PIC16F88-I/SO Microchip Technology Inc., PIC16F88-I/SO Datasheet - Page 37

• Manufacturer Part Number: PIC16F88-I/SO
• Description: 18 PIN, 7 KB FLASH, 368 RAM, 16 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F88-I/SO

• A/d Inputs: 7-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 16
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 18-pin SOIC
• Programmable Memory: 7K Bytes
• Ram Size: 368 Bytes
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

4.0
4.1
The PIC16F87/88 can be operated in eight different
oscillator modes. The user can program three configu-
ration bits (FOSC2:FOSC0) to select one of these eight
modes (modes 5-8 are new PIC16 oscillator
configurations):
1.
2.
3.
4.
5.
6.
7.
8.
4.2
In XT, LP or HS modes, a crystal or ceramic resonator
is connected to the OSC1/CLKI and OSC2/CLKO pins
to establish oscillation (see Figure 4-1 and Figure 4-2).
The PIC16F87/88 oscillator design requires the use of
a parallel cut crystal. Use of a series cut crystal may
give a frequency out of the crystal manufacturer’s
specifications.
FIGURE 4-1:
 2005 Microchip Technology Inc.
Note1: See Table 4-1 for typical values of C1 and C2.
LP
XT
HS
RC
RCIO
INTIO1
INTIO2
ECIO
2: A series resistor (R
3: R
C1
C2
cut crystals.
between 2 M
OSCILLATOR
CONFIGURATIONS
Oscillator Types
Crystal Oscillator/Ceramic
Resonators
F
(1)
(1)
varies with the crystal chosen (typically
XTAL
R
Low-Power Crystal
Crystal/Resonator
High-Speed Crystal/Resonator
External Resistor/Capacitor with
F
External Resistor/Capacitor with
I/O on RA6
Internal Oscillator with F
output on RA6 and I/O on RA7
Internal Oscillator with I/O on RA6
and RA7
External Clock with I/O on RA6
S
OSC
(2)
OSC1
OSC2
/4 output on RA6
to 10 M
CRYSTAL OPERATION
(HS, XT, OR LP
OSCILLATOR
CONFIGURATION)
S
) may be required for AT strip
R
F (3)
.
PIC16F87/88
OSC
To Internal
Logic
Sleep
/4
TABLE 4-1:
Capacitor values are for design guidance only.
These capacitors were tested with the crystals listed
below for basic start-up and operation. These values
were not optimized.
Different capacitor values may be required to produce
acceptable oscillator operation. The user should test
the performance of the oscillator over the expected
V
See the notes following this table for additional
information.
Osc Type
DD
Note 1: Higher capacitance increases the stability
HS
LP
XT
and temperature range for the application.
2: Since each crystal has its own character-
3: Rs may be required in HS mode, as well
4: Always verify oscillator performance over
of oscillator but also increases the
start-up time.
istics, the user should consult the crystal
manufacturer for appropriate values of
external components.
as XT mode, to avoid overdriving crystals
with low drive level specification.
the V
expected for the application.
200 kHz
20 MHz
Crystal
32 kHz
1 MHz
4 MHz
4 MHz
8 MHz
Freq
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR (FOR
DESIGN GUIDANCE ONLY)
DD
PIC16F87/88
and temperature range that is
Typical Capacitor Values
33 pF
56 pF
15 pF
15 pF
15 pF
15 pF
15 pF
C1
Tested:
DS30487C-page 35
33 pF
56 pF
15 pF
15 pF
15 pF
15 pF
15 pF
C2