Embedded Systems - Introduction to Microprocessors - MSP430

Explore the microcomputer structure by examining the three fundamental hardware elements—CPU, memory (data and program memory), and input/output systems—and how system buses connect them for basic computing.

Compare microprocessor units and microcontroller units, showing MPUs rely on external memory and peripherals while MCUs embed memory, peripherals, and a CPU on a single chip in MSP430-based systems.

This video contrasts the hardware model and programmers model, showing how system programmers must consider hardware peripherals, memory interfacing, timing, and the instruction set, addressing modes, and memory map transfers.

Study the control unit as a finite state machine with fetch, decode, and execute states that form the instruction cycle, guided by the program counter and bus interface logic.

Explore how the arithmetic logic unit performs arithmetic and logic operations, including addition, subtraction, complement, and bitwise functions, under the control unit, handling operands and results with width considerations.

Explain how bus interface logic coordinates interaction between internal CPU buses and system buses, and defines how external address, control, and data buses operate across memory, CPU, and I/O.

Explore general purpose and special purpose registers as the cpu's temporary storage for data and control information, highlighting the instruction register, program counter, and stack pointer in MSP430.

Learn how status registers, or flag registers, hold zero, carry, negative, overflow, and interrupt flags to reflect ALU outcomes and guide the control unit after execution.

Explore flags in the status register, including zero, carry, negative, and overflow, as you analyze eight-bit additions and determine each flag for operations a–d.

Explore the MSP430 basic hardware, featuring a 16-bit CPU and 16 registers (R0–R15). Identify program counter, stack pointer, and status register with carry, negative, zero, and overflow flags.

Explore the data bus as part of system buses in a microcontroller, showing how it carries data and instructions bidirectionally between memory, CPU, and peripherals through read and write transactions.

Explore address buses, unidirectional lines from CPU to memory or peripherals, and how the address bus width defines the largest addressable memory, using hexadecimal notation and binary-to-hex conversion.

This lecture presents two address bus examples, showing 12-bit and 22-bit ranges from 0x000 to 0xFFF and 0x3fffff, and explains that 32 kb needs 15 address lines.

Explore the control bus as the final bus type, explaining how its individual, unidirectional signals govern read/write operations, synchronize transfers, and request CPU services to regulate system activity.

this lecture introduces addressing modes in MSP430, explains source and destination operands, and outlines four addressing modes plus double and single operand formats in assembly language.

Explore register mode, an addressing mode that uses one or two CPU registers as source or destination, with word or byte operations indicated by dot w or dot b.

Set up Code Composer Studio, create an MSP430 assembly project, and debug on a launchpad while practicing register mode with moves between R5 and R7 and observing the program counter.

Explore indexed addressing on the MSP430, forming an operand address by adding a constant offset to a register, with R5 examples for source or destination byte transfers.

Master indirect register mode, a source-only addressing method that uses an edge symbol to treat a register's content as a memory address, contrasting with direct register mode and index mode.

Demonstrate hands-on programming of indirect register mode in MSP430, using R5 and R6 to copy the memory content addressed by R5, following an immediate addressing example.

Explore indirect autoincrement mode in MSP430 with code composer studio. Load value into R5, fetch address, copy to R6, and auto-increment by two for words and by one for bytes.

Learn how the MSP430 uses constant generator registers R2 and R3 to supply common values for addressing and how emulated instructions, built from these constants, expand the native instruction set.

Analyze the MSP430 instruction anatomy, detailing 16-bit layouts for two-operand and single-operand formats. Learn how opcodes, registers, addressing modes, and byte/word flags govern jumps and program flow.

Explore addition instructions in the MSP430, including add.w, addc.w, and adc.w, with emphasis on source and destination operands, the carry flag, and emulated versus native instructions.

Explore subtraction instructions in MSP430: native sub.w and sub.c.w and the emulated sbc.w, including immediate mode, borrow handling, and carry flag behavior in subtraction.

The lecture shows the cmp.w instruction to compare r5 and r6 by subtracting r5 from r6, updating flags only and not registers, with equal, greater, and less cases.

Explore single-operand emulated arithmetic instructions on MSP430, including clr.w, dec.w, dw, i cw, ai cw, and test.w, and observe their effects on r5 and the zero flag.

Explore logic instructions with two operands in the MSP430, including and, xor, bit test, and bit set or clear, as native operations using source and destination values.

Explore logic instructions with one operand in MSP430, focusing on the inv.w emulated instruction that inverts bits and behaves like a not gate.

Explore byte manipulation in the MSP430 instruction set, including s w p b for swapping bytes in a word and s x t for sign-extending a byte to a word.

Explore manipulating the MSP430 status register flags—carry, negative, and zero—via set and clear instructions, and observe how flag states affect subsequent operations like ADC and decimal carry arithmetic.

Explain endianness in MSP430 by showing how a 16-bit value like 0x2211 is stored across two bytes, with the low byte at the lower memory address, illustrating little-endian memory organization.