PIC16F630-E/SL Microchip Technology, PIC16F630-E/SL Datasheet - Page 58

• Manufacturer Part Number: PIC16F630-E/SL
• Description: 14 PIN, 1.75KB STD FLASH, 64 RAM, 12 I/O,
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F630-E/SL

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, POR, WDT
• Number Of I /o: 12
• Program Memory Size: 1.75KB (1K x 14)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 64 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Connectivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC16F630/676
9.2.3
For applications where a clock is already available
elsewhere, users may directly drive the PIC16F630/
676 provided that this external clock source meets the
AC/DC timing requirements listed in Section 12.0
“Electrical Specifications”. Figure 9-2 shows how
an external clock circuit should be configured.
9.2.4
For applications where precise timing is not a
requirement, the RC oscillator option is available. The
operation and functionality of the RC oscillator is
dependent upon a number of variables. The RC
oscillator frequency is a function of:
• Supply voltage
• Resistor (R
• Operating temperature
The oscillator frequency will vary from unit to unit due
to normal process parameter variation. The difference
in lead frame capacitance between package types will
also affect the oscillation frequency, especially for low
C
tolerance of the external R and C components.
Figure 9-3 shows how the R/C combination is
connected.
Two options are available for this Oscillator mode
which allow RA4 to be used as a general purpose I/O
or to output F
FIGURE 9-3:
DS40039F-page 58
C
EXT
V
R
EXT
SS
EXT
F
values. The user also needs to account for the
V
OSC
DD
/4
EXTERNAL CLOCK IN
RC OSCILLATOR
OSC
EXT
RA5/OSC1/
CLKIN
RA4/OSC2/CLKOUT
) and capacitor (C
/4.
RC OSCILLATOR MODE
PIC16F630/676
EXT
) values
Internal
Clock
9.2.5
When calibrated, the internal oscillator provides a fixed
4 MHz (nominal) system clock. See Electrical
Specifications, Section 12.0 “Electrical Specifica-
tions”, for information on variation over voltage and
temperature.
Two options are available for this Oscillator mode
which allow RA4 to be used as a general purpose I/O
or to output F
9.2.5.1
A calibration instruction is programmed into the last
location of program memory. This instruction is a
RETLW XX, where the literal is the calibration value.
The literal is placed in the OSCCAL register to set the
calibration of the internal oscillator. Example 9-1
demonstrates how to calibrate the internal oscillator.
For best operation, decouple (with capacitance) V
and V
EXAMPLE 9-1:
9.2.6
The PIC16F630/676 devices can be configured to
provide a clock out signal in the INTOSC and RC
Oscillator modes. When configured, the oscillator
frequency divided by four (F
RA4/OSC2/CLKOUT pin. F
purposes or to synchronize other logic.
Note:
BSF
CALL
MOVWF
BCF
SS
as close to the device as possible.
Erasing the device will also erase the pre-
programmed internal calibration value for
the internal oscillator. The calibration value
must be saved prior to erasing part as
specified in the PIC16F630/676 Program-
ming specification. Microchip Develop-
ment Tools maintain all calibration bits to
factory settings.
INTERNAL 4 MH
CLKOUT
STATUS, RP0
3FFh
OSCCAL
STATUS, RP0
OSC
Calibrating the Internal Oscillator
/4.
CALIBRATING THE
INTERNAL OSCILLATOR
 2010 Microchip Technology Inc.
OSC
OSC
;Bank 1
;Get the cal value
;Calibrate
;Bank 0
Z
/4 can be used for test
OSCILLATOR
/4) is output on the
DD