PIC18F6X2X datasheet(30/386 Pages) MICROCHIP

30 / 386 page

PIC18F6X2X/8X2X

DS39612A-page 28

Advance Information

 2003 Microchip Technology Inc.

If the main oscillator is configured in the RC, RCIO, EC

or ECIO modes, there is no oscillator start-up time-out.

Operation will resume after eight cycles of the main

oscillator have been counted. A timing diagram, indi-

cating the transition from the Timer1 oscillator to the

main oscillator for RC, RCIO, EC and ECIO modes, is

shown in Figure 2-12.

FIGURE 2-12:

TIMING FOR TRANSITION BETWEEN TIMER1 AND OSC1 (RC, EC)

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

signals will stop oscillating. Since all the transistor

switching 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

Q1 Q2 Q3 Q4 Q1 Q2 Q3

OSC1

Internal System

SCS

(OSCCON<0>)

Program

PC + 2

Note:

RC Oscillator mode assumed.

PC + 4

T1OSI

Clock

TT1P

TOSC

TSCS

Counter

OSC Mode

OSC1 Pin

OSC2 Pin

Floating, external resistor should pull high

At logic low

RCIO

Floating, external resistor should pull high

Configured as PORTA, bit 6

ECIO

Floating

Configured as PORTA, bit 6

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 Section 3.0, “Reset” for time-outs due to SLEEP and MCLR Reset.

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