Consider the following statements regarding 8051 Architecture:
1. 8051 has 4KB on-chip program memory (standard version).
2. Internal RAM is 128 bytes.
3. External memory can be interfaced.
Which of the above statements is/are correct?
Answer & step-by-step solution
The classic 8051 is an 8-bit Harvard-style microcontroller with separate code and data spaces. The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority. Key relation: Reset SP=07H; classic internal RAM=128 bytes; standard ROM=4 KB.
Exam focus: Remember 07H for stack pointer reset. Common trap: 00H is not the reset value of the 8051 stack pointer.
Statement-wise Verification
- Statement 1 - Correct.
8051 has 4KB on-chip program memory (standard version).
The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority. - Statement 2 - Correct.
Internal RAM is 128 bytes.
The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority. - Statement 3 - Correct.
External memory can be interfaced.
The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority.
Core Concept
The classic 8051 is an 8-bit Harvard-style microcontroller with separate code and data spaces. The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority. On reset the stack pointer is 07H, so the first PUSH stores at 08H.
Formula / Key Relationship
Reset SP=07H; classic internal RAM=128 bytes; standard ROM=4 KB.
Why the Other Options Are Wrong
Option B is incorrect because it omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 2. Option D is incorrect because it omits correct statement(s) 3.
Exam Shortcut / Approach
Remember 07H for stack pointer reset.
Common Mistake
00H is not the reset value of the 8051 stack pointer.
Quick Revision
Internal and External Memory is linked with Memory Architecture, 8051 Microcontroller and Microprocessors and Microcontrollers. Remember 07H for stack pointer reset.
8051 आर्किटेक्चर के संबंध में निम्नलिखित कथनों पर विचार कीजिए:
1. 8051 में 4KB ऑन-चिप प्रोग्राम मेमोरी (मानक संस्करण) होती है।
2. आंतरिक RAM 128 बाइट है।
3. बाहरी मेमोरी इंटरफ़ेस की जा सकती है।
उपरोक्त में से कौन-सा/से कथन सही है/हैं?
उत्तर और चरणबद्ध हल
A — उपरोक्त सभी। मानक 8051 में 4 KB ऑन-चिप प्रोग्राम ROM, 128 बाइट आंतरिक RAM है और यह बाहरी कोड/डेटा मेमोरी (64 KB तक) को सपोर्ट करता है।
विस्तृत हल (मूल भाषा में)
Statement-wise Verification
- Statement 1 - Correct.
8051 has 4KB on-chip program memory (standard version).
The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority. - Statement 2 - Correct.
Internal RAM is 128 bytes.
The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority. - Statement 3 - Correct.
External memory can be interfaced.
The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority.
Core Concept
The classic 8051 is an 8-bit Harvard-style microcontroller with separate code and data spaces. The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority. On reset the stack pointer is 07H, so the first PUSH stores at 08H.
Formula / Key Relationship
Reset SP=07H; classic internal RAM=128 bytes; standard ROM=4 KB.
Why the Other Options Are Wrong
Option B is incorrect because it omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 2. Option D is incorrect because it omits correct statement(s) 3.
Exam Shortcut / Approach
Remember 07H for stack pointer reset.
Common Mistake
00H is not the reset value of the 8051 stack pointer.
Quick Revision
Internal and External Memory is linked with Memory Architecture, 8051 Microcontroller and Microprocessors and Microcontrollers. Remember 07H for stack pointer reset.
8051 આર્કિટેક્ચર અંગે નીચેનાં વિધાનો ધ્યાનમાં લો:
1. 8051માં 4KB ઓન-ચિપ પ્રોગ્રામ મેમરી (પ્રમાણભૂત આવૃત્તિ) હોય છે.
2. આંતરિક RAM 128 બાઇટ છે.
3. બાહ્ય મેમરી ઇન્ટરફેસ કરી શકાય છે.
ઉપરોક્તમાંથી કયું/કયાં વિધાન સાચું/સાચાં છે?
જવાબ અને પગલાવાર ઉકેલ
A — ઉપરોક્ત તમામ. પ્રમાણભૂત 8051માં 4 KB ઓન-ચિપ પ્રોગ્રામ ROM, 128 બાઇટ આંતરિક RAM છે અને તે બાહ્ય કોડ/ડેટા મેમરી (64 KB સુધી)ને સપોર્ટ કરે છે.
વિગતવાર ઉકેલ (મૂળ ભાષામાં)
Statement-wise Verification
- Statement 1 - Correct.
8051 has 4KB on-chip program memory (standard version).
The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority. - Statement 2 - Correct.
Internal RAM is 128 bytes.
The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority. - Statement 3 - Correct.
External memory can be interfaced.
The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority.
Core Concept
The classic 8051 is an 8-bit Harvard-style microcontroller with separate code and data spaces. The standard core has 4 KB on-chip program ROM and 128 bytes internal RAM, supports external memory, multiple interrupts and configurable interrupt priority. On reset the stack pointer is 07H, so the first PUSH stores at 08H.
Formula / Key Relationship
Reset SP=07H; classic internal RAM=128 bytes; standard ROM=4 KB.
Why the Other Options Are Wrong
Option B is incorrect because it omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 2. Option D is incorrect because it omits correct statement(s) 3.
Exam Shortcut / Approach
Remember 07H for stack pointer reset.
Common Mistake
00H is not the reset value of the 8051 stack pointer.
Quick Revision
Internal and External Memory is linked with Memory Architecture, 8051 Microcontroller and Microprocessors and Microcontrollers. Remember 07H for stack pointer reset.
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