PIC16F688-I/SL Microchip Technology Inc., PIC16F688-I/SL Datasheet - Page 26

• Manufacturer Part Number: PIC16F688-I/SL
• Description: 14 PIN, 7 KB FLASH, 256 RAM, 12 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F688-I/SL

• A/d Inputs: 8-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 12
• Interface: USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 14-pin SOIC-N
• Programmable Memory: 7K Bytes
• Ram Size: 256 Bytes
• Speed: 20 MHz
• Timers: 1-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16F688
3.4.3
The LP, XT and HS modes support the use of quartz
crystal resonators or ceramic resonators connected to
OSC1 and OSC2 (Figure 3-3). The mode selects a low,
medium or high gain setting of the internal inverter-
amplifier to support various resonator types and speed.
LP Oscillator mode selects the lowest gain setting of
the internal inverter-amplifier. LP mode current con-
sumption is the least of the three modes. This mode is
best suited to drive resonators with a low drive level
specification, for example, tuning fork type crystals.
This mode is designed to drive only 32.768 kHz tuning-
fork type crystals (watch crystals).
XT Oscillator mode selects the intermediate gain
setting of the internal inverter-amplifier. XT mode
current consumption is the medium of the three modes.
This mode is best suited to drive resonators with a
medium drive level specification.
HS Oscillator mode selects the highest gain setting of the
internal inverter-amplifier. HS mode current consumption
is the highest of the three modes. This mode is best
suited for resonators that require a high drive setting.
Figure 3-3 and Figure 3-4 show typical circuits for
quartz crystal and ceramic resonators, respectively.
FIGURE 3-3:
DS41203C-page 24
Note 1: A series resistor (R
C1
C2
2: The value of R
quartz crystals with low drive level.
selected (typically between 2 M
LP, XT, HS MODES
Quartz
Crystal
R
S
(1)
QUARTZ CRYSTAL
OPERATION (LP, XT OR
HS MODE)
F
varies with the Oscillator mode
OSC1/CLKIN
OSC2/CLKOUT
R
S
F
PICmicro
(2)
) may be required for
®
MCU
to 10 M
Sleep
To Internal
Logic
.
FIGURE 3-4:
Note 1: A series resistor (R
Note 1: Quartz crystal characteristics vary according
C1
C2 Ceramic
2: The value of R
3: An additional parallel feedback resistor (R
2: Always verify oscillator performance over
3: For oscillator design assistance, reference
Resonator
ceramic resonators with low drive level.
selected (typically between 2 M to 10 M
may be required for proper ceramic resonator
operation.
• AN826, “Crystal Oscillator Basics and
• AN849, “Basic PICmicro
• AN943, “Practical PICmicro
• AN949, “Making Your Oscillator Work”
to type, package and manufacturer. The
user should consult the manufacturer data
sheets for specifications and recommended
application.
the V
expected for the application.
the following Microchip Applications Notes:
Crystal Selection for rfPIC
PICmicro
Design” (DS00849)
Analysis and Design” (DS00943)
(DS00949)
DD
R
P
R
(3)
S
and temperature range that is
(1)
®
CERAMIC RESONATOR
OPERATION
(XT OR HS MODE)
© 2006 Microchip Technology Inc.
Devices” (DS00826)
F
varies with the Oscillator mode
OSC1/CLKIN
OSC2/CLKOUT
S
R
) may be required for
F
PICmicro
(2)
®
®
Oscillator
®
and
®
Oscillator
MCU
To Internal
Logic
Sleep
.
P
)