HCS12 CPU Architecture Explained – Registers + Step-by-Step Assembly Execution

In this video, we break down the HCS12 CPU architecture by exploring its five key registers: 1️⃣ Accumulator (A, B, D) – ALU's workspace for arithmetic operations 2️⃣ Program Counter (PC) – Points to the next instruction 3️⃣ Index Registers (X, Y) – Used for indexed addressing / arrays 4️⃣ Stack Pointer (SP) – Manages the LIFO stack 5️⃣ Condition Code Register (CCR) – Status flags for conditional branching Then we put it all into practice with a real assembly program: LDS #$2000 LDAA #$25 ADDA #$34 ADDA #$11 ADDA #18 ADDA #%00001110 STAA Sum Watch as the Program Counter auto-increments, the Accumulator updates step-by-step, and the result gets stored in memory at $1000. 🔔 Subscribe for more computer engineering tutorials! ⏱️ TIMESTAMPS: 0:00 – Introduction 0:30 – What is CPU Architecture? 1:15 – Accumulator (A, B, D) 1:45 – Program Counter (PC) 2:15 – Index Registers (X, Y) 2:45 – Stack Pointer (SP) 3:05 – Condition Code Register (CCR) 4:55 – Assembly Example Overview 5:25 – Machine Code & Memory Content 12:30 – Accumulator A Content After Each Instruction 18:37 – What's Next? #HCS12 #CPUArchitecture #ComputerEngineering #AssemblyLanguage #Microcontrollers #Registers #programmingquestions Related Videos: Hex to Binary:    • Hex to Binary Conversion Tutorial - Step b...   Binary to Hex:    • Binary to Hexadecimal Conversion Tutorial ...   #HCS12 #CPUArchitecture #ComputerEngineering #AssemblyLanguage #Microcontrollers #Registers #ECE3731 #EmbeddedSystems