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| 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(yè)數(shù)： | 96/143頁(yè) |
| 文件大?。?/td> | 1050K |
| 代理商： | SDA5250-2 |
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SDA 525x
Semiconductor Group
96
1998-04-08
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.
As data bits shift out to the right, zeros are clocked in from the left. When the MSB of the
data byte is at the output position of the shift register, then the 1 that was initially loaded
into the 9th position is just left of the MSB, 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 10th 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 1 FF
into the input shift register. Resetting the divide-by-16 counter aligns its rollovers with the
boundaries of the incoming bit times.
The 16 states of the counter divide each bit time into 16ths. 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. This is done for noise
rejection. 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. This is to provide
rejection of false start bits. 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 mode 1 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 stop bit = 1
If either of these two conditions is not met, the received frame is irretrievably lost. If both
conditions are met, the stop bit goes into RB8, the 8 data bits go into SBUF and Rl is
activated. At this time, no matter whether the above conditions are met or not, the unit
goes back looking for a 1-to-0-transition in RxD.
H
is written
6.3.10.5
11 bits are transmitted (through TxD), or received (through RxD): a start bit (0), 8 data
bits (LSB first), a programmable 9th data bit, and a stop bit, (1). On transmission, the 9th
data bit (TB8) can be assigned the value of 0 or 1. On reception, the 9th data bit goes
into RB8 in SCON.
More about Modes 2 and 3
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| SDA5251-2 | ICs for Consumer Electronics |
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相關(guān)代理商/技術(shù)參數(shù) |
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| 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 |
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