13.15 Resets

The Reset module combines all Reset sources and controls the device Master Reset signal, SYSRST. The device Reset sources are as follows:

  • Power-on Reset (Vdd, IO, or POR)
  • Brown-out Reset (BOR/ZPBOR)
  • Master Clear Reset (MCLR)
  • Watchdog Timer Reset (NMI Counter)
  • Dead Man Timer Reset (NMI Counter)
  • Software Reset (SWR)
  • Test mode Entry and Exit
  • JTAG Reset
  • Configuration Mismatch Reset (CMR)

A simplified block diagram of the Reset module is shown in the following figure. Any active source of reset will make the system Reset signal active. Many registers associated with the CPU and peripherals are forced to a known Reset state.

Figure 13-4. System Reset Block Diagram