PIC16C641-04SLASHSP datasheet(59/136 Pages) MICROCHIP

59 / 136 page

Preliminary

DS30559A-page 59

PIC16C64X & PIC16C66X

9.3

Reset

The PIC16CXXX differentiates between various kinds

of reset:

Power-on reset (POR)

MCLR reset during normal operation

MCLR reset during SLEEP

WDT reset (normal operation)

Brown-out Reset (BOR)

Parity Error Reset (PER)

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”

Power-on

reset,

MCLR,

WDT

reset,

Brown-out Reset, Parity Error Reset, and on MCLR

reset during SLEEP. They are not affected by a WDT

wake-up, since this is viewed as the resumption of nor-

mal operation. TO and PD bits are set or cleared differ-

ently in different reset situations as indicated in

Table 9-4. These bits are used in software to determine

the nature of the reset. See Table 9-6 for a full descrip-

tion of reset states of all registers.

A simpliﬁed block diagram of the on-chip reset circuit is

shown in Figure 9-7.

The MCLR reset path has a noise ﬁlter to detect and

ignore small pulses. See Table 12-6 for pulse width

speciﬁcation.

FIGURE 9-7:

SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT

External

Reset

MCLR/

VDD

OSC1/

WDT

Module

VDD rise

detect

OST/PWRT

On-chip(1)

RC OSC

WDT Time-out

Power-on Reset

OST

PWRT

Chip_Reset

10-bit Ripple-counter

Enable OST

Enable PWRT

SLEEP

See Table 9-3 for time-out situations.

Note 1: This is a separate oscillator from the RC oscillator of the CLKIN pin.

Brown-out

Reset

BODEN

CLKIN

VPP Pin

10-bit Ripple-counter

Program

Memory

Parity

MPEEN

PIC16C641-04/SP Datasheet(PDF) 59 Page - Microchip Technology

PIC16C641-04/SP Datasheet(HTML) 59 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL