PIC16F819 Datasheet

IC型号：
PIC16F819
PDF描述：
18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Tech...
文件大小：
68.31KB
PDF页数：
176页
芯片厂家：
MICROCHIP

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PIC16F818/819

12.2

Reset

The PIC16F818/819 differentiates between various

kinds of Reset:

鈥?/div>

Power-on Reset (POR)

MCLR Reset during normal operation

MCLR Reset during Sleep

WDT Reset during normal operation

WDT wake-up 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 鈥淩eset

state鈥?on Power-on Reset (POR), on the MCLR and

WDT Reset, on MCLR Reset during Sleep, and Brown-

out Reset (BOR). They are not affected by a WDT

wake-up which is viewed as the resumption of normal

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

ently in different Reset situations as indicated in

Table 12-3. These bits are used in software to deter-

mine the nature of the Reset. Upon a POR, BOR or

wake-up from Sleep, the CPU requires approximately

5-10

碌s

to become ready for code execution. This

delay runs in parallel with any other timers. See

Table 12-4 for a full description of Reset states of all

registers.

A simplified block diagram of the on-chip Reset circuit

is shown in Figure 12-1.

FIGURE 12-1:

SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT

External

Reset

MCLR

WDT

Module

Rise

Detect

Brown-out

Reset

BOREN

OST/PWRT

OST

10-bit Ripple Counter

OSC1

Chip_Reset

Power-on Reset

WDT

Sleep

Time-out

Reset

PWRT

INTRC

31.25 kHz

10-bit Ripple Counter

Enable PWRT

Enable OST

铮?/div>

2003 Microchip Technology Inc.

Preliminary

DS39598D-page 91

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