PIC18F020-ISLASHP datasheet(14/176 Pages) MICROCHIP

14 / 176 page

PIC18F010/020

DS41142A-page 12

Preliminary

 2001 Microchip Technology Inc.

2.7

Effects of SLEEP Mode on the

On-chip Oscillator

When the device executes a SLEEP instruction, the on-

chip clocks and oscillator are turned off and the device

is held at the beginning of an instruction cycle (Q1

state). With the oscillator off, the OSC1 and OSC2 sig-

nals will stop oscillating. Since all the transistor switch-

ing currents have been removed, SLEEP mode

achieves the lowest current consumption of the device

(only leakage currents). Enabling any on-chip feature

that will operate during SLEEP will increase the current

consumed during SLEEP. The user can wake from

SLEEP through external RESET, Watchdog Timer

Reset or through an interrupt.

TABLE 2-3:

OSC1 AND OSC2 PIN STATES IN SLEEP MODE

OSC Mode

OSC1 Pin

OSC2 Pin

Internal Oscillator

Floating, external resistor should pull

high

At logic low

RCIO

Floating, external resistor should pull

high

Configured as PORTB, RB4

Floating

At logic low

LP, XT, and HS

Feedback inverter disabled, at quiescent

voltage level

Feedback inverter disabled, at quiescent

voltage level

Note:

See Table 3-1 in the RESET Section, for time-outs due to SLEEP and MCLR Reset.

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