Описание
All PICmicro microcontrollers employ an advanced RISC architecture. PIC16F8X devices have enhanced core features, eight-level deep stack, and multiple internal and external interrupt sources. The separate instruction and data buses of the Harvard architecture allow a 14-bit wide instruction word with a separate 8-bit wide data bus. The two stage instruction pipeline allows all instructions to execute in a single cycle, except for program branches (which require two cycles). A total of 35 instructions (reduced instruction set) are available. Additionally, a large register set is used to achieve a very high performance level. PIC16F84 microcontrollers typically achieve a 2:1 code compression and up to a 4:1 speed improvement (at 20 MHz) over other 8-bit microcontrollers in their class.
- Only 35 single word instructions to learn
- All instructions single cycle except for program branches which are two-cycle
- Operating speed: DC – 10 MHz clock input DC – 400 ns instruction cycle
- 14-bit wide instructions
- 8-bit wide data path
- 15 special function hardware registers
- Eight-level deep hardware stack
- Direct, indirect and relative addressing modes
- Four interrupt sources: – External RB0/INT pin – TMR0 timer overflow – PORTB<7:4> interrupt on change – Data EEPROM write complete
- 1000 erase/write cycles Flash program memory
- 10,000,000 erase/write cycles EEPROM data memory
- EEPROM Data Retention > 40 years Peripheral Features:
- 13 I/O pins with individual direction control
- High current sink/source for direct LED drive – 25 mA sink max. per pin – 20 mA source max. per pin
- TMR0: 8-bit timer/counter with 8-bit programmable prescaler Pin Diagrams Special Microcontroller Features:
- In-Circuit Serial Programming (ICSP™) – via two pins (ROM devices support only Data EEPROM programming)
- Power-on Reset (POR)
- Power-up Timer (PWRT)
- Oscillator Start-up Timer (OST)
- Watchdog Timer (WDT) with its own on-chip RC oscillator for reliable operation
- Code-protection
- Power saving SLEEP mode
- Selectable oscillator options CMOS Flash/EEPROM Technology:
- Low-power, high-speed technology
- Fully static design
- Wide operating voltage range: – Commercial: 2.0V to 6.0V – Industrial: 2.0V to 6.0V
- Low power consumption: – < 2 mA typical @ 5V, 4 MHz - 15 µA typical @ 2V, 32 kHz - < 1 µA typical standby current @ 2V
