PIC16F753 datasheet(151/230 Pages) MICROCHIP

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DS40001709C-page 151

PIC16F753/HV753

19.2

Calibration Bits

The 8 MHz internal oscillator is factory calibrated.

These calibration values are stored in fuses located in

the Calibration Word (2008h). The Calibration Word is

not erased when using the specified bulk erase

sequence in the “PIC16F753/HV753 Flash Memory

Programming Specification” (DS41686) and thus, does

not require reprogramming.

19.3

Reset

The PIC16F753/HV753 device differentiates between

various kinds of Reset:

Power-on Reset (POR)

WDT Reset during normal operation

WDT Reset during Sleep

MCLR Reset during normal operation

MCLR Reset during Sleep

Brown-out Reset (BOR)

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

• Brown-out Reset (BOR)

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 19-2. Software can use

these bits to determine the nature of the Reset. See

Table 19-4 for a full description of Reset states of all

registers.

A simplified block diagram of the On-Chip Reset Circuit

is shown in Figure 19-1.

The MCLR Reset path has a noise filter to detect and

ignore small pulses. See Section 22.0 “Electrical

Specifications” for pulse-width specifications.

FIGURE 19-1:

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

Brown-out(1)

Reset

BOREN

Note

Refer to the Configuration Word register (Register 19-1).

RC OSC

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