Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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### 8085 Microprocessor Assembly Language Programming The 8085 microprocessor assembly language is a low-level programming language used to program the 8085 microprocessor. Below is a step-by-step guide to designing a program that performs specific tasks using the 8085 assembly language. #### Program Tasks: 1. **Initialize register A with a value of 0xFF.** 2. **Load a 16-bit value from memory location 2000H into register pair HL.** 3. **Subtract the value in register B from the value in register A.** 4. **Store the result in memory location 3000H.** 5. **If the result is negative, jump to memory location 4000H.** ### Steps Explained: 1. **Initialize Register A:** - The first step is to initialize the accumulator (register A) with the hexadecimal value 0xFF. ```assembly MVI A, 0xFF ; Move immediate value 0xFF into register A ``` 2. **Load 16-bit Value into HL Register Pair:** - Load the 16-bit value from memory location 2000H into the HL register pair. ```assembly LHLD 2000H ; Load the contents of memory location 2000H into HL register pair ``` 3. **Subtract Value in B from A:** - Subtract the value in register B from the value in register A. ```assembly SUB B ; Subtract the contents of B from A ``` 4. **Store the Result in Memory:** - Store the result of the subtraction operation in memory location 3000H. ```assembly STA 3000H ; Store the contents of A into memory location 3000H ``` 5. **Conditional Jump if Result is Negative:** - Check if the result of the subtraction is negative and if true, jump to memory location 4000H. ```assembly JM 4000H ; Jump to 4000H if the result is negative ``` ### Complete Program: ```assembly MVI A, 0xFF ; Initialize register A with 0xFF LHLD 2000H ; Load 16-bit value from memory location 2000H into HL pair SUB B ; Sub
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Transcribed Image Text:### 8085 Microprocessor Assembly Language Programming The 8085 microprocessor assembly language is a low-level programming language used to program the 8085 microprocessor. Below is a step-by-step guide to designing a program that performs specific tasks using the 8085 assembly language. #### Program Tasks: 1. **Initialize register A with a value of 0xFF.** 2. **Load a 16-bit value from memory location 2000H into register pair HL.** 3. **Subtract the value in register B from the value in register A.** 4. **Store the result in memory location 3000H.** 5. **If the result is negative, jump to memory location 4000H.** ### Steps Explained: 1. **Initialize Register A:** - The first step is to initialize the accumulator (register A) with the hexadecimal value 0xFF. ```assembly MVI A, 0xFF ; Move immediate value 0xFF into register A ``` 2. **Load 16-bit Value into HL Register Pair:** - Load the 16-bit value from memory location 2000H into the HL register pair. ```assembly LHLD 2000H ; Load the contents of memory location 2000H into HL register pair ``` 3. **Subtract Value in B from A:** - Subtract the value in register B from the value in register A. ```assembly SUB B ; Subtract the contents of B from A ``` 4. **Store the Result in Memory:** - Store the result of the subtraction operation in memory location 3000H. ```assembly STA 3000H ; Store the contents of A into memory location 3000H ``` 5. **Conditional Jump if Result is Negative:** - Check if the result of the subtraction is negative and if true, jump to memory location 4000H. ```assembly JM 4000H ; Jump to 4000H if the result is negative ``` ### Complete Program: ```assembly MVI A, 0xFF ; Initialize register A with 0xFF LHLD 2000H ; Load 16-bit value from memory location 2000H into HL pair SUB B ; Sub
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