PIC17C756-16I/L Microchip Technology, PIC17C756-16I/L Datasheet - Page 17

• Manufacturer Part Number: PIC17C756-16I/L
• Description: MICRO CTRL 16K MEMORY OTP 68PLCC
• Manufacturer: Microchip Technology
• Series: PIC® 17Cr

Specifications of PIC17C756-16I/L

• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: OTP
• Ram Size: 902 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 6 V
• Data Converters: A/D 12x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 68-PLCC
• For Use With: AC164308 - MODULE SKT FOR PM3 68PLCCDVA17XL681 - DEVICE ADAPTER FOR PIC17C752DM173001 - KIT DEVELOPMENT PICDEM17AC174007 - MODULE SKT PROMATEII 68PLCCAC164024 - ADAPTER PICSTART PLUS 68PLCC
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Eeprom Size: -

4.1.3
In the EC oscillator mode, the OSC1 input can be
driven
OSC1/CLKIN pin is hi-impedance and the OSC2/CLK-
OUT pin is the CLKOUT output (4 T
FIGURE 4-4:
Clock from
ext. system
1997 Microchip Technology Inc.
by
EXTERNAL CLOCK OSCILLATOR
CLKOUT
(F
OSC
CMOS
/4)
EXTERNAL CLOCK INPUT
OPERATION (EC OSC
CONFIGURATION)
drivers. In
OSC2
OSC1
PIC17CXXX
OSC
this
).
mode,
Preliminary
the
4.1.4
Either a prepackaged oscillator can be used or a simple
oscillator circuit with TTL gates can be built. Prepack-
aged oscillators provide a wide operating range and
better stability. A well-designed crystal oscillator will
provide good performance with TTL gates. Two types
of crystal oscillator circuits can be used: one with series
resonance, or one with parallel resonance.
Figure 4-5 shows implementation of a parallel resonant
oscillator circuit. The circuit is designed to use the fun-
damental frequency of the crystal. The 74AS04 inverter
performs the 180-degree phase shift that a parallel
oscillator requires. The 4.7 k
negative feedback for stability. The 10 k
ter biases the 74AS04 in the linear region. This could
be used for external oscillator designs.
FIGURE 4-5:
Figure 4-6 shows a series resonant oscillator circuit.
This circuit is also designed to use the fundamental fre-
quency of the crystal. The inverter performs a
180-degree phase shift in a series resonant oscillator
circuit. The 330 k resistors provide the negative feed-
back to bias the inverters in their linear region.
FIGURE 4-6:
74AS04
330 k
10k
EXTERNAL CRYSTAL OSCILLATOR
CIRCUIT
+5V
0.1 F
20 pF
XTAL
10k
74AS04
XTAL
4.7k
EXTERNAL PARALLEL
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
EXTERNAL SERIES
RESONANT CRYSTAL
OSCILLATOR CIRCUIT
74AS04
330 k
20 pF
10k
74AS04
74AS04
resistor provides the
To Other
Devices
DS30264A-page 17
To Other
Devices
potentiome-
PIC17CXXX
PIC17CXXX
OSC1
OSC1