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A Level Microcontroller Architecture Instruction Set >Memory< ~ BSF and BCF ~ Call and Return ~ COMF ~ Counting ~ Heater ~ INCF and BTFSC ~ INT0IF ~ LED Matrix ~ Motor ~ Stepper Motor

Microcontroller Memory

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A Level Microcontrollers

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PIC16F88 Architecture

Special Function Registers (SFR) - These are named registers in memory banks 0 and 1
- Interrupt Controller: INTCON
- Status Flags: STATUS
- Program counter: PCL
- I/O Ports: PORTA and PORTB
- Data direction: TRISA and TRISB
General Purpose Registers - without names
- In memory bank 0 these are at address from 0x20 to 0x7F.
- In memory bank 1 these are at address from 0xA0 to 0xFF.
- The 16 registers from 0x70 to 0x7F are duplicated in both memory banks.
ROM
- Read Only Memory
- Non Volatile - retains its data when the power is off.
- Can never be erased so it's useful for chip "firmware",
  the code that allows the chip to be programmed.
RAM
- Random Access Memory
- Volatile - data is lost when the power is off.
- It's used to store temporary data like measurements from sensors.
Flash
- Non volatile memory
- It can be erased and re-programmed
- It's useful for the code and data tables uploaded into the chip by the programmer.

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