PIC16LC773-04SLASHSP datasheet(127/200 Pages) MICROCHIP

127 / 200 page

PIC16C77X

Advance Information

DS30275A-page 127

12.0

SPECIAL FEATURES OF THE

CPU

These PICmicro devices have a host of

features

intended to maximize system reliability, minimize cost

through elimination of external components, provide

power saving operating modes and offer code protec-

tion. These are:

• Oscillator Selection

• Reset

- Power-on Reset (POR)

- Power-up Timer (PWRT)

- Oscillator Start-up Timer (OST)

- Brown-out Reset (BOR)

• Interrupts

• Watchdog Timer (WDT)

• Low-voltage detection

• SLEEP

• Code protection

• ID locations

• In-circuit serial programming

These devices have a Watchdog Timer which can be

shut off only through configuration bits. It runs off its

own RC oscillator for added reliability. There are two

timers that offer necessary delays on power-up. One is

the Oscillator Start-up Timer (OST), intended to keep

the chip in reset until the crystal oscillator is stable. The

other is the Power-up Timer (PWRT), which provides a

fixed delay of 72 ms (nominal) on power-up type resets

only (POR, BOR), designed to keep the part in reset

while the power supply stabilizes. With these two timers

on-chip, most applications need no external reset cir-

cuitry.

SLEEP mode is designed to offer a very low current

power-down mode. The user can wake-up from SLEEP

through external reset, Watchdog Timer Wake-up, or

through an interrupt. Several oscillator options are also

made available to allow the part to fit the application.

The RC oscillator option saves system cost while the

LP crystal option saves power. A set of configuration

bits are used to select various options.

Additional information on special features is available in

the

PICmicro™

Mid-Range

Reference

Manual,

(DS33023).

12.1

Configuration Bits

The configuration bits can be programmed (read as '0')

or left unprogrammed (read as '1') to select various

device configurations. These bits are mapped in pro-

gram memory location 2007h.

The user will note that address 2007h is beyond the

user program memory space. In fact, it belongs to the

special test/configuration memory space (2000h -

3FFFh), which can be accessed only during program-

ming.

Some of the core features provided may not be neces-

sary to each application that a device may be used for.

The configuration word bits allow these features to be

configured/enabled/disabled as necessary. These fea-

tures include code protection, brown-out reset and its

trippoint, the power-up timer, the watchdog timer and

the devices oscillator mode. As can be seen in

Figure 12-1, some additional configuration word bits

have been provided for brown-out reset trippoint selec-

tion.

PIC16LC773-04/SP Datasheet(PDF) 127 Page - Microchip Technology

PIC16LC773-04/SP Datasheet(HTML) 127 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