PIC16F785-E/SS Microchip Technology, PIC16F785-E/SS Datasheet - Page 27

• Manufacturer Part Number: PIC16F785-E/SS
• Description: 20 PIN, 3.5 KB STD FLASH, 128 RAM, 18 I/O PB FREE,
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F785-E/SS

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 3.5KB (2K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT20SS1-1 - SOCKET TRANSITION 20DIP 20SSOPAC162060 - HEADER INTRFC MPLAB ICD2 20PIN
• Connectivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.3.3
The LP, XT and HS modes support the use of quartz
crystal resonators or ceramic resonators connected to
the OSC1 and OSC2 pins (Figure 3-1). The mode
selects a low, medium or high gain setting of the inter-
nal 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.
XT Oscillator mode selects the intermediate gain set-
ting 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, for example, AT-cut quartz
crystal resonators.
HS Oscillator mode selects the highest gain setting of
the internal inverter-amplifier. HS mode current con-
sumption is the highest of the three modes. This mode
is best suited for resonators that require a high drive
setting, for example, AT-cut quartz crystal resonators or
ceramic resonators.
Figure 3-3 and Figure 3-4 show typical circuits for
quartz crystal and ceramic resonators, respectively.
FIGURE 3-3:
© 2008 Microchip Technology Inc.
Note 1: Quartz
Note 1: A series resistor (R
2: Always verify oscillator performance over
C1
C2
2: The value of R
LP, XT, HS MODES
according to type, package and manufac-
turer. The user should consult the manu-
facturer data sheets for specifications
and recommended application.
the V
expected for the application.
quartz crystals with low drive level.
mode selected (typically between 2 MΩ to
10 MΩ).
Quartz
Crystal
R
DD
S
(1)
OSC1
OSC2
and temperature range that is
crystal
QUARTZ CRYSTAL
OPERATION (LP, XT OR
HS MODE)
F
varies with the Oscillator
R
S
F
characteristics
PIC16F785/HV785
) may be required for
(2)
To Internal
Logic
Sleep
vary
FIGURE 3-4:
TABLE 3-2:
XT
HS
Note:
Mode
Note 1: A series resistor (R
C1
PIC16F785/HV785
C2 Ceramic
2: The value of R
3: An additional parallel feedback resistor (R
Resonator
These values are for design guidance
only. See notes following this table.
ceramic resonators with low drive level.
mode selected (typically between 2 MΩ to
10 MΩ).
may be required for proper ceramic resonator
operation (typical value 1 MΩ).
16.0 MHz
455 kHz
2.0 MHz
4.0 MHz
8.0 MHz
Freq.
CERAMIC RESONATORS
R
P (3)
R
OSC1
OSC2
S (1)
CERAMIC RESONATOR
OPERATION
(XT OR HS MODE)
OSC1 (C1)
68-100 pF
F
15-68 pF
10-68 pF
15-68 pF
10-22 pF
varies with the Oscillator
R
PIC16F785/HV785
S
F (2)
) may be required for
DS41249E-page 25
OSC2 (C2)
68-100 pF
To Internal
Logic
15-68 pF
10-68 pF
15-68 pF
10-22 pF
Sleep
P
)