PIC18F010 datasheet(85/176 Pages) MICROCHIP

85 / 176 page

 2001 Microchip Technology Inc.

Preliminary

DS41142A-page 83

PIC18F010/020

12.0

SPECIAL FEATURES OF THE

CPU

There are several features intended to maximize sys-

tem reliability, minimize cost through elimination of

external components, provide power saving operating

modes and offer code protection. These are:

• OSC Selection

• RESET

- Power-on Reset (POR)

- Power-up Timer (PWRT)

- Oscillator Start-up Timer (OST)

- Brown-out Reset (BOR)

• Interrupts

• Watchdog Timer (WDT)

• SLEEP

• Code Protection

• ID Locations

• In-Circuit Serial ProgrammingTM

These devices have a Watchdog Timer, which is per-

manently enabled via the configuration bits or software-

controlled. It runs off its own internal oscillator for

added reliability. There are two timers that offer neces-

sary 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 on

power-up only, designed to keep the part in RESET

while the power supply stabilizes. With these two tim-

ers on-chip, most applications need no external

RESET circuitry.

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 internal oscillator option saves system cost, while

the LP crystal option saves power. A set of configura-

tion bits are used to select various options.

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 starting

at program memory location 300000h.

The user will note that address 300000h is beyond the

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

configuration memory space (300000h - 3FFFFFh),

which can only be accessed using table reads and

table writes.

TABLE 12-1:

CONFIGURATION BITS AND DEVICE IDS

File Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Factory/

Programmed

Value

300000h

CONFIG1L

—

TR1

TW1

CP1

TR0

TW0

CP0

-111 1111

300001h

CONFIG1H

—

OSCEN

MCLRE

—

FOSC2

FOSC1

FOSC0

--01 -100

300002h

CONFIG2L

—

BOREN

PWRTE

---- --11

300003h

CONFIG2H

reserved

—

STVRE

WDTLE

WDPS2

WDPS1

WDPS0

WDTE

1-11 1111

300104h

FOSCCAL

—

FCAL5

FCAL4

FCAL3

FCAL2

FCAL1

FCAL0

--uu uuuu

300105h

Unused. Always reads ‘0’s.

0000 0000

3FFFFEh

DEVID1

DEV2

DEV1

DEV0

REV4

REV3

REV2

REV1

REV0

01dr rrrr

3FFFFFh

DEVID2

DEV10

DEV9

DEV8

DEV7

DEV6

DEV5

DEV4

DEV3

0000 0011

Legend:

= unknown, u = unchanged, - = unimplemented, q = value depends on condition, grayed cells are unimplemented, read as ‘0’

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