Reading: "HC05 Understanding Small Microcontrollers" Pages 17-26, 30-36

6805 Microcontroller - general model fits von Neumann architecture

• program memory
• data memory
• address bus and data bus
• inputs/outputs - microcontroller inputs/outputs tend to be simple
• clock
• cpu

Microcontrollers most often used in embedded systems

Registers in the 6805 cpu

• A - accumulator
• X - index register
• SP - stack pointer
• PC - program counter
• CCR - condition code register

Assembly language programming

• instruction set
• opcode  and operands
• mnemonic
• assembler
• machine code
• hex notation

Example instructions

• Assembler directives - org, fdb, equ
• 6805 instructions - lda, ldx, mul, dec, bne