Unit 2 L10 | RIM instruction | Read Interrupt Mask| RIM IN 8085 MICROPROCESSOR | Pending Interrupt
Summary
TLDRThis video script delves into the concept of RIM (Read Interrupt Mask) and FRIM (Frame Read Interrupt Mask) instructions, focusing on their use in reading the status of interrupts in a microprocessor. It explains the one-byte instruction format and clarifies the functions of the RIM, including identifying pending interrupts, displaying the status of the interrupt enable flag, and determining whether interrupts are enabled or disabled. The script also distinguishes between pending and masked interrupts, providing insights into the microprocessor's interrupt management.
Takeaways
- 📝 The video discusses the difference between 'rim' and 'frame' instruction in a computer program.
- 🔢 'One byte instruction' refers to a program instruction that uses one memory location for its execution.
- 📡 'RIM' stands for Read Interrupt Mask, and it is used to read the status of interrupts.
- 👉 The RIM instruction can identify pending interrupts, which are activated but not yet served by the microprocessor.
- 🔢 Bit positions in the RIM instruction (D0 to D7) represent different interrupt statuses, with specific bits indicating the status of particular interrupts.
- 🚫 If the D5 bit is set to one, it indicates that the interrupt at position 6.5 is in a pending condition.
- 🛑 Bit D3, or I4, shows the interrupt enable flag status, determining if interrupts are enabled (1) or disabled (0).
- 🔄 M7.5, M6.5, and M5.5 represent the masked interrupt status, showing whether an interrupt is masked (1) or unmasked (0).
- 🔄 D4 to D6 in the RIM instruction show the status of interrupts as pending or not.
- 🔄 The term 'masked interrupt' refers to an interrupt that is currently not being processed by the system due to its status in the RIM instruction.
- 🤔 The video ends with a prompt for the difference between pending interrupts, but does not provide the answer within the transcript.
Q & A
What is the main topic of the video?
-The main topic of the video is to discuss the difference between RIM (Register Instruction Memory) and Frame Instruction.
What does 'one byte instruction' mean in the context of the video?
-In the context of the video, 'one byte instruction' refers to an instruction that occupies one memory location and is used for executing program commands.
What is the purpose of the RIM instruction?
-The purpose of the RIM instruction is to read the status of interrupts, which helps in identifying pending interrupts and managing them accordingly.
How many bits are used to identify pending interrupts in the RIM instruction?
-Eight bits are used to identify pending interrupts in the RIM instruction, with each bit corresponding to a specific interrupt status.
What does the bit number 'D3' represent in the RIM instruction?
-In the RIM instruction, bit number 'D3' represents the interrupt enable flag status, indicating whether interrupts are enabled (1) or disabled (0).
What is the significance of the bits D4 to D6 in the RIM instruction?
-Bits D4 to D6 in the RIM instruction show the status of the interrupt enable flag, indicating whether the respective interrupts are enabled or disabled.
What does the term 'masked interrupt' refer to in the video?
-A 'masked interrupt' refers to an interrupt that has been disabled or prevented from being recognized by the microprocessor due to the corresponding bit being set to one.
How can you determine if an interrupt is pending based on the RIM instruction?
-You can determine if an interrupt is pending by checking the corresponding bit in the RIM instruction; if the bit is set to one, the interrupt is pending.
What is the difference between a pending interrupt and a masked interrupt?
-A pending interrupt is one that has occurred but has not yet been serviced by the microprocessor, while a masked interrupt is one that has been disabled and will not be recognized by the microprocessor.
How can you tell if the interrupts are enabled or disabled in the RIM instruction?
-You can tell if the interrupts are enabled or disabled by checking the value of the interrupt enable flag (D3) in the RIM instruction; a value of 1 means interrupts are enabled, and a value of 0 means they are disabled.
What does the term 'serial input data' refer to in the context of the RIM instruction?
-In the context of the RIM instruction, 'serial input data' refers to the process of receiving data in a sequential manner, one bit at a time, which is indicated by the bits D4 to D6.
Outlines
🧠 Understanding RIM and EMR Instructions
This paragraph introduces the concept of RIM (Read Interrupt Mask) and EMR (Enable Mask Register) instructions in programming. It explains that these are one-byte instructions used to manage interrupt statuses. The RIM instruction is specifically used to read the status of interrupts, identifying which interrupts are pending and which are not. The EMR instruction, on the other hand, is used to enable or disable interrupts. The paragraph delves into the bit-wise representation of these instructions, highlighting the functions of bits such as D3 (interrupt enable flag), D5 (pending interrupt status), and the masking of interrupts (D0 to D2). It also discusses the implications of these bits being set to 1 or 0, indicating whether interrupts are enabled, pending, or masked.
🔍 Exploring the Details of Interrupt Status and Masking
The second paragraph continues the discussion on interrupts, focusing on the status and masking of interrupts. It explains that the RIM instruction can read the status of multiple interrupts at once, identifying which are pending. The EMR instruction is used to enable or disable these interrupts. The paragraph further clarifies the role of bits D4 to D6 in showing the status of interrupts and the interrupt enable flag (D7.5, D6.5, D5.5). It also discusses the concept of masked interrupts, where bits D0 to D2 indicate whether an interrupt is masked (1) or unmasked (0). The paragraph ends by prompting a question about the difference between pending interrupts, inviting further exploration or clarification.
Mindmap
Keywords
💡RIM (Register Instruction Memory)
💡Instruction
💡Interrupt
💡Pending Interrupts
💡Status
💡Enable
💡Masked Interrupt
💡Serial Input Data
💡Bit
💡Memory Location
💡Flag
Highlights
The video discusses the difference between RIM and frame instruction.
One byte instruction means using one memory location for execution.
RIM is used to read the status of interrupts.
Interrupt status can be identified using bits D0 to D7.
7.5 I6.5 I5.5 shows the pending status of RST 7.5, RST 6.5, and RSD 5.5 interrupts respectively.
If D5 bit is 1, RST 6.5 is in a pending condition.
D3 (I4) shows the interrupt enable flag status.
A value of 1 for I4 means interrupts are enabled, while 0 means they are not.
M7.5, M6.5, and M5.5 show the status of interrupts - pending or not.
T (I7.5 6.5 5.5) indicates the interrupt enable flag.
A value of 1 for T means interrupts are enabled, while 0 means they are disabled.
Bits D4 to D6 show the status of masked interrupts.
If a bit is 1, the corresponding interrupt is masked. If 0, it is unmasked.
The video will explain the difference between pending and masked interrupts.
RIM instruction helps in identifying and managing interrupt statuses in a microprocessor.
Understanding RIM is crucial for effective interrupt handling in programming.
The video provides a clear explanation of RIM and its functions in interrupt management.
Transcripts
[Music]
in this video i will discuss
about rim instruction frame instruction
is basically
difference i will discuss in the end of
this video
okay after explaining the rim to rim
is the instruction emr instruction
first of all one byte instruction what
one byte instruction means key
okay if we write this instruction in a
program
to escape execution the kidney location
used to be one memory location
used and what is the function of rim
rim as
means basically rim is used to
read the status of interrupts means key
read the status of interruption
zero one two three four five six seven
you can write d
not d one d seven like this
identify pending interrupts
pending
at a time more than one interrupts are
activated to microprocessor served
and
7.5 i 6.5 i 5.5
shows the spending status of rst 7.5
rst 6.5 rsd 5.5 respectively
value
if i six point five means key if d5 bit
is one means e rst six point
five is in pending condition six point
five is
pending interrupts clear now bit number
d3
what is the function of d3 d3 ie
i4 interrupt e for enable
this is show the interrupt enable
flag status if this value is equal
to one means key interrupts are enabled
if this value is equal to zero
interrupts are
not enabled now third function
third function two
okay again m seven point five for
uh rst seven point five m six point five
for
rsd six point five or m five point five
four
rst five point five t is
sid for receiving serial input data
i 7.5 6.5 5.5 means
d4 to d6 show the status of interrupts
his interrupts are pending or not
pending t
i e is the interrupt enable flag if this
value
is 1 means key interrupts are enabled
this value is zero means key interrupts
are disabled
m seven point five six point five or
five point five
or you can say bit d0 to d2
shows the status of masked interrupt
means if any bit is one then particular
interrupt
is masked or if bit is zero the
respective interrupt is unmasked
now what is the difference between so
pending interrupts
thank you
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