OPTION_REG datasheet(83/222 Pages) MICROCHIP

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 2013 Microchip Technology Inc.

DS22331A-page 83

MCP19111

14.0

RESETS

The reset logic is used to place the MCP19111 into a

known state. The source of the reset can be

determined by using the device status bits.

There are multiple ways to reset this device:

• Power-on Reset (POR)

• Overtemperature Reset (OT)

•MCLR Reset

•WDT Reset

To allow VDD to stabilize, an optional power-up timer

can be enabled to extend the Reset time after a POR

event.

Some registers are not affected in any Reset condition;

their status is unknown on POR and unchanged in any

other Reset. Most other registers are reset to a “Reset

state” on:

• Power-on Reset

•MCLR Reset

•MCLR Reset during Sleep

• WDT Reset

WDT wake-up does not cause register resets in the

same manner as a WDT Reset since wake-up is

viewed as the resumption of normal operation. TO and

PD bits are set or cleared differently in different Reset

situations, as indicated in Table 14-1. Software can use

these bits to determine the nature of the Reset. See

Table 14-2 for a full description of Reset states of all

registers.

A simplified block diagram of the On-Chip Reset Circuit

is shown in Figure 14-1.

The MCLR Reset path has a noise filter to detect and

ignore

small

pulses.

See

Section 5.0

“Digital

Electrical

Characteristics”

for

pulse-width

specifications.

FIGURE 14-1:

SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT

External

Reset

MCLR/VPP pin

VDD

WDT

Module

VDD Rise

Detect

On-Chip

WDT

Time-out

Power-on Reset

PWRT

Chip_Reset

11-bit Ripple Counter

Reset

Enable PWRT

Sleep

Note 1: Refer to the Configuration Word register (Register 12-1).

RC OSC

TABLE 14-1:

TIME-OUT IN VARIOUS

SITUATIONS

Power-up

Wake-up from

Sleep

PWRTE = 0

PWRTE = 1

TPWRT

——

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