PIC18F24 MICROCHIP [Microchip Technology], PIC18F24 Datasheet - Page 27
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PIC18F24
Manufacturer Part Number
PIC18F24
Description
28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F24.pdf
(402 pages)
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3.0
The PIC18FXX8 differentiates between various kinds
of RESET:
a)
b)
c)
d)
e)
f)
g)
h)
Most registers are unaffected by a Reset. Their status
is unknown on POR and unchanged by all other
Resets. The other registers are forced to a “Reset”
FIGURE 3-1:
2004 Microchip Technology Inc.
MCLR
OSC1
V
Power-on Reset (POR)
MCLR Reset during normal operation
MCLR Reset during Sleep
Watchdog Timer (WDT) Reset during normal
operation
Programmable Brown-out Reset (PBOR)
RESET Instruction
Stack Full Reset
Stack Underflow Reset
Note 1: This is a separate oscillator from the RC oscillator of the CLKI pin.
DD
Instruction
RESET
RESET
Pointer
RC OSC
Stack
2: See Table 3-1 for time-out situations.
On-chip
OST/PWRT
Brown-out
V
Module
Detect
DD
WDT
Reset
(1)
Rise
Stack Full/Underflow Reset
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
OST
PWRT
Time-out
Reset
WDT
10-bit Ripple Counter
External Reset
10-bit Ripple Counter
BOREN
Power-on Reset
Sleep
state on Power-on Reset, MCLR, WDT Reset, Brown-
out Reset, MCLR Reset during Sleep and by the
RESET instruction.
Most registers are not affected by a WDT wake-up,
since this is viewed as the resumption of normal oper-
ation. Status bits from the RCON register, RI, TO, PD,
POR and BOR are set or cleared differently in different
Reset situations, as indicated in Table 3-2. These bits
are used in software to determine the nature of the
Reset. See Table 3-3 for a full description of the Reset
states of all registers.
A simplified block diagram of the On-Chip Reset Circuit
is shown in Figure 3-1.
The Enhanced MCU devices have a MCLR noise filter
in the MCLR Reset path. The filter will detect and
ignore small pulses.
A WDT Reset does not drive MCLR pin low.
PIC18FXX8
S
R
Enable PWRT
Enable OST
DS41159D-page 25
Q
Chip_Reset
(2)
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