8-Bit MCUs
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8-Bit MCUs
- PIC MCUs
- AVR MCUs
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Peripherals
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Core Independent
- 16-bit Pulse Width Modulation
- 24-bit Signal Measurement Timer
- Angular Timer
- Configurable Logic Cell
- Cyclic Redundancy Check
- Complementary Waveform Generator
- Event System
- Hardware Limit Timer
- High Endurance Flash
- Math Accelerator
- Numerically Controlled Oscillator
- Peripheral Pin Select
- Temperature Indicator
- Windowed Watch Dog Timer
- Intelligent Analog
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Core Independent
- Functional Safety
- Resources
- Development Tools
8-bit Resources
8-bit Development Tools
Functional Safety
Microchip has an ever-expanding offering of solutions for your functional safety needs. Several hardware peripherals and functions have been integrated into our 8-bit PIC® and AVR® portfolios of microcontrollers (MCUs) to help increase the reliability and redundancy for a broad range of applications. The table below describes the hardware modules available on the different families of 8-bit microcontroller devices. System-level monitors are included for POR, BOR, WWDT, Hardware Limit Timer as well as many other fault detection and reliability features.
Microchip has developed a library of low-level software routines that simplify meeting IEC 60730 requirements for Class B Safety. Application notes are available that describe the Application Programming Interface (API) functions and their use that are available in the Class B Safety Software Library for both PIC and AVR microcontrollers.
Hardware Modules
- Clocking systems including backup oscillators
- GPIO with ESD protection
- Power system monitors: POR, BOR, HLVD
- System monitors: Hardware Limit Timer, WWDT
Software Modules
- Detect occurrence of faults in a single-channel CPU
- Developed in accordance with IEC 60730 to support Class B Certification
- Routines integrate into MCU applications to test and verify critical functionalities without affecting the end application
Whole Ecosystem
- ISO26262 certified compiler
- FMEDA report*
- MPLAB® X IDE MISRA plug-in
- Affiliation with certification bodies (VDE, UL)
- Plug-in for code coverage tools by LDRA
MPLAB® XC Compiler Functional Safety Manual
Register below to learn more about functional safety applications for up to ISO 26262 ASIL D.
Functional Safety Relevant Features for 8-bit PIC and AVR MCUs
Dedicated Core Independent Peripherals and functions have been integrated into the 8-bit PIC and AVR devices to help increase the reliability and monitoring for safety-critical applications. Together these features help ensure end applications operate as intended, with safe shut down if any exception or issue arises.
| - CRC module |
| - Read/write protection |
| - Boot segment protection |
| - RAM variable memory test |
| - Self-readable Flash memory |
| - Power-on and brown-out resets |
| - Window watchdog timer |
| - Hardware limit timer |
| - High/low voltage detect |
| - Unique ID |
| - Asynchronous master clear reset |
| - CAN port loopback mode |
| - ESD protection |
| - Peripheral Pin Select (PPS) |
| - Self-readable output pins |
| - Fail safe Clock monitor |
| - Frequency detect* |
| - Windowed watchdog |
| - Hardware Limit timer |
*Class B Safety Software function
| - Program counter stuck-at fault* |
| - CPU register test* |
*Class B Safety Software function
| - Internal voltage reference |
| - Zero cross detection module |
| - C-compiler qualified per ISO-26262 |
| - LDRA Compliance Management Tool Suite support |
| Functional Safety Relevant Feature | PIC10FXXX | PIC12/16F1XX | PIC18FXXXX | XMEGA AVR | MEGA AVR | TINY AVR |
|---|---|---|---|---|---|---|
| Self-Readable Output Pins | ● | ● | ● | ● | ● | ● |
| Watchdog Timer (WDT) + Internal RC Osc. | ● | ● | ● | ● | ● | ● |
| Windowed Watchdog Timer (WWDT) | - | ○ | ○ | ● | ● | ○ |
| Asynchronous Master Clear Reset (MCLR) | ● | ● | ● | ○ | ○ | ○ |
| Under Voltage Detection (BOR, PLVD, HLVD) | ○ | ● | ● | ● | ● | ● |
| Over Voltage Detection (HLVD) | - | - | ○ | - | - | - |
| Self-Readable Flash Memory | ○ | ● | ● | ● | ● | ● |
| Fail-Safe Clock Mode (FSCM) | ○ | ● | ● | ● | - | - |
| Hardware CRC Engine (RAM/Flash/Data Comm) | - | ○ | ○ | ○ | ○ | ○ |
| CAN Port Loopback Mode | - | - | ○ | - | ○ | - |
| Hardware Limit Timer (HLT) | - | ○ | - | ● | ○ | ○ |
| C-Compiler ASIL-D Qualified per ISO-26262 | ● | ● | ● | - | - | - |
| LDRA Compliance Management Tool Suite | ● | ● | ● | - | - | - |
| Configuration Change Protection | - | - | ○ | ● | ● | ● |
| Sleep Disable | - | - | - | ● | ● | ● |
| Hardware Stack Overflow/Underflow Protection | - | ○ | ○ | - | - | - |
| Interrupt Priority Configuration | - | - | ● | ● | ○ | ○ |
| PWM Hardware Shutdown | - | - | ● | ● | ● | ● |
● Available in all devices
○ Available in some devices
- Not Available