PIC16F84A-20/P Microchip Technology Inc., PIC16F84A-20/P Datasheet - Page 24

• Manufacturer Part Number: PIC16F84A-20/P
• Description: 18 PIN, 1.75 KB FLASH, 68 RAM, 13 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F84A-20/P

• Cpu Speed: 5 MIPS
• Eeprom Memory: 64 Bytes
• Input Output: 13
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 18-pin PDIP
• Programmable Memory: 1.75K Bytes
• Ram Size: 68 Bytes
• Speed: 20 MHz
• Timers: 1-8-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16F84A
6.2
6.2.1
The PIC16F84A can be operated in four different
oscillator modes. The user can program two
configuration bits (FOSC1 and FOSC0) to select one of
these four modes:
• LP
• XT
• HS
• RC
6.2.2
In XT, LP, or HS modes, a crystal or ceramic resonator
is connected to the OSC1/CLKIN and OSC2/CLKOUT
pins to establish oscillation (Figure 6-1).
FIGURE 6-1:
The PIC16F84A oscillator design requires the use of a
parallel cut crystal. Use of a series cut crystal may give
a frequency out of the crystal manufacturers
specifications. When in XT, LP, or HS modes, the
device can have an external clock source to drive the
OSC1/CLKIN pin (Figure 6-2).
DS35007B-page 22
Note 1: See Table 6-1 for recommended values
C1
C2
Oscillator Configurations
(1)
(1)
2: A series resistor (R
Low Power Crystal
Crystal/Resonator
High Speed Crystal/Resonator
Resistor/Capacitor
CRYSTAL OSCILLATOR/CERAMIC
RESONATORS
OSCILLATOR TYPES
of C1 and C2.
XTAL
for AT strip cut crystals.
R
S
(2)
OSC1
OSC2
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP OSC
CONFIGURATION)
R
F
(3)
S
) may be required
SLEEP
PIC16FXX
To
Internal
Logic
FIGURE 6-2:
TABLE 6-1:
Ranges Tested:
Note:
Note:
Clock from
Ext. System
Mode
HS
XT
Recommended values of C1 and C2 are
identical to the ranges tested in this table.
Higher capacitance increases the stability
of the oscillator, but also increases the
start-up time. These values are for design
guidance only. Since each resonator has
its own characteristics, the user should
consult the resonator manufacturer for the
appropriate values of external compo-
nents.
When using resonators with frequencies
above 3.5 MHz, the use of HS mode rather
than XT mode, is recommended. HS mode
may be used at any V
controller is rated.
Open
10.0 MHz
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
Freq
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR
LP OSC
CONFIGURATION)
2001 Microchip Technology Inc.
47 - 100 pF
OSC1
OSC2
15 - 33 pF
15 - 33 pF
15 - 33 pF
15 - 33 pF
OSC1/C1
PIC16FXX
DD
for which the
47 - 100 pF
15 - 33 pF
15 - 33 pF
15 - 33 pF
15 - 33 pF
OSC2/C2