This section discusses Resets generated by MCLR, POR and BOR and covers the operation of the various start-up timers from Recover PIC18F4221 MCU Embedded Program. Stack Reset events are covered in Section 5.1.2.4 “Stack Full and Underflow Resets”. WDT Resets are covered in Section 23.2 “Watchdog Timer (WDT)”.

The PIC18F4221 devices differentiate between various kinds of Reset:

a) Power-on Reset (POR)
b) MCLR Reset during normal operation
c) MCLR Reset during power-managed modes
d) Watchdog Timer (WDT) Reset (during execution)
e) Programmable Brown-out Reset (BOR)
f) RESET Instruction
g) Stack Full Reset
h) Stack Underflow Reset

A simplified block diagram of the on-chip Reset circuit is shown in below Figure.

Device Reset events are tracked through the RCON register (Register 4-1). The lower five bits of the regis- ter indicate that a specific Reset event has occurred. In most cases, these bits can only be cleared by the event and must be set by the application after the event of Crack MCU Memory.

Recover PIC18F4221 MCU Embedded Program

The state of these flag bits, taken together, can be read to indicate the type of Reset that just occurred when Break MCU PIC16LF73 Heximal, This is described in more detail in Section 4.6 “Reset State of Registers”.

The RCON register also has control bits for setting interrupt priority (IPEN) and software control of the BOR (SBOREN) in order to Decrypt LOCKED MCU PIC16LF72 Heximal. Interrupt priority is discussed in Section 9.0 “Interrupts”. BOR is  covered  in Section 4.4 “Brown-out Reset (BOR)”.

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