RFPIC12F675F-I/SS Microchip Technology, RFPIC12F675F-I/SS Datasheet - Page 60

• Manufacturer Part Number: RFPIC12F675F-I/SS
• Description: IC MCU 1KX14 RF FSK/ASK 20SSOP
• Manufacturer: Microchip Technology
• Series: PIC®r

Specifications of RFPIC12F675F-I/SS

• Package / Case: 20-SSOP
• Frequency: 380MHz ~ 450MHz
• Applications: RKE, Security Systems
• Modulation Or Protocol: ASK, FSK
• Data Rate - Maximum: 40 kbps
• Power - Output: 10dBm
• Current - Transmitting: 14mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Memory Size: 1024 x 14 words Flash, 128 x 8 Byte EEPROM, 64 x 8 Byte SRAM
• Voltage - Supply: 2V ~ 5.5V
• Operating Temperature: -40°C ~ 125°C
• Processor Series: RFPIC12F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 64 B
• Interface Type: USB
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 6
• Number Of Timers: 2
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ICE2000, DV164102, AC164101, AC164103
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 4-ch x 10-bit
• Program Memory Type: Flash
• Program Memory Size: 1.75 KB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT20SS-1 - SOCKET TRANSITION 18DIP 20SSOPAC164103 - MODULE RCVR RFPIC 433MHZAC164101 - MODULE TRANSMITTER RFPIC 433MHZDV164102 - KIT DEV RFPICKIT KIT 1AC124002 - MOD SKT PROMATEII 18SOIC/20SSOP
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: Q3188156

rfPIC12F675
10.2.3
For applications where a clock is already available
provided that this external clock source meets the AC/
DC timing requirements listed in Section 13.0.
Figure 10-2 shows how an external clock circuit
should be configured.
10.2.4
For applications where precise timing is not a require-
ment, 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 10-3 shows how the R/C combination is
connected.
Two options are available for this Oscillator mode
which allow GP4 to be used as a general purpose I/O
or to output F
FIGURE 10-3:
DS70091A-page 58
elsewhere, users may directly drive the rfPIC12F675
C
EXT
R
V
Note:
EXT
SS
EXT
F
values. The user also needs to account for the
V
OSC
DD
/4
The microcontroller oscillator is indepen-
dent of the RF peripheral oscillator. An
accurate time-base is still possible with
only one crystal. Use the RF crystal on
transmitter and tie the REFCLK signal
back into T0CKI or T1CKI to correct the
RC, INTOSC, or EC clocks. Since REF-
CLK is only active when RFEN=1, it is not
a suitable source for CLKIN.
EXTERNAL CLOCK IN
RC OSCILLATOR
EXT
OSC
GP5/OSC1/
CLKIN
GP4/OSC2/CLKOUT
) and capacitor (C
/4.
RC OSCILLATOR MODE
PIC12F629/675
EXT
) values
Internal
Clock
Preliminary
10.2.5
When calibrated, the internal oscillator provides a fixed
4 MHz (nominal) system clock. See Electrical
Specifications,
variation over voltage and temperature.
Two options are available for this Oscillator mode
which allow GP4 to be used as a general purpose I/O
or to output F
10.2.5.1
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 10-1
demonstrates how to calibrate the internal oscillator.
For best operation, decouple (with capacitance) V
and V
EXAMPLE 10-1:
10.2.6
The rfPIC12F675 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
CLKOUT pin. F
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 rfPIC12F675 Programming
specification.
Tools maintain all calibration bits to factory
settings.
INTERNAL 4 MH
CLKOUT
STATUS, RP0
3FFh
OSCCAL
STATUS, RP0
OSC
Calibrating the Internal Oscillator
OSC
Section 13.0,
/4.
OSC
/4 can be used for test purposes or
/4) is output on the GP4/OSC2/
CALIBRATING THE
INTERNAL OSCILLATOR
 2003 Microchip Technology Inc.
Microchip
Z
;Bank 1
;Get the cal value
;Calibrate
;Bank 0
OSCILLATOR
for
information
Development
DD
on