PIC12F683-I/MD Microchip Technology Inc., PIC12F683-I/MD Datasheet - Page 23

• Manufacturer Part Number: PIC12F683-I/MD
• Description: 8 PIN, 3.5KB FLASH, 128 RAM, 6 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC12F683-I/MD

• A/d Inputs: 4-Channel, 10-Bit
• Comparators: 1
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Frequency: 20 MHz
• Input Output: 6
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 8-Pin PDIP
• Programmable Memory: 3.5K Bytes
• Ram Size: 128 Bytes
• Serial Interface: None
• 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

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:
 2004 Microchip Technology Inc.
Note 1: Quartz
Note 1: A series resistor (R
2: Always verify oscillator performance over
C1
2: The value of R
C2
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 M
10 M
Quartz
Crystal
R
DD
S
.
(1)
OSC1
OSC2
and temperature range that is
crystal
QUARTZ CRYSTAL
OPERATION (LP, XT OR
HS MODE)
PIC12F683
F
varies with the oscillator
R
S
F
characteristics
(2)
) may be required for
Sleep
To Internal
Logic
vary
to
Preliminary
FIGURE 3-4:
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 fre-
quency divided by 4. This signal may be used to provide
a clock for external circuitry, synchronization, calibra-
tion, test or other application requirements. Figure 3-5
shows the RC mode connections.
FIGURE 3-5:
In RCIO mode, the RC circuit is connected to the OSC1
pin. The OSC2 pin becomes an additional general pur-
pose I/O pin. The I/O pin becomes bit 4 of GPIO (GP4).
Figure 3-6 shows the RCIO mode connections.
R
C
Recommended values:
V
EXT
EXT
SS
Note 1: A series resistor (R
V
DD
C1
C2
2: The value of R
3: An additional parallel feedback resistor (R
Resonator
Ceramic
EXTERNAL RC MODES
ceramic resonators with low drive level.
mode selected (typically between 2 M
10 M
may be required for proper ceramic resonator
operation (typical value 1 M ).
F
OSC
R
/4
.
P
R
OSC1
(3)
OSC2
S
(1)
CERAMIC RESONATOR
OPERATION
(XT OR HS MODE)
OSC1
OSC2/CLKOUT
RC MODE
3 k
C
PIC12F683
EXT
PIC12F683
F
varies with the oscillator
> 20 pF
R
S
R
F (2)
) may be required for
EXT
PIC12F683
DS41211B-page 21
100 k
Internal
To Internal
Logic
Sleep
Clock
P
to
)