RI = 0
If both conditions are met, the 9
th
data bit received
goes into RB8, and the first 8 data bits go into SBUF. If
one of these conditions is not met, the received frame
is completely lost. One bit time later, whether the
above conditions are met or not, the unit goes back to
searching for a one to zero transition at the RXD input.
Please note that the value of the received stop bit is
unrelated to SBUF, RB8 or RI.
UART Baud Rates
In Mode 0, the baud rate is fixed and is represented by
the following formula:
In Mode 2, the baud rate depends on the value of the
SMOD bit in the PCON SFR. From the formula below,
we can see that if SMOD = 0 (which is the value on
reset), the baud rate is 1/32 the oscillator frequency.
The Timer 1 and/or Timer 2 overflow rate determines
the baud rates in modes 1 and 3.
Generating UART Baud Rate with Timer 1
When Timer 1 functions as a baud rate generator, the
baud rate in modes 1 and 3 are determined by the
Timer 1 overflow rate.
Timer 1 must be configured as an 8-bit timer (TL1) with
auto-reload with TH1 value when an overflow occurs
(Mode 2). In this application, the Timer 1 interrupt
should be disabled.
The following two formulas can be used to calculate
the baud rate and the reload value to be written into
the TH1 register.
Mode 0 Baud Rate = Oscillator Frequency
12
Mode 2 Baud Rate = 2
SMOD
x (Oscillator Frequency)
64
Mode 1,3 Baud Rate =
2
SMOD
x Fosc
32 x 12(256 – TH1)
Mode 1,3 Baud Rate = 2
SMOD
x Timer 1 Overflow Rate
32
相關(guān)PDF資料
PDF描述
VN0104 N-Channel Enhancement-Mode Vertical DMOS FET(擊穿電壓40V,N溝道增強(qiáng)型垂直DMOS結(jié)構(gòu)場(chǎng)效應(yīng)管)
VN0104 N-Channel Enhancement-Mode Vertical DMOS FET
VN0104N3 N-Channel Enhancement-Mode Vertical DMOS FET
VN0109NE N-Channel Enhancement-Mode Vertical DMOS Power FETs Quad Array
VN0116ND TRANSISTOR | MOSFET | N-CHANNEL | 160V V(BR)DSS | CHIP
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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*