PIC18F25J11-I/PT MICROCHIP [Microchip Technology], PIC18F25J11-I/PT Datasheet - Page 57

• Manufacturer Part Number: PIC18F25J11-I/PT
• Description: 28/44-Pin, Low-Power, High-Performance Microcontrollers with nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

4.0
The PIC18F46J11 family of devices differentiates
among various kinds of Reset:
a)
b)
c)
d)
e)
f)
g)
h)
i)
j)
This section discusses Resets generated by MCLR,
POR and BOR, and covers the operation of the various
start-up timers.
For information on WDT Resets, see Section 25.2
“Watchdog Timer (WDT)”. For Stack Reset events,
see Section 5.1.4.4 “Stack Full and Underflow
Resets” and for Deep Sleep mode, see Section 3.6
“Deep Sleep Mode”.
FIGURE 4-1:
© 2009 Microchip Technology Inc.
Power-on Reset (POR)
MCLR Reset during normal operation
MCLR Reset during power-managed modes
Watchdog
execution)
Configuration Mismatch (CM)
Brown-out Reset (BOR)
RESET Instruction
Stack Full Reset
Stack Underflow Reset
Deep Sleep Reset
MCLR
Note 1: The Brown-out Reset is not available in PIC18LF2XJ11 and PIC18LF4XJ11 devices.
V
DD
RESET
Deep Sleep Reset
Pointer
Stack
Configuration Word Mismatch
PWRT
Timer
Brown-out
INTRC
( )_IDLE
V
Time-out
32 ms
Reset
DD
Detect
WDT
Sleep
Rise
External Reset
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
Stack Full/Underflow Reset
(1)
RESET Instruction
(WDT)
POR Pulse
PWRT
11-Bit Ripple Counter
Reset
66 ms
(during
PIC18F46J11 FAMILY
Figure 4-1 provides a simplified block diagram of the
on-chip Reset circuit.
4.1
Device Reset events are tracked through the RCON
register (Register 4-1). The lower five bits of the register
indicate that a specific Reset event has occurred. In
most cases, these bits can only be set by the event and
must be cleared by the application after the event. The
state of these flag bits, taken together, can be read to
indicate the type of Reset that just occurred. This is
described in more detail in Section 4.7 “Reset State of
Registers”.
The ECON register also has a control bit for setting
interrupt priority (IPEN). Interrupt priority is discussed
in Section 8.0 “Interrupts”.
RCON Register
S
R
Q
DS39932C-page 57
Chip_Reset