Introduction
This document contains API documentation for the diagnostic tests included in the MPLAB® Code Configurator PIC16/18 ISO26262 Diagnostic Library.
1 Software Requirements: PIC16
2 Software Requirements: PIC18
3 PIC16 Diagnostic Test APIs
- 3.1 SW_CPU_REGISTER_RESET_STATE_CHECK_01
  This module contains functional safety diagnostics APIs for CPU Registers.
- 3.2 SW_CLOCK_PERIODIC_MONITOR_01
  Software Requirement ID: SW_CLOCK_PERIODIC_MONITOR_01 This module contains APIs to calculate and validate the frequency of the CPU clock using a reference Secondary Oscillator Crystal. It verifies the reliability of the system clock (i.e., the system clock should be neither too fast nor too slow)
- 3.3 SW_CLOCK_PERIODIC_MONITOR_02
  Software Requirement ID: SW_CLOCK_PERIODIC_MONITOR_02. This module contains APIs to calculate, store and validate the frequency of the CPU clock using a reference line frequency.
- 3.4 SW_CPU_REGISTER_TEST_01
  This module contains functional safety diagnostics APIs for CPU Registers.
- 3.5 SW_EEPROM_MEMORY_CHECKSUM_CRC_TEST_01 - CRC16
  This module contains APIs to calculate, store and validate 16-bit CCITT CRC for a given EEPROM region.
- 3.6 SW_EEPROM_MEMORY_CHECKSUM_CRC_TEST_01 - CRC32
  This module contains APIs to calculate, store and validate 32-bit CCITT CRC for a given EEPROM region.
- 3.7 SW_FLASH_MEMORY_CHECKSUM_CRC_TEST_01 - CRC16
  This module contains APIs to calculate, store and validate 16-bit CCITT CRC for a given FLASH region.
- 3.8 SW_FLASH_MEMORY_CHECKSUM_CRC_TEST_01 - CRC32
  This module contains APIs to calculate, store and validate 32-bit CCITT CRC for a given FLASH region.
- 3.9 SW_INTERRUPT_FREQUENCY_TEST_01
  This module contains functional safety diagnostics API for SW_INTERRUPT_FREQUENCY_TEST_01.
- 3.10 SW_SRAM_MARCH_TEST_01 - MarchB
  This module contains functional safety diagnostics API for SRAM March-B.
- 3.11 SW_SRAM_MARCH_TEST_01 - MarchC
  This module contains functional safety diagnostics APIs for SRAM March-C.
- 3.12 SW_SRAM_MARCH_TEST_01 - MarchC_Minus
  This module contains functional safety diagnostics APIs for SRAM March-C Minus.
- 3.13 SW_WATCHDOG_SIMPLE_TIMER_STARTUP_TEST_01
  This module contains functional safety diagnostics APIs for WatchDog Timer Test.
- 3.14 SW_WATCHDOG_WINDOWED_TIMER_STARTUP_TEST_01
  This module contains functional safety diagnostics APIs for WatchDog Timer Test.
- 3.15 File List
  Here is a list of all documented files with brief descriptions
- 3.16 Class List
  Here is a list of all documented files with brief descriptions
4 PIC18 Diagnostic Test APIs

3.14.1.5 TC_MAX_COUNT_BEFORE_ERROR

#define TC_MAX_COUNT_BEFORE_ERROR (11U)

This is a macro for Maximum value of TMR0 overflows before WDT is assumed not to be able to reset device ~11ms Taking the frequency tolerance into account. WDT Timeout is 8ms + ~35% frequency tolerance of clock TC_MAX_COUNT_BEFORE_ERROR = 8ms + 2.8 = 10.8ms ~11ms