PIC18F24J10-E/ML MICROCHIP [Microchip Technology], PIC18F24J10-E/ML Datasheet - Page 39

• Manufacturer Part Number: PIC18F24J10-E/ML
• Description: 28/40/44-Pin High-Performance RISC Microcontrollers with nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

4.0
The PIC18F45J10 family of devices differentiate
between various kinds of Reset:
a)
b)
c)
d)
e)
f)
g)
h)
This section discusses Resets generated by MCLR,
POR and BOR and covers the operation of the various
start-up timers. Stack Reset events are covered in
Section 5.1.2.4 “Stack Full and Underflow Resets”.
WDT Resets are covered in Section 20.2 “Watchdog
Timer (WDT)”.
A simplified block diagram of the On-Chip Reset Circuit
is shown in Figure 4-1.
FIGURE 4-1:
© 2007 Microchip Technology Inc.
Note 1: The Brown-out Reset is not available in PIC18LF2XJ10/4XJ10 devices.
MCLR
V
Power-on Reset (POR)
MCLR Reset during normal operation
MCLR Reset during power-managed modes
Watchdog Timer (WDT) Reset (during
execution)
Brown-out Reset (BOR)
RESET Instruction
Stack Full Reset
Stack Underflow Reset
DD
RESET
Instruction
RESET
Pointer
Stack
PWRT
( )_IDLE
Brown-out
Time-out
V
INTRC
Reset
32 μs
Detect
Sleep
DD
WDT
Rise
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
(1)
Stack Full/Underflow Reset
External Reset
POR Pulse
PWRT
11-bit Ripple Counter
65.5 ms
Preliminary
PIC18F45J10 FAMILY
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 4.6 “Reset State of Registers”.
The RCON register also has a control bit for setting
interrupt priority (IPEN). Interrupt priority is discussed
in Section 8.0 “Interrupts”.
RCON Register
S
R
DS39682C-page 37
Q
Chip_Reset