PIC12F683-I/MD Microchip Technology Inc., PIC12F683-I/MD Datasheet - Page 24

• 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

PIC12F683
FIGURE 3-6:
The RC oscillator frequency is a function of the supply
voltage, the resistor (R
values and the operating temperature. Other factors
affecting the oscillator frequency are:
• threshold voltage variation
• component tolerances
• packaging variations in capacitances
3.4
The PIC12F683 has two independent, internal oscilla-
tors that can be configured or selected as the system
clock source.
1.
2.
The system clock speed can be selected via software
using the Internal Oscillator Frequency Select (IRCF)
bits.
The system clock can be selected between external or
internal clock sources via the System Clock Selection
(SCS) bit (see Section 3.5 “Clock Switching”).
DS41211B-page 22
C
R
V
Recommended values:
EXT
EXT
SS
The HFINTOSC (High-Frequency Internal Oscil-
lator) is factory calibrated and operates at 8 MHz.
The frequency of the HFINTOSC can be user
adjusted ±12% via software using the OSCTUNE
register (Register 3-1).
The
Oscillator) is uncalibrated and operates at
approximately 31 kHz.
V
DD
Internal Clock Modes
GP4
LFINTOSC
RCIO MODE
OSC1
I/O (OSC2)
(Low-Frequency
EXT
3 k
C
EXT
) and capacitor (C
> 20 pF
R
EXT
PIC12F683
100 k
Internal
Clock
Internal
EXT
Preliminary
)
3.4.1
The INTRC and INTRCIO modes configure the internal
oscillators as the system clock source when the device
is programmed using the Oscillator Selection (FOSC)
bits in the Configuration Word register (Register 12-1).
In INTRC mode, the OSC1 pin is available for general
purpose I/O. The OSC2/CLKOUT pin outputs the
selected internal oscillator frequency divided by 4. The
CLKOUT signal may be used to provide a clock for
external circuitry, synchronization, calibration, test or
other application requirements.
In INTRCIO mode, the OSC1 and OSC2 pins are
available for general purpose I/O.
3.4.2
The High-Frequency Internal Oscillator (HFINTOSC) is
a factory calibrated 8 MHz internal clock source. The
frequency of the HFINTOSC can be altered approxi-
mately ±12% via software using the OSCTUNE register
(Register 3-1).
The output of the HFINTOSC connects to a postscaler
and multiplexer (see Figure 3-1). One of seven fre-
quencies can be selected via software using the IRCF
bits (see Section 3.4.4 “Frequency Select Bits
(IRCF)”).
The HFINTOSC is enabled by selecting any frequency
between 8 MHz and 125 kHz (IRCF
system clock source (SCS = 1), or when Two-Speed
Start-up is enabled (IESO = 1 and IRCF
The HF Internal Oscillator (HTS) bit (OSCCON<2>)
indicates whether the HFINTOSC is stable or not.
INTRC AND INTRCIO MODES
HFINTOSC
 2004 Microchip Technology Inc.
000) as the
000).