Lecture 6.pptx - Microcontroller Architecture PIC18F Family...

Microcontroller Architecture
PIC18F Family

PIC18F Microcontroller
Families
 Microcontroller Unit (MCU)

Microprocessor unit (MPU)

Harvard Architecture

Program memory for instructions

Data memory for data

I/O ports

Support devices such as timers, ADC
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Microcontroller Unit
3

PIC18F – MPU and Memory
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Microprocessor Unit
 Includes Arithmetic Logic Unit (ALU),
Registers, and Control Unit

Arithmetic Logic Unit (ALU)

Instruction decoder

16-bit instructions

Status register that stores flags

5-bits

WREG – Working Register

8-bit accumulator
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Microprocessor Unit

Registers

Program Counter (PC)

21-bit register that holds the Program Memory
Address

Bank Select Register (BSR)

4-bit register used in direct addressing the Data
Memory

File Select Registers (FSRs)

12-bit registers used as memory pointers in indirect
addressing Data Memory

Control unit

Provides timing and control signals

Read and Write operations
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