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PIC18F6720 Datasheet

  • PIC18F6720

  • 64/80-Pin High-Performance,256 Kbit to 1 Mbit Enhanced Flash...

  • 3274.08KB

  • 380页

  • Microchip   Microchip

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PIC18F6520/8520/6620/8620/6720/8720
2.7
Effects of Sleep Mode on the
On-Chip Oscillator
2.8
Power-up Delays
Power up delays are controlled by two timers so that no
external Reset circuitry is required for most
applications. The delays ensure that the device is kept
in Reset until the device power supply and clock are
stable. For additional information on Reset operation,
see
Section 3.0 鈥淩eset鈥?
The first timer is the Power-up Timer (PWRT), which
optionally provides a fixed delay of 72 ms (nominal) on
power-up only (POR and BOR). The second timer is
the Oscillator Start-up Timer (OST), intended to keep
the chip in Reset until the crystal oscillator is stable.
With the PLL enabled (HS/PLL Oscillator mode), the
time-out sequence following a Power-on Reset is differ-
ent from other oscillator modes. The time-out sequence
is as follows: First, the PWRT time-out is invoked after
a POR time delay has expired. Then, the Oscillator
Start-up Timer (OST) is invoked. However, this is still
not a sufficient amount of time to allow the PLL to lock
at high frequencies. The PWRT timer is used to provide
an additional fixed 2 ms (nominal) time-out to allow the
PLL ample time to lock to the incoming clock frequency.
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:
OSC Mode
RC
RCIO
ECIO
EC
LP, XT and HS
Note:
OSC1 AND OSC2 PIN STATES IN SLEEP MODE
OSC1 Pin
Floating, external resistor should pull high
Floating, external resistor should pull high
Floating
Floating
Feedback inverter disabled at quiescent
voltage level
OSC2 Pin
At logic low
Configured as PORTA, bit 6
Configured as PORTA, bit 6
At logic low
Feedback inverter disabled at quiescent
voltage level
See Table 3-1 in
Section 3.0 鈥淩eset鈥?/span>
for time-outs due to Sleep and MCLR Reset.
DS39609B-page 28
铮?/div>
2004 Microchip Technology Inc.

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