8051 Serial Port - gmitWEB
8051 Serial Port - gmitWEB
8051 Serial Port - gmitWEB
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<strong>Serial</strong> Output Pin Expansion<br />
• P1.0 will clear the shift register outputs when brought low<br />
• 8 output pins generated from 3 <strong>8051</strong> pins<br />
– Connect Q7 of 74LS164 to the data input of a second 74LS164 to generate 15<br />
outputs from 3 <strong>8051</strong> pins<br />
<strong>8051</strong><br />
74LS164<br />
P1.0<br />
RXD<br />
TXD<br />
MR<br />
DIN<br />
CLK<br />
Q0<br />
Q1<br />
Q2<br />
Q3<br />
Q4<br />
Q5<br />
Q6<br />
Q7<br />
8 Output<br />
<strong>Port</strong>s<br />
Embedded Systems 1 5-16 <strong>8051</strong> Peripherals
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