cse325_S12_set_9_UART

cse325_S12_set_9_UART - 7/23 Serial Communication UART...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 7/23 Serial Communication: UART Computer Science & Engineering Department Arizona State University Tempe, AZ 85287 Dr. Yann-Hang Lee [email protected] Asynchronous Serial Communication -- UART q Universal asynchronous receiver/transmitter q Transmit bits in a single channel v simplex (one way) v half-duplex (one direction at a time) v full-duplex (two way) q A sequence of bits – packet or character v ASCII code – 7 bits for 128 characters (alphabet, numerical, and control) v fixed length or variable length v Start, stop, and parity bits set 9 -- 2 EIA RS232 q Connection and signal characteristics q Data terminal equipment and data communication equipment q Logic '1' (marking) – -3v to -25v with respect to signal ground q Logic “0” (spacing) – +3v to +25v q Not assigned –between -3v and +3v (a transition region) set 9 -- 3 RS232 (continued) q Flow control (handshaking) signals to avoid buffer overflow or lock-up. q RTS – to prepare the DCE device for accepting transmission q CTS -- to inform the DTE device that transmission may begin q DCD: data carrier detected q DSR: DCE ready q SG: system ground q DTR: DTE ready DTE FEP DB25 DCE MOD DB25 1 FG --------------- 1 FG 2 TX --------------> 2 TX 3 RX <-------------- 3 RX 4 RTS -------------->...
View Full Document

This note was uploaded on 04/06/2012 for the course CSE 325 taught by Professor Ye during the Spring '08 term at ASU.

Page1 / 15

cse325_S12_set_9_UART - 7/23 Serial Communication UART...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online