參數(shù)資料
型號(hào)： PIC12F505
廠商： Microchip Technology Inc.
元件分類： 8位微控制器
英文描述： 8/14-Pin, 8-Bit Flash Microcontrollers
中文描述： 8/14-Pin，8位閃存微控制器
文件頁(yè)數(shù)： 45/100頁(yè)
文件大?。?/td> 741K
代理商： PIC12F505
2007 Microchip Technology Inc.
Preliminary
DS41236C-page 43
PIC12F508/509/16F505
Although the oscillator will operate with no external
capacitor (C
EXT
=
0
pF), we recommend using values
above 20 pF for noise and stability reasons. With no or
small external capacitance, the oscillation frequency
can vary dramatically due to changes in external
capacitances, such as PCB trace capacitance or
package lead frame capacitance.
Section 10.0 “Electrical Characteristics”
shows RC
frequency variation from part-to-part due to normal
process variation. The variation is larger for larger val-
ues of R (since leakage current variation will affect RC
frequency more for large R) and for smaller values of C
(since variation of input capacitance will affect RC
frequency more).
Also, see the Electrical Specifications section for
variation of oscillator frequency due to V
DD
for given
R
EXT
/C
EXT
values, as well as frequency variation due
to operating temperature for given R, C and V
DD
values.
FIGURE 7-5:
EXTERNAL RC
OSCILLATOR MODE
7.2.5
INTERNAL 4 MHz RC OSCILLATOR
The internal RC oscillator provides a fixed 4 MHz (nom-
inal) system clock at V
DD
= 5V and 25°C, (see
Section 10.0
“Electrical
information on variation over voltage and temperature).
Characteristics”
for
In addition, a calibration instruction is programmed into
the last address of memory, which contains the calibra-
tion value for the internal RC oscillator. This location is
always uncode protected, regardless of the code-pro-
tect settings. This value is programmed as a
MOVLW XX
instruction where
XX
is the calibration value, and is
placed at the Reset vector. This will load the W register
with the calibration value upon Reset and the PC will
then roll over to the users program at address 0x000.
The user then has the option of writing the value to the
OSCCAL Register (05h) or ignoring it.
OSCCAL, when written to with the calibration value, will
“trim” the internal oscillator to remove process variation
from the oscillator frequency.
For the PIC12F508/509/16F505 devices, only bits
<7:1> of OSCCAL are implemented. Bits CAL6-CAL0
are used for calibration. Adjusting CAL6-CAL0 from
‘
0000000
’ to ‘
1111111
’ changes the clock speed. See
Register 4-5 for more information.
V
DD
R
EXT
C
EXT
V
SS
OSC1
Internal
clock
PIC16F505
PIC12F508
PIC12F509
N
F
OSC
/4
OSC2/CLKOUT
Note:
Erasing the device will also erase the pre-
programmed internal calibration value for
the internal oscillator. The calibration
value must be read prior to erasing the
part so it can be reprogrammed correctly
later.
Note:
The
0
bit of OSCCAL is unimplemented
and should be written as ‘
0
’ when modify-
ing OSCCAL for compatibility with future
devices.
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