MSM82C51A-2RS Oki Semiconductor, MSM82C51A-2RS Datasheet

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MSM82C51A-2RS

Manufacturer Part Number
MSM82C51A-2RS
Description
Universal syncnronous asyncnronous receiver tranmitter
Manufacturer
Oki Semiconductor
Datasheet

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E2O0017-27-X2
This version: Jan. 1998
¡ Semiconductor
¡ Semiconductor
MSM82C51A-2RS/GS/JS
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

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MSM82C51A-2RS Summary of contents

Page 1

... 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) This version: Jan ...

Page 2

... Semiconductor FUNCTIONAL BLOCK DIAGRAM RESET CLK C DSR DTR CTS RTS Transmit Data Bus Buffer Buffer ( Transmit Read/Write Control Control Logic Recieve Modem Buffer Control ( Recieve Control MSM82C51A-2RS/GS/JS TXD TXRDY TXE TXC RXD RXRDY RXC SYNDET/BD 2/26 ...

Page 3

... TXD RXD GND TXC C RXRDY MSM82C51A-2RS/GS/ RXC 25 DTR 24 RTS 23 DSR 22 RESET 21 20 CLK 19 TXD TXEMPTY 18 CTS 17 SYNDET/BD 16 TXRDY ...

Page 4

... Status Æ CPU Control Word ¨ CPU Data Æ CPU Data ¨ CPU External Reset Write Mode Instruction yes Asynchronous no Write First Sync Charactor yes Single Sync Mode no Write Second Sync Charactor End of Mode Setting MSM82C51A-2RS/GS/JS 4/26 ...

Page 5

... Fig. 2 Bit Configuration of Mode Instruction (Asynchronous Refer to Fig. 3 SYNC 5 bits Disable Inhabit MSM82C51A-2RS/GS/JS Baud Rate Factor ¥ 16 ¥ 64 ¥ Charactor Length bits 7 bits 8 bits ...

Page 6

... Fig. 3 Bit Configuration of Mode Instruction (Synchronous PEN Charactor Length Parity Disable Synchronous Mode Number of Synchronous Charactors 2 Charactors MSM82C51A-2RS/GS/ bits 6 bits 7 bits 8 bits Odd Even Disable ...

Page 7

... SBRK RXE DTR TXEN Note: Seach mode for synchronous Fig. 4 Bit Configuration of Command MSM82C51A-2RS/GS/JS 0 1ºTransmit Enable 0ºDisable DTR 1 Æ DTR = 0 0 Æ DTR = 1 1ºRecieve Enable 0ºDisable 1ºSent Break Charactor 0ºNormal Operation 1ºReset Error Flag 0ºNormal Operation RTS 1 Æ ...

Page 8

... TXEMPTY RXRDY TXRDY , RD, WR and C/D are fixed at Vcc or GND level (including 7 MSM82C51A-2RS/GS/JS Parity Different from TXRDY Terminal. Refer to "Explanation" of TXRDY Terminals. Same as terminal. Refer to "Explanation" of Terminals. 1ºParity Error 1ºOverrun Error 1ºFraming Error Note: Only asynchronous mode. Stop bit cannot be detected. ...

Page 9

... This is an output terminal for transmitting data from which serial-converted data is sent out. The device is in “mark status” (high level) after resetting or during a status when transmit is disabled also possible to set the device in “break status” (low level command. MSM82C51A-2RS/GS/JS 9/26 ...

Page 10

... This is a clock input signal which determines the transfer speed of received data. In “synchronous mode,” the baud rate is the same as the frequency of RXC. In “asynchronous mode,” possible to select the baud rate factor by mode instruction. It can be 1, 1/16, 1/64 the RXC. MSM82C51A-2RS/GS/JS Timing) 10/26 ...

Page 11

... 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 possible to set the status RTS by a command. MSM82C51A-2RS/GS/JS 11/26 ...

Page 12

... V 2.2 IH Unit Min. Typ. Max. — — 0.45 V 3.7 — — –10 — –10 — 10 — — — — 100 MSM82C51A-2RS/GS/JS Unit Conditions V With respect V to GND V — °C 0 25°C Unit V °C Max. Unit 5 5.5 V +85 °C — +0.8 V — 4 – ...

Page 13

... RD to Data Float Recovery Time between RD Address Stable before WR Address Hold Time for WR WR Pulse Width Data Set-up Time for WR Data Hold Time for WR Recovery Time between WR RESET Pulse Width MSM82C51A-2RS/GS/ 4 –40 to 85°C) CC Symbol Min. Max — ...

Page 14

... TXEMPTY RXDS t 17 RXDH 16¥, 64¥ Baud and for Synchronous Mode MSM82C51A-2RS/GS/ 4 –40 to 85°C) CC Unit Remarks Max. ns — Note 3 ns — — –50 — — — ...

Page 15

... Receiver Clock and Data (RXBAUD Counter starts here) RXD RXC (1 ¥ Mode) 8RXC Periods (16¥Mode) RXC (16 ¥ Mode) INT Sampling Pulse TPD t DTX Start bit t RPD t RPW 16 RXC Periods (16 ¥ Mode MSM82C51A-2RS/GS/ Data bit Data bit 3t CY 15/26 ...

Page 16

... Data Float Don't Care Data Stable Data Float MSM82C51A-2RS/GS/JS t TXRDY Clear Don't Care RXRDY Clear Data Float Data Out Active ...

Page 17

... CHAR2 CHAR1 SYNC CHAR2 CHAR3 CHAR4 PAR PAR PAR PAR PAR MSM82C51A-2RS/GS/JS Wr SBRK DATA CHAR 4 RxEn RxEn Err Res Wr Commond Wr Data SBRK CHAR5 Marking Spacing Marking Data SYNC State ...

Page 18

... Data cannot be received correctly due to a malfunction. ¥64 Data cannot be received correctly due to a malfunction. ¥16 The bit is regarded as a start bit. (normal) ¥64 The bit is regarded as a start bit. (normal) MSM82C51A-2RS/GS/JS (Note Status Rd Status Data Data ...

Page 19

... P: Parity bit Data bits RXRDY signal is outputted during data reception due to a malfunction MSM82C51A-2RS/GS/ ...

Page 20

... parity flag is set, but, no RXRDYsignal is outputted parity flag is set. and a RXRDY signal is outputted. MSM82C51A-2RS/GS/ ≠ ≠ D ...

Page 21

... High-speed device (New) M80C85AH M80C86A-10 M80C88A-10 M82C84A-2 M81C55-5 M82C37B-5 M82C51A-2 M82C53-2 M82C55A-2 Remarks Low-speed device (Old) M80C85A/M80C85A-2 8bit MPU 16bit MPU M80C86A/M80C86A-2 8bit MPU M80C88A/M80C88A-2 Clock generator M82C84A/M82C84A-5 RAM.I/O, timer M81C55 DMA controller M82C37A/M82C37A-5 USART M82C51A Timer M82C53-5 PPI M82C55A-5 MSM82C51A-2RS/GS/JS 21/26 ...

Page 22

... minimum WD t 250 ns minimum minimum f 120 ns minimum maximum CY- MSM82C51A-2RS/GS/JS MSM82C51A-2 +2.5 mA -2.5 mA MSM82C51A-2 130 ns minimum 100 ns maximum 75 ns minimum 100 ns minimum 100 ns minimum 0 ns minimum 160 ns minimum 50 ns minimum 70 ns minimum maximum CY- ...

Page 23

... Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times). MSM82C51A-2RS/GS/JS (Unit : mm) Package material Epoxy resin ...

Page 24

... Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times). MSM82C51A-2RS/GS/JS (Unit : mm) Package material Epoxy resin ...

Page 25

... Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times). MSM82C51A-2RS/GS/JS (Unit : mm) Package material Epoxy resin ...

Page 26

... When the pulldown resistor is greater than 8 kiloohms, use a pulldown resistor of 8 kiloohms or less. Case 3: When an output of the other IC device is connected to the device. The MSM82C84A can be replaced by the MSM82C84A-2 when the I ASYNC pin of the MSM82C84A-2 has an allowance of 100 mA or more. MSM82C51A-2RS/GS/JS pin of the device to drive the OL 26/26 ...

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