PIC24FJ128GA010_12 datasheet(57/258 Pages) MICROCHIP

57 / 258 page

 2005-2012 Microchip Technology Inc.

DS39747F-page 57

PIC24FJ128GA010 FAMILY

6.0

RESETS

The Reset module combines all Reset sources and

controls the device Master Reset Signal, SYSRST. The

following is a list of device Reset sources:

• POR: Power-on Reset

•MCLR: Pin Reset

•SWR: RESET Instruction

• WDT: Watchdog Timer Reset

• BOR: Brown-out Reset

• CM: Configuration Word Mismatch Reset

• TRAPR: Trap Conflict Reset

• IOPUWR: Illegal Opcode Reset

• UWR: Uninitialized W Register Reset

A simplified block diagram of the Reset module is

shown in Figure 6-1.

Any active source of Reset will make the SYSRST sig-

nal active. Many registers associated with the CPU and

peripherals are forced to a known Reset state. Most

registers are unaffected by a Reset; their status is

unknown on POR and unchanged by all other Resets.

All types of device Reset will set a corresponding status

bit in the RCON register to indicate the type of Reset

(see Register 6-1). A POR will clear all bits except for

the BOR and POR bits (RCON<1:0>), which are set.

The user may set or clear any bit at any time during

code execution. The RCON bits only serve as status

bits. Setting a particular Reset status bit in software will

not cause a device Reset to occur.

The RCON register also has other bits associated with

the Watchdog Timer and device power-saving states.

The function of these bits is discussed in other sections

of this manual.

FIGURE 6-1:

RESET SYSTEM BLOCK DIAGRAM

Note:

This data sheet summarizes the features

of this group of PIC24F devices. It is not

intended to be a comprehensive refer-

ence source. Refer to Section 7. “Reset”

(DS39712)

the

“PIC24F

Family

Reference Manual”

for more information.

Note:

Refer to the specific peripheral or CPU

section of this manual for register Reset

states.

Note:

The status bits in the RCON register

should be cleared after they are read so

that the next RCON register value after a

device Reset will be meaningful.

MCLR

VDD

VDD Rise

Detect

POR

Sleep or Idle

Brown-out

Reset

Enable Voltage Regulator

RESET

Instruction

WDT

Module

Glitch Filter

BOR

Trap Conflict

Illegal Opcode

Uninitialized W Register

SYSRST

Configuration Word Mismatch Reset

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