参数资料
| 型号： | SCC2692AC1N28,602 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 29/30页 |
| 文件大小： | 0K |
| 描述： | IC DUART 28-DIP |
| 标准包装： | 13 |
| 特点： | 故障启动位检测 |
| 通道数： | 2，DUART |
| FIFO's： | 3 位 |
| 电源电压： | 5V |
| 带并行端口： | 是 |
| 带自动流量控制功能： | 是 |
| 带故障启动位检测功能： | 是 |
| 带CMOS： | 是 |
| 安装类型： | 通孔 |
| 封装/外壳： | 28-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 28-DIP |
| 包装： | 管件 |
| 其它名称： | 568-8368-5 933981720602 SCC2692AC1N28 SCC2692AC1N28,602-ND SCC2692AC1N28-ND |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页当前第29页第30页
Philips Semiconductors
Product specification
SCC2692
Dual asynchronous receiver/transmitter (DUART)
1998 Sep 04
8
BLOCK DIAGRAM
The SCC2692 DUART consists of the following eight major sections:
data bus buffer, operation control, interrupt control, timing,
communications Channels A and B, input port and output port. Refer
to the Block Diagram.
Data Bus Buffer
The data bus buffer provides the interface between the external and
internal data buses. It is controlled by the operation control block to
allow read and write operations to take place between the controlling
CPU and the DUART.
Operation Control
The operation control logic receives operation commands from the
CPU and generates appropriate signals to internal sections to
control device operation. It contains address decoding and read and
write circuits to permit communications with the microprocessor via
the data bus buffer.
Interrupt Control
A single active-Low interrupt output (INTRN) is provided which is
activated upon the occurrence of any of eight internal events.
Associated with the interrupt system are the Interrupt Mask Register
(IMR) and the Interrupt Status Register (ISR). The IMR can be
programmed to select only certain conditions to cause INTRN to be
asserted. The ISR can be read by the CPU to determine all currently
active interrupting conditions.
Outputs OP3-OP7 can be programmed to provide discrete interrupt
outputs for the transmitter, receivers, and counter/timer.
TIMING CIRCUITS
Crystal Clock
The timing block consists of a crystal oscillator, a baud rate
generator, a programmable 16-bit counter/timer, and four clock
selectors. The crystal oscillator operates directly from a crystal
connected across the X1/CLK and X2 inputs. If an external clock of
the appropriate frequency is available, it may be connected to
X1/CLK. The clock serves as the basic timing reference for the Baud
Rate Generator (BRG), the counter/timer, and other internal circuits.
A clock signal within the limits specified in the specifications section
of this data sheet must always be supplied to the DUART.
If an external clock is used instead of a crystal, X1 should be driven
using a configuration similar to the one in Figure 7.
BRG
The baud rate generator operates from the oscillator or external
clock input and is capable of generating 23 commonly used data
communications baud rates ranging from 50 to 130.4K baud. A
3.6864MHz crystal or external clock must be used to get the
standard baud rate. The clock outputs from the BRG are at 16X the
actual baud rate. The counter/timer can be used as a timer to
produce a 16X clock for any other baud rate by counting down the
crystal clock or an external clock. The four clock selectors allow the
independent selection, for each receiver and transmitter, of any of
these baud rates or external timing signal.
Counter/Timer (C/T)
The counter timer is a 16 bit programmable divider that operates
one of three modes: Counter, Timer or Time Out mode. In all three
modes it uses the 16-bit value loaded to the CTUR and CTLR
registers. (Counter timer upper and lower preset registers).
In the timer mode it generates a square wave.
In the counter mode it generates a time delay.
In the time out mode it monitors the receiver data flow and signals
data flow has paused. In the time out mode the receiver controls
the starting/stopping of the C/T.
The counter operates as a down counter and sets its output bit in
the ISR (Interrupt Status Register) each time it passes through 0.
The output of the counter/timer may be seen on one of the OP pins
or as an Rx or Tx clock.
The Timer/Counter is controlled with six (6) “commands”; Start C/T,
Stop C/T, write C/T, preset registers, read C/T value, set or reset
time out mode.
Please see the detail of the commands under the Counter/Timer
register descriptions.
Communications Channels A and B
Each communications channel of the SCC2692 comprises a
full-duplex asynchronous receiver/transmitter (UART). The operating
frequency for each receiver and transmitter can be selected
independently from the baud rate generator, the counter/timer, or
from an external input.
The transmitter accepts parallel data from the CPU, converts it to a
serial bit stream, inserts the appropriate start, stop, and optional
parity bits and outputs a composite serial stream of data on the TxD
output pin. The receiver accepts serial data on the RxD pin,
converts this serial input to parallel format, checks for start bit, stop
bit, parity bit (if any), or break condition and sends an assembled
character to the CPU.
Input Port
The inputs to this unlatched 7-bit port can be read by the CPU by
performing a read operation at address H’D’. A High input results in
a logic 1 while a Low input results in a logic 0. D7 will always read
as a logic 1. The pins of this port can also serve as auxiliary inputs
to certain portions of the DUART logic.
Four change-of-state detectors are provided which are associated
with inputs IP3, IP2, IP1 and IP0. A High-to-Low or Low-to-High
transition of these inputs, lasting longer than 25 - 50
s, will set the
corresponding bit in the input port change register. The bits are
cleared when the register is read by the CPU. Any change-of-state
can also be programmed to generate an interrupt to the CPU.
The input port pulse detection circuitry uses a 38.4KHz sampling
clock derived from one of the baud rate generator taps. This results
in a sampling period of slightly more than 25
s (this assumes that
the clock input is 3.6864MHz). The detection circuitry, in order to
guarantee that a true change in level has occurred, requires two
successive samples at the new logic level be observed. As a
consequence, the minimum duration of the signal change is 25
s if
the transition occurs “coincident with the first sample pulse”. The
50
s time refers to the situation in which the change-of-state is “just
missed” and the first change-of-state is not detected until 25
s later.
All the IP pins have a small pull-up device that will source 1 to 4
mA
of current from VCC. These pins do not require pull-up devices or
VCC connections if they are not used.
Output Port
The output port pins may be controlled by the OPR, OPCR, MR and
CR registers. Via appropriate programming they may be just another
parallel port to external circuits, or they may represent many internal
相关PDF资料 |
PDF描述 |
|---|---|
| SCC2698BC1A84,512 | IC UART OCTAL ENHANCED 84-PLCC |
| SCC68681C1N40,112 | IC DUART 40DIP |
| SCC68692C1A44,529 | IC DUART 44PLCC |
| SCF5250LAG100 | IC MPU COLDFIRE 100MHZ 144-LQFP |
| SDC1740-411B | IC CONV SYNCHRO-DGTL 12B 32-DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SCC2692AC1N28-S | 功能描述:UART 接口集成电路 5V INDSTRL UART 2 C RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| SCC2692AC1N40 | 制造商:NXP Semiconductors 功能描述:IC DUART 2692 DIP40 制造商:NXP Semiconductors 功能描述:IC, DUART, 2692, DIP40 制造商:NXP Semiconductors 功能描述:IC, DUAL UART, FIFO, 115KBAUD 5.5V DIP40; No. of Channels:2; Data Rate:1Mbps; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; Digital IC Case Style:DIP; No. of Pins:40; Operating Temperature Min:0C; Operating Temperature Max:70C ;RoHS Compliant: Yes |
| SCC2692AC1N40,602 | 功能描述:UART 接口集成电路 2CH. 5V IND. UART RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| SCC2692AC1N40602 | 制造商:NXP Semiconductors 功能描述:IC DUAL UART FIFO 1MBPS 5.5V DIP-40 |
| SCC2692AE1A44 | 功能描述:UART 接口集成电路 5V INDSTRL UART 2 C RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。