The Read/Write Control logic interfaces the 8251A with CPU, determines the functions of the 8251A according to the control word written into its control register.
It monitors the data flow.
This section has three registers and they are control register, status register and data buffer.
The active low signals RD, WR, CS and C/D(Low) are used for read/write operations with these three registers.
When C/D(low) is high, the control register is selected for writing control word or reading status word.
When C/D(low) is low, the data buffer is selected for read/write operation.
When the reset is high, it forces 8251A into the idle mode.
The clock input is necessary for 8251A for communication with CPU and this clock does not control either the serial transmission or the reception rate.ThesisScientist.com
PIC A special purpose integrated circuit that function as an overall manager in an interrupt driven system.
It accepts request from the peripheral equipment,determines which of the incoming request is of the highest priority, ascertains whether the incoming request has a higher priority value than the level currently being serviced, and issues an interrupt to the CPU based on this determination.
found this one in one of my abandoned folders. AC(students from JUCSE need no introduction but for others you should never want to know him :-O) assigned this task to me and 3 of my fellow classmates to create a presentation on this uninteresting and weird topic. We pulled it off however :P
This presentation discusses the hardware details of 8051 microcontroller, viz. the pin description, reset circuit, port architectures, oscillator circuit and machine cycle etc in 8051
The Read/Write Control logic interfaces the 8251A with CPU, determines the functions of the 8251A according to the control word written into its control register.
It monitors the data flow.
This section has three registers and they are control register, status register and data buffer.
The active low signals RD, WR, CS and C/D(Low) are used for read/write operations with these three registers.
When C/D(low) is high, the control register is selected for writing control word or reading status word.
When C/D(low) is low, the data buffer is selected for read/write operation.
When the reset is high, it forces 8251A into the idle mode.
The clock input is necessary for 8251A for communication with CPU and this clock does not control either the serial transmission or the reception rate.ThesisScientist.com
PIC A special purpose integrated circuit that function as an overall manager in an interrupt driven system.
It accepts request from the peripheral equipment,determines which of the incoming request is of the highest priority, ascertains whether the incoming request has a higher priority value than the level currently being serviced, and issues an interrupt to the CPU based on this determination.
found this one in one of my abandoned folders. AC(students from JUCSE need no introduction but for others you should never want to know him :-O) assigned this task to me and 3 of my fellow classmates to create a presentation on this uninteresting and weird topic. We pulled it off however :P
This presentation discusses the hardware details of 8051 microcontroller, viz. the pin description, reset circuit, port architectures, oscillator circuit and machine cycle etc in 8051
The microprocessor is the central processing unit of a computer. It is the heart of the computer. 8085 is one of the most popular 8-Bit microprocessors in India. Because of its unique characteristics of both industry and academics still regarded as standard this microprocessor.
This presentation by Morris Kleiner (University of Minnesota), was made during the discussion “Competition and Regulation in Professions and Occupations” held at the Working Party No. 2 on Competition and Regulation on 10 June 2024. More papers and presentations on the topic can be found out at oe.cd/crps.
This presentation was uploaded with the author’s consent.
0x01 - Newton's Third Law: Static vs. Dynamic AbusersOWASP Beja
f you offer a service on the web, odds are that someone will abuse it. Be it an API, a SaaS, a PaaS, or even a static website, someone somewhere will try to figure out a way to use it to their own needs. In this talk we'll compare measures that are effective against static attackers and how to battle a dynamic attacker who adapts to your counter-measures.
About the Speaker
===============
Diogo Sousa, Engineering Manager @ Canonical
An opinionated individual with an interest in cryptography and its intersection with secure software development.
Have you ever wondered how search works while visiting an e-commerce site, internal website, or searching through other types of online resources? Look no further than this informative session on the ways that taxonomies help end-users navigate the internet! Hear from taxonomists and other information professionals who have first-hand experience creating and working with taxonomies that aid in navigation, search, and discovery across a range of disciplines.
Acorn Recovery: Restore IT infra within minutesIP ServerOne
Introducing Acorn Recovery as a Service, a simple, fast, and secure managed disaster recovery (DRaaS) by IP ServerOne. A DR solution that helps restore your IT infra within minutes.
Sharpen existing tools or get a new toolbox? Contemporary cluster initiatives...Orkestra
UIIN Conference, Madrid, 27-29 May 2024
James Wilson, Orkestra and Deusto Business School
Emily Wise, Lund University
Madeline Smith, The Glasgow School of Art
2. FEATURES OF 8085
• It is an 8 bit processor
• It is a single chip N-MOS device with 40 pins.
• It has 8 bit Data Bus.
• It has a 16 bit Address Bus.
• It works on 5 Volt DC power supply
• The maximum clock frequency is 3 MHz while minimum frequency is 500 KHz.
4. CLOCK SIGNALS
X1, X2
• A crystal is connected at these two pins and
is used to set frequency of the internal clock
generator. This frequency is internally divided
by 2.
CLK OUT
• This signal is used as the system clock for
devices connected with the microprocessor.
5. SERIAL I/O SIGNALS
SID
• (Serial Input Data line)
• The data on this line is loaded into
accumulator whenever a RIM instruction
is executed.
SOD
• (Serial Output Data line)
• The output SOD is set/reset as specified by the
SIM instruction.
6. INTERRUPT SIGNALS
TRAP
• TRAP is usually used for power failure and emergency shutoff.
RST 7.5
• It is a maskable interrupt. It has the second highest priority.
RST 6.5
• It is a maskable interrupt. It has the third highest priority.
RST 5.5
• It is a maskable interrupt. It has the fourth highest priority.
INTR
• It is a general purpose interrupt. It is a maskable interrupt. It has the
lowest priority.
7. DATA BUS
• Data bus is of 8 Bit.
• It is used to transfer data between
microprocessor and memory.
• AD0 – AD7. It carries the least significant
8-bit address and data bus.
8. ADDRESS BUS
• These pins carry the higher order of
address bus.
• The address is sent from microprocessor
to memory.
• A8 – A15. It carries the most significant 8-
bit of memory I/O address.
9. EXTERNALLY INITIATED
SIGNALS
INTA
• It is an interrupt acknowledgment signal.
RESET IN
• This signal is used to reset the microprocessor
by setting the program counter to zero.
RESET OUT
• This signal is used to reset all the connected
devices when the microprocessor is reset.
10. EXTERNALLY INITIATED
SIGNALS
Ready
• This signal indicates that the device is ready to
send or receive data. If READY is low, then the
CPU has to wait for READY to go high.
HOLD
• This signal indicates that another master is
requesting the use of the address and data buses.
HLDA
• It indicates that the CPU has received the HOLD
request and it will relinquish the bus in the next
clock
11. CONTROL SIGNALS
RD
• This signal indicates that the selected IO
or memory device is to be read and is
ready for accepting data available on the
data bus.
WR
• This signal indicates that the data on the
data bus is to be written into a selected
memory or IO location.
12. STATUS SIGNALS
IO/M
• This signal is used to differentiate
between IO and Memory operations,
i.e. when it is high indicates IO
operation and when it is low then it
indicates memory operation.
S0 & S1
• These signals are used to identify the
type of current operation.
13. POWER SUPPLY
here are 2 power Supply signals:
VCC
• VCC indicates +5v power supply.
VSS
• VSS indicates ground signal.
