|
|
PDF 82C51A Data sheet ( Hoja de datos )
| Número de pieza | 82C51A | |
| Descripción | UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER | |
| Fabricantes | OKI electronic componets | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de 82C51A (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
|
No Preview Available !
E2O0017-27-X2
¡ Semiconductor¡ Semiconductor
MTShMis8v2eCr5si1oAn-:2JRaSn./G19S9/8JS
Previous version: Aug. 1996
MSM82C51A-2RS/GS/JS
UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER
GENERAL DESCRIPTION
The MSM82C51A-2 is a USART (Universal Synchronous Asynchronous Receiver Transmitter)
for serial data communication.
As a peripheral device of a microcomputer system, the MSM82C51A-2 receives parallel data
from the CPU and transmits serial data after conversion. This device also receives serial data
from the outside and transmits parallel data to the CPU after conversion.
The MSM82C51A-2 configures a fully static circuit using silicon gate CMOS technology.
Therefore, it operates on extremely low power at 100 mA (max) of standby current by
suspending all operations.
FEATURES
• Wide power supply voltage range from 3 V to 6 V
• Wide temperature range from –40°C to 85°C
• Synchronous communication upto 64 Kbaud
• Asynchronous communication upto 38.4 Kbaud
• Transmitting/receiving operations under double buffered configuration.
• Error detection (parity, overrun and framing)
• 28-pin Plastic DIP (DIP28-P-600-2.54): (Product name: MSM82C51A-2RS)
• 28-pin Plastic QFJ (QFJ28-P-S450-1.27): (Product name: MSM82C51A-2JS)
• 32-pin Plastic SSOP(SSOP32-P-430-1.00-K): (Product name: MSM82C51A-2GS-K)
1/26
1 page  
¡ Semiconductor
MSM82C51A-2RS/GS/JS
Control Words
There are two types of control word.
1. Mode instruction (setting of function)
2. Command (setting of operation)
1) Mode Instruction
Mode instruction is used for setting the function of the MSM82C51A-2. Mode instruction
will be in “wait for write” at either internal reset or external reset. That is, the writing of a
control word after resetting will be recognized as a “mode instruction.”
Items set by mode instruction are as follows:
• Synchronous/asynchronous mode
• Stop bit length (asynchronous mode)
• Character length
• Parity bit
• Baud rate factor (asynchronous mode)
• Internal/external synchronization (synchronous mode)
• Number of synchronous characters (Synchronous mode)
The bit configuration of mode instruction is shown in Figures 2 and 3. In the case of
synchronous mode, it is necessary to write one-or two byte sync characters.
If sync characters were written, a function will be set because the writing of sync characters
constitutes part of mode instruction.
D7 D6 D5 D4 D3 D2 D1 D0
S1 S1 EP PEN L2 L1 B2 B1
Baud Rate Factor
0101
0
Refer to
Fig. 3
SYNC
0
1¥
11
16 ¥ 64 ¥
0
0
5 bits
Charactor Length
10
01
6 bits 7 bits
1
1
8 bits
0
0
Disable
Parity Check
10
0
Odd
Parity
1
Disable
1
1
Even
Parity
0
0
Inhabit
Stop bit Length
10
01
1 bit 1.5 bits
1
1
2 bits
Fig. 2 Bit Configuration of Mode Instruction (Asynchronous)
5/26
5 Page 
¡ Semiconductor
MSM82C51A-2RS/GS/JS
SYNDET/BD (Input or output terminal)
This is a terminal whose function changes according to mode.
In “internal synchronous mode.” this terminal is at high level, if sync characters are received and
synchronized. If a status word is read, the terminal will be reset.
In “external synchronous mode, “this is an input terminal.
A “High” on this input forces the MSM82C51A-2 to start receiving data characters.
In “asynchronous mode,” this is an output terminal which generates “high level”output upon
the detection of a “break” character if receiver data contains a “low-level” space between the
stop bits of two continuous characters. The terminal will be reset, if RXD is at high level.
After Reset is active, the terminal will be output at low level.
DSR (Input terminal)
This is an input port for MODEM interface. The input status of the terminal can be recognized
by the CPU reading status words.
DTR (Output terminal)
This is an output port for MODEM interface. It is possible to set the status of DTR by a command.
CTS (Input terminal)
This is an input terminal for MODEM interface which is used for controlling a transmit circuit.
The terminal controls data transmission if the device is set in “TX Enable” status by a command.
Data is transmitable if the terminal is at low level.
RTS (Output terminal)
This is an output port for MODEM interface. It is possible to set the status RTS by a command.
11/26
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet 82C51A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| 82C51 | VOLTAGE DETECTORS |  Unisonic Technologies |
| 82C51A | UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER | OKI electronic componets |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |