Description
PIC18F8620 offers the same advantages of all PIC18 microcontrollers – namely, high computational performance at an economical price – with the addition of high endurance Enhanced Flash program memory. The PIC18FXX20 family also provides an enhanced range of program memory options and versatile analog features that make it ideal for complex, high-performance applications. The PIC18FXX20 family introduces the widest range of on-chip, Enhanced Flash program memory available on PICmicro microcontrollers – up to 128 Kbyte (or 65,536 words), the largest ever offered by Microchip. For users with more modest code requirements, the family also includes members with 32 Kbyte or 64 Kbyte Data RAM and Data EEPROM: The PIC18FXX20 family also provides plenty of room for application data. Depending on the device, either 2048 or 3840 bytes of data RAM are available. All devices have 1024 bytes of data EEPROM for long-term retention of nonvolatile data Memory Endurance: The Enhanced Flash cells for both program memory and data EEPROM are rated to last for many thousands of erase/write cycles – up to 100,000 for program memory and 1,000,000 for EEPROM. Data retention without refresh is conservatively estimated to be greater than 40 years. In the event that 128 Kbytes of program memory is inadequate for an application, the PIC18F8X20 members of the family also implement an External Memory Interface. This allows the controller’s internal program counter to address a memory space of up to 2 Mbytes, permitting a level of data access that few 8-bit devices can claim. With the addition of new operating modes, the External Memory Interface offers many new options, including: Operating the microcontroller entirely from external memory Using combinations of on-chip and external memory, up to the 2-Mbyte limit Using external Flash memory for reprogrammable application code, or large data tables Using external RAM devices for storing large amounts of variable data Regardless of the memory size, all devices share the same rich set of peripherals, allowing for a smooth migration path as applications grow and evolve. The consistent pinout scheme used throughout the entire family also aids in migrating to the next larger device. This is true when moving between the 64-pin members, between the 80-pin members, or even jumping from 64-pin to 80-pin devices Communications: The PIC18FXX20 family incorporates a range of serial communications peripherals, including 2 independent USARTs and a Master SSP module, capable of both SPI and I 2C (Master and Slave) modes of operation. For PIC18F8X20 devices, one of the general purpose I/O ports can be reconfigured as an 8-bit Parallel Slave Port for direct processor-to-processor communications CCP Modules: All devices in the family incorporate five Capture/Compare/PWM modules to maximize flexibility in control applications. Up to four different time bases may be used to perform several different operations at once. Analog Features: All devices in the family feature 10-bit A/D converters, with up to 16 input channels, as well as the ability to perform conversions during Sleep mode. Also included are dual analog comparators with programmable input and output configuration, a programmable Low-Voltage Detect module and a programmable Brown-out Reset module. Self-programmability: These devices can write to their own program memory spaces under internal software control. By using a bootloader routine located in the protected Boot Block at the top of program memory, it becomes possible to create an application that can update itself in the field.
- High-Performance RISC CPU:
- C compiler optimized architecture/instruction set:
- Source code compatible with the PIC16 and PIC17 instruction sets
- Linear program memory addressing to 128 Kbytes
- Linear data memory addressing to 3840 bytes
- 1 Kbyte of data EEPROM
- Up to 10 MIPs operation:
- DC – 40 MHz osc./clock input
- 4 MHz – 10 MHz osc./clock input with PLL active
- 16-bit wide instructions, 8-bit wide data path
- Priority levels for interrupts
- 31-level, software accessible hardware stack
- 8 x 8 Single Cycle Hardware Multiplier
- External Memory Interface (PIC18F8X20 Devices Only):
- Address capability of up to 2 Mbytes
- 16-bit interface
- Peripheral Features:
- High current sink/source 25 mA/25 mA
- Four external interrupt pins
- Timer0 module: 8-bit/16-bit timer/counter
- Timer1 module: 16-bit timer/counter
- Timer2 module: 8-bit timer/counter
- Timer3 module: 16-bit timer/counter
- Timer4 module: 8-bit timer/counter
- Secondary oscillator clock option – Timer1/Timer3
- Five Capture/Compare/PWM (CCP) modules:
- Capture is 16-bit, max. resolution 6.25 ns (TCY/16)
- Compare is 16-bit, max. resolution 100 ns (TCY)
- PWM output: PWM resolution is 1 to 10-bit
- Master Synchronous Serial Port (MSSP) module with two modes of operation:
- 3-wire SPI™ (supports all 4 SPI modes)
- I2C™ Master and Slave mode
- Two Addressable USART modules:
- Supports RS-485 and RS-232
- Parallel Slave Port (PSP) module
- Analog Features:
- 10-bit, up to 16-channel Analog-to-Digital Converter (A/D):
- Conversion available during Sleep
- Programmable 16-level Low-Voltage Detection (LVD) module:
- Supports interrupt on Low-Voltage Detection
- Programmable Brown-out Reset (PBOR)
- Dual analog comparators:
- Programmable input/output configuration Special Microcontroller Features:
- 100,000 erase/write cycle Enhanced Flash program memory typical
- 1,000,000 erase/write cycle Data EEPROM memory typical
- 1 second programming time
- Flash/Data EEPROM Retention: > 40 years
- Self-reprogrammable under software control
- Power-on Reset (POR), Power-up Timer (PWRT) and Oscillator Start-up Timer (OST)
- Watchdog Timer (WDT) with its own On-Chip RC Oscillator for reliable operation
- Programmable code protection
- Power saving Sleep mode
- Selectable oscillator options including:
- 4X Phase Lock Loop (of primary oscillator)
- Secondary Oscillator (32 kHz) clock input
- In-Circuit Serial Programming™ (ICSP™) via two pins
- MPLAB® In-Circuit Debug (ICD) via two pins CMOS Technology:
- Low-power, high-speed Flash technology
- Fully static design
- Wide operating voltage range (2.0V to 5.5V)
- Industrial and Extended temperature ranges
