- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372130 > SCN2651CC1N28 (NXP SEMICONDUCTORS) Programmable communications interface PCI PDF資料下載
參數(shù)資料
| 型號(hào)： | SCN2651CC1N28 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Programmable communications interface PCI |
| 中文描述： | 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 118K |
| 代理商： | SCN2651CC1N28 |
Philips Semiconductors
Product specification
SCN2651
Programmable communications interface (PCI)
1994 Apr 27
4
PIN DESCRIPTION
Pin No.
27, 28, 1, 2, 5-8
Symbol
D0 – D
7
RESET
A
0
–A
1
R/W
CE
DSR
DTR
RTS
CTS
DCD
TxEMT/DSCHG
TxC
RxC
TxD
RxD
TxRDY
RxRDY
BRCLK
V
CC
GND
Name and Function
Type
I/O
I
I
I
I
I
O
O
I
I
O
I/O
I/O
O
I
O
O
I
I
I
8-Bit data bus
Reset
Internal register select lines
Read or write command
Chip enable input
Data set ready
Data terminal ready
Request to send
Clear to send
Data carrier detected
Transmitter empty or data set change
Transmitter clock
Receiver clock
Transmitter data
Receiver data
Transmitter ready
Receiver ready
Baud rate generator clock
+5V supply
Ground
21
12, 10
13
11
22
24
23
17
16
18
9
25
19
3
15
14
20
26
4
Table 1.
Baud Rate Generator Characteristics
Crystal Frequency = 5.0688MHz
Theoretical
Frequency
16X Clock
16X Clock
0.8kHz
0.8kHz
1.2
1.2
1.76
1.76
2.152
2.1523
2.4
2.4
4.8
4.8
9.6
9.6
19.2
19.2
28.8
28.8
32.0
32.081
38.4
38.4
NOTE:
*Error at 19200 can be reduced to zero by using crystal
frequency 4.9152MHz. 16X clock is used in asynchronous mode.
In synchronous mode, clock multiplier is 1X.
Baud
Rate
Actual
Frequency
Percent
Error
Divisor
50
75
110
134.5
150
300
600
1200
1800
2000
2400
–
–
–
6336
4224
2880
2355
2112
1056
528
264
176
158
132
0.016
–
–
–
–
–
0.253
–
BLOCK DIAGRAM
The PCI consists of six major sections. These are the transmitter,
receiver, timing, operation control, modem control and SYN/DLE
control. These sections communicate with each other via an
internal data bus and an internal control bus. The internal data bus
interfaces to the microprocessor data bus via a data bus buffer.
Operation Control
This functional block stores configuration and operation commands
from the CPU and generates appropriate signals to various internal
sections to control the overall device operation. It contains read and
write circuits to permit communications with the microprocessor via
the data bus and contains mode registers 1 and 2, the command
register, and the status register. Details of register addressing and
protocol are presented in the PCI programming section of this data
sheet.
Timing
The PCI contains a baud rate generator (BRG) which is
programmable to accept external transmit or receive clocks or to
divide an external clock to perform data communications. The unit
can generate 16 commonly used baud rates, any one of which can
be selected for full-duplex operation. See Table 1.
Receiver
The receiver accepts serial data on the RxD pin, converts this serial
input to parallel format, checks for bits or characters that are unique
to the communication technique and sends an “assembled”
character to the CPU.
Transmitter
The transmitter accepts parallel data from the CPU, converts it to a
serial bit stream, inserts the appropriate characters or bits (based on
the communication technique) and outputs a composite serial
stream of data on the TxD output pin.
Modem Control
The modem control section provides interfacing for three input
signals and three output signals used for “handshaking” and status
indication between the CPU and a modem.
SYN/DLE Control
This section contains control circuitry and three 8-bit registers
storing the SYN1, SYN2, and DLE characters provided by the CPU.
These registers are used in the synchronous mode of operation to
provide the characters required for synchronization, idle fill and data
transparency.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SCN2652 | Multi-protocol communications controller MPCC |
| SCN2652AC2A44 | NT Series Toggle Switch, 1 pole, 3 position, Solder terminal, Locking Lever |
| SCN2652AC2N40 | Multi-protocol communications controller MPCC |
| SCN68652 | Multi-protocol communications controller MPCC |
| SCN68652AC2A44 | Multi-protocol communications controller MPCC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SCN2652 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multi-protocol communications controller MPCC |
| SCN2652AC1I40 | 制造商:North American Philips Discrete Products Div 功能描述:COMMUNICATIONS INTERFACE, 40 Pin, Ceramic, DIP |
| SCN2652AC1N40 | 制造商:North American Philips Discrete Products Div 功能描述:COMMUNICATIONS INTERFACE, 40 Pin, Plastic, DIP 制造商:NXP Semiconductors 功能描述:COMMUNICATIONS INTERFACE, 40 Pin, Plastic, DIP |
| SCN2652AC2A44 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multi-protocol communications controller MPCC |
| SCN2652AC2F40 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multi-protocol communications controller MPCC |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。