PIC16F785-E/SS Microchip Technology, PIC16F785-E/SS Datasheet - Page 28

• 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

PIC16F785/HV785
TABLE 3-3:
3.3.4
The External Resistor-Capacitor (RC) modes support
the use of an external RC circuit. This allows the
designer maximum flexibility in frequency choice while
keeping costs to a minimum when clock accuracy is not
required. There are two modes, RC and RCIO.
In RC mode, the RC circuit connects to the OSC1 pin.
The OSC2/CLKOUT pin outputs the RC oscillator
frequency divided by 4. This signal may be used to
provide a clock for external circuitry, synchronization,
calibration, test or other application requirements.
Figure 3-5 shows the RC mode connections.
FIGURE 3-5:
DS41249E-page 26
LP
XT
HS
Recommended values: 3 kΩ ≤ R
R
C
Osc Type
Note:
V
EXT
Note 1: Higher capacitance increases the stability
EXT
SS
V
DD
2: Since each resonator/crystal has its own
3: RS may be required to avoid overdriving
These values are for design guidance
only. See notes following this table.
EXTERNAL RC MODES
of the oscillator, but also increases the
start-up time.
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate
components.
crystals with low drive level specification.
200 kHz
Crystal
20 MHz
F
32 kHz
1 MHz
4 MHz
4 MHz
8 MHz
Freq.
OSC
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
/4
10 kΩ ≤ R
C
OSC1
OSC2/CLKOUT
RC MODE
EXT
Cap. Range
> 20 pF
15-33 pF
47-68 pF
15-33 pF
15-33 pF
15-33 pF
15-33 pF
15-33 pF
values
EXT
EXT
C1
PIC16F785/HV785
≤ 100 kΩ (V
≤ 100 kΩ (V
of
Cap. Range
15-33 pF
47-68 pF
15-33 pF
15-33 pF
15-33 pF
15-33 pF
15-33 pF
Internal
Clock
DD
DD
external
C2
< 3.0V)
≥ 3.0V)
In RCIO mode, the RC circuit is connected to the OSC1
pin. The OSC2 pin becomes an additional general
purpose I/O pin. The I/O pin becomes bit 4 of PORTA
(RA4). Figure 3-6 shows the RCIO mode connections.
FIGURE 3-6:
The RC oscillator frequency is a function of the supply
voltage, the resistor (R
values and the operating temperature. In addition to
this, the oscillator frequency will vary from unit-to-unit
due to normal threshold voltage. Furthermore, the dif-
ference in lead frame capacitance between package
types will also affect the oscillation frequency or low
C
variation due to tolerance of external RC components
used.
C
Recommended values: 3 kΩ ≤ R
EXT
R
V
EXT
EXT
SS
V
values. The user also needs to take into account
DD
RA4
RCIO MODE
OSC1
10 kΩ ≤ R
C
I/O (OSC2)
© 2008 Microchip Technology Inc.
EXT
EXT
> 20 pF
) and capacitor (C
EXT
EXT
PIC16F785/HV785
≤ 100 kΩ (V
≤ 100 kΩ (V
Internal
Clock
DD
DD
≥ 3.0V)
< 3.0V)
EXT
)