PIC24FJ256GA110_10 Datasheet, PDF (67/330 Pages) Microchip Technology – 64/80/100-Pin, 16-Bit, General Purpose Flash Microcontrollers with Peripheral Pin Select

PIC24FJ256GA110 FAMILY
TABLE 6-1: RESET FLAG BIT OPERATION
Flag Bit
Setting Event
TRAPR (RCON<15>)
IOPUWR (RCON<14>)
CM (RCON<9>)
EXTR (RCON<7>)
SWR (RCON<6>)
WDTO (RCON<4>)
Trap Conflict Event
Illegal Opcode or Uninitialized W Register Access
Configuration Mismatch Reset
MCLR Reset
RESET Instruction
WDT Time-out
SLEEP (RCON<3>)
PWRSAV #SLEEP Instruction
IDLE (RCON<2>)
PWRSAV #IDLE Instruction
BOR (RCON<1>)
POR, BOR
POR (RCON<0>)
POR
Note: All Reset flag bits may be set or cleared by the user software.
Clearing Event
POR
POR
POR
POR
POR
PWRSAV Instruction, POR,
CLRWDT
POR
POR
—
—
6.1 Clock Source Selection at Reset
If clock switching is enabled, the system clock source at
device Reset is chosen as shown in Table 6-2. If clock
switching is disabled, the system clock source is always
selected according to the oscillator Configuration bits.
Refer to Section 8.0 “Oscillator Configuration” for
further details.
TABLE 6-2:
Reset Type
POR
BOR
MCLR
WDTO
SWR
OSCILLATOR SELECTION vs.
TYPE OF RESET (CLOCK
SWITCHING ENABLED)
Clock Source Determinant
FNOSC Configuration bits
(CW2<10:8>)
COSC Control bits
(OSCCON<14:12>)
6.2 Device Reset Times
The Reset times for various types of device Reset are
summarized in Table 6-3. Note that the system Reset
signal, SYSRST, is released after the POR and PWRT
delay times expire.
The time at which the device actually begins to execute
code will also depend on the system oscillator delays,
which include the Oscillator Start-up Timer (OST) and
the PLL lock time. The OST and PLL lock times occur
in parallel with the applicable SYSRST delay times.
The FSCM delay determines the time at which the
FSCM begins to monitor the system clock source after
the SYSRST signal is released.
 2010 Microchip Technology Inc.
DS39905E-page 67