- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄374747 > SDA5250-2 (SIEMENS A G) ICs for Consumer Electronics PDF資料下載
參數(shù)資料
| 型號(hào)： | SDA5250-2 |
| 廠商： | SIEMENS A G |
| 元件分類： | 圖文 |
| 英文描述： | ICs for Consumer Electronics |
| 中文描述： | TELETEXT DECODER, PQCC84 |
| 文件頁數(shù)： | 97/143頁 |
| 文件大?。?/td> | 1050K |
| 代理商： | SDA5250-2 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁當(dāng)前第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁
SDA 525x
Semiconductor Group
97
1998-04-08
Figures 32 and 34
associated timings. The receive portion is exactly the same as in mode 1. The transmit
portion differs from mode 1 only in the 9th bit of the transmit shift register.
Transmission is initiated by any instruction that uses SBUF as a destination register. The
“write-to- SBUF” signal also loads TB8 into the 9th bit position of the transmit shift
register and flags the TX- control unit that a transmission is requested. Transmission
commences at the beginning of the machine cycle following the next rollover in the
divide-by-16 counter (thus, the bit times are synchronized to the divide-by-16 counter,
not to the “write-to-SBUF” signal).
The transmission begins with activation of SEND, which puts the start bit to TxD. One bit
time later, DATA is activated which enables the output bit of the transmit shift register to
TxD. The first shift pulse occurs one bit time after that. The first shift clocks a 1 (the stop
bit) into the 9th bit position of the shift register. 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, then the stop bit is just left of the TB8, and all
positions to the left of that contain zeros.
This condition flags the TX-control unit to do one last shift and then deactivate SEND
and set Tl. This occurs at the 11th divide-by-16 rollover after “write-to-SBUF”.
Reception is initiated by a detected 1-to-0 transition at RxD. For this purpose RxD is
sampled at a rate of 16 times whatever baud rate has been established. When a
transition is detected, the divide-by-16 counter is immediately reset, and 1FF
to the input shift register.
At the 7th, 8th, and 9th counter states of each bit time, the bit detector samples the value
of RxD. The value accepted is the value that was seen in at least 2 of the 3 samples. If
the value accepted during the first bit time is not 0, the receive circuits are reset and the
unit goes back looking for another 1-to-0 transition. If the start bit proves valid, it is shifted
into the input shift register, and reception of the rest of the frame will proceed. As data
bits come in from the right, 1 s shift out to the left. When the start bit arrives at the
leftmost position in the shift register (which in modes 2 and 3 is a 9-bit register), it flags
the RX-control block to do one last shift, load SBUF and RB8, and set Rl. The signal to
load SBUF and RB8, and to set Rl, will be generated if, and only if, the following
conditions are met at the time the final shift pulse is generated:
1. Rl = 0, and
2. either SM2 = 0 or the received 9th data bit = 1
If either of these two conditions is not met, the received frame is irretrievably lost, and Rl
is not set. If both conditions are met, the received 9th data bit goes into RB8, the first 8
data bits go into SBUF. One bit time later, no matter whether the above conditions are
met or not, the unit goes back looking for a 1-to-0-transition at the RxD input.
Note that the value of the received stop bit is irrelevant to SBUF, RB8 or Rl.
show a functional diagram of the serial port in modes 2 and 3 and
H
is written
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SDA5251-2 | ICs for Consumer Electronics |
| SDA5256M-2 | ICs for Consumer Electronics |
| SDA5252-2 | ICs for Consumer Electronics |
| SDA5255-2 | ICs for Consumer Electronics |
| SDA5252 | 8-BIT SINGLE CHIP MICROCONTROLLERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SDA5250M | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5250M-2 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5251 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5251-2 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
| SDA5251M | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Consumer Electronics |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。