8251A UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER

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Presentation transcript:

8251A UNIVERSAL SYNCHRONOUS ASYNCHRONOUS RECEIVER TRANSMITTER As a peripheral device of a microcomputer system, the 82C51A-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.

Pin Diagram

Control Words There are two types of control word Mode instruction (setting of function) 2. Command (setting of operation)

Mode Instruction 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)

Command Command is used for setting the operation Items to be set by command are as follows: • Transmit Enable/Disable • Receive Enable/Disable • DTR, RTS Output of data. • Resetting of error flag. • Sending to break characters • Internal resetting • Hunt mode (synchronous mode)

Standby Status When the following conditions have been satisfied the MSM82C51A-2 is in “standby status.” (1) CS terminal is fixed at Vcc level. (2) Input pins other CS , D0 to D7, RD, WR and C/D are fixed at Vcc or GND level (including SYNDET in external synchronous mode).