8051 Serial Port - gmitWEB

More documents

Recommendations

Info

Serial Input Pin Expansion • P1.0 will load the register parallel inputs when brought low • 8 input pins generated from 3 8051 pins – Connect data output pin of a second 74LS165 to the data input pin of another to generate 16 inputs from 3 8051 pins 74LS165 8 Input Ports QA QB QC QD QE QF QG QH INHIB OUT CLK LOAD 8051 RXD TXD P1.0 INPUT Embedded Systems 1 5-18 8051 Peripherals
Multi-Processor Communication • Modes 2 and 3 can be configured to allow serial communication between a master 8051 and a number of slave 8051s – The TXD pin of the master connects to the RXD pin of the slave 8051s – In modes 2 and 3 a 9 th data bit is transmitted • This bit is received into the RB8 bit of the SCON register • If the SM2 bit of SCON is set, the RI flag will only be set when a serial frame is received with the 9 th bit = ‘1’ • This 9 th bit can be set/cleared to specify an address/data frame TXD Master 8051 RXD RXD RXD Slave 8051 #1 Slave 8051 #2 ………….. Slave 8051 #n Embedded Systems 1 5-19 8051 Peripherals
Page 1 and 2: 8051 Serial Port • The 8051 conta
Page 3 and 4: Serial Port Modes • Mode 0 - Only
Page 5 and 6: Data Transmission/Reception • The
Page 7 and 8: Configuring the Serial Port • Con
Page 9 and 10: Common Baud Rates Embedded Systems
Page 11 and 12: Serial Program Example 2 ; Program
Page 13 and 14: Serial Program Example 3 (cont) ;lo
Page 15 and 16: Serial I/O Expansion • A 74LS164
Page 17: Serial Input Pin Expansion • A 74

8051 Serial Port - gmitWEB

Create successful ePaper yourself

Delete template?

Save as template?