Lab Microcontrollers

LAB Work: 1. Read the instructions below and update the memory fields and the status register SR as necessary a. MOV W8, W14 After Instruction Before Instruction b. W8 9852 W8 W14 2500 W14 SR 0000 SR W2 AD32 W2 Data 14F0 ABF0 Data 14F0 SR 0000 SR MOV AD32 AD32 0000 #0x4EF0, W11 After Instruction W11 ABEF W11 4EF0 SR 0000 SR 0000 MOV.B W2, W5 After Instruction Before Instruction e. 0000 After Instruction Before Instruction d. 9852 W2, 0x14F0 MOV Before Instruction c. 9852 W2 8208 W2 W5 FD13 W5 SR 0000 SR MOV 8208 FD08 0000 [W4], [W9] Before Instruction After Instruction f. W4 1400 W4 W9 1402 W9 1400 1524 1400 1402 AF17 1402 SR 0000 SR 1400 1402 1524 1524 0000 ADD.B W9, #15, W13 Dec to hex: 15=0x000F Carry: W9: 11 22F1 +000F =0100 After Instruction Before Instruction W9 22F1 W9 W13 A2C0 W13 SR 0000 SR 22F1 A200 DC:1 N:0 OV:0 Z:1 C:1 0103 g. ADD.B W4, W5, W6 Carry: W4: AB50 W5 +AB50 = A0 After Instruction Before Instruction W4 AB50 W4 W5 AB50 W5 W6 EEFF W6 AB50 AB50 EEA0 SR 0000 SR DC:0 N:1 OV:1 Z:0 C:0 000C h. ADD W4, W5, W6 Carry: W4: AB50 W5 +0050 =ABA0 After Instruction Before Instruction W4 AB50 W4 W5 0050 W5 W6 EEFF W6 SR 0000 SR AB50 0050 ABA0 DC:0 N:1 OV:0 Z:0 C:0 0008 i. INC.B 0x1020 11 70FF +0001 00 After Instruction Before Instruction Data 1020 SR 70FF 0000 Data 1029 SR 7000 DC:1 N:0 OV:0 Z:1 C:1 0103 j. INC W1, W12 1 AD6F +0001 AD70 After Instruction Before Instruction W1 AD6F W1 W12 2000 W12 SR 0000 SR AD6F AD70 DC:1 N:1 OV:0 Z:0 C:0 0108 k. POP 0x1200 After Instruction Before Instruction l. 2000 W15 Data 1FFE 4000 Data 1FFE 4000 Data 1200 BF23 Data 1200 4000 SR 0000 SR 0000 PUSH 0x1200 After Instruction Before Instruction 2. 1FFE W15 W15 2000 W15 Data 2000 4000 Data 2000 Data 1200 BF23 Data 1200 SR 0000 SR Find the Machine Code for the instructions < a= and < b= a) MOV W8, W14 2002 4000 4000 0000 0111 1www wBhh hddd dggg ssss 0111 1000 0000 0111 0000 1000 Machine code: 0x780708 b) MOV W2, 0x14F0 Hex to binary: 0x14F0 = 0001 0100 1111 0000 1000 1fff ffff ffff ffff ssss 1000 1000 1010 0111 1000 0010 Machine code: 0x88A782 3. Write the Following Assembly Code. Trace the Program Memory and Verify your Answers. .text .global reset reset: mov #0x0000, W1 W0 W1 W2 f SR -- 0x0000 -- -- 0000 mov.b #2047, W1 -- 0x00FF -- -- 0000 0x00FF 0x00FF -- -- 0000 mov #255, W0 add W1, W0, W1 mov W1, W2 mov.b W2, 0x1300 0x00FF 0x01FE -- -- DC:1 N:0 OV:0 Z:0 C:0 0100 0x00FF 0x01FE 0x01FE -- 0100 0x00FF 0x01FE 0x01FE 0x00FE 0100 inc.b 0x1300 0x00FF 0x01FE 0x01FE 0x00FF 0x00FF 0x01FE 0x01FE 0x0000 inc.b 0x1300 done: goto done DC:0 N:1 OV:0 Z:0 C:0 0008 DC:1 N:0 OV:0 Z:1 C:1 0103 Conclusion In conclusion, in this lab we have studied many sorts of assembly instructions and addressing modes with their varied types in this lab. File register to file register, memory to file register, and # to file register are a few of the addressing modes that we have learned and applied in the lab. Moving forward, we also learned about the application of various instructions, including MOV, INC, ADD, POP, and PUSH; and some of them, like ADD.B, MOV.B, and INC.B, that contain a bit operation. We also learned how to translate from assembly language to machine code. Additionally, we learned about the various flags, including DC, N, OV, Z, and C. This has helped us understand the 16-bit STATUS register and how it maintains status information for the instructions which have been executed most recently. In the second part of the lab, we became familiar with PIC24F MCU Digital Input/Output Ports. And we learned to how to interface the Digital Input with Digital Outputs in PIC24F. Our role was to program and interface the PIC24F MCU using C programming language with MPLAB. Additionally, we wrote simple C language programs for interfacing switches with LCD. This part of the lab helped us familiarize ourselves with the process of downloading and debugging programs on a PIC24 microcontroller using ICD 3.