Microprocessors and Microcontrollers: Unit IV: (d) Serial Data Transfer (USART) 8251
Interfacing 8251A in I/O Mapped I/O
Serial Data Transfer (USART) 8251
Review Question : 1. Explain with a neat diagram the interfacing of 8251 to 8085 microprocessor.
Interfacing 8251A in I/O Mapped I/O
Fig.
11.8.1 shows the interfacing of 8251 with 8085 in I/O mapped I/O technique.
Here, 
signals are activated by CPU when 
signal is high,
indicating I/O bus cycle.
The
address line Ao is connected to the 
input of the 8251A. The RESET
and CLK signals are driven from the RESETOUT and CLKOUT signals of the 8085,
respectively.
I/O
MAP :
Review Question
1. Explain with a neat
diagram the interfacing of 8251 to 8085 microprocessor.
AU : May-12, Marks 8
Microprocessors and Microcontrollers: Unit IV: (d) Serial Data Transfer (USART) 8251 : Tag: : Serial Data Transfer (USART) 8251 - Interfacing 8251A in I/O Mapped I/O