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| 型号： | PIC16F54T-I/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 16/88页 |
| 文件大小： | 0K |
| 描述： | IC MCU FLASH 512X12 20SSOP |
| 产品培训模块： | Asynchronous Stimulus |
| 标准包装： | 1,600 |
| 系列： | PIC® 16F |
| 核心处理器： | PIC |
| 芯体尺寸： | 8-位 |
| 速度： | 20MHz |
| 外围设备： | POR，WDT |
| 输入/输出数： | 12 |
| 程序存储器容量： | 768B（512 x 12） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 25 x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2 V ~ 5.5 V |
| 振荡器型： | 外部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-SSOP（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
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2007 Microchip Technology Inc.
DS41213D-page 21
PIC16F5X
4.0
OSCILLATOR
CONFIGURATIONS
4.1
Oscillator Types
The PIC16F5X devices can be operated in four differ-
ent oscillator modes. The user can program two Con-
figuration bits (FOSC1:FOSC0) to select one of these
four modes:
LP:
Low-power Crystal
XT:
Crystal/Resonator
HS:
High-speed Crystal/Resonator
RC:
Resistor/Capacitor
4.2
Crystal Oscillator/Ceramic
Resonators
In XT, LP or HS modes, a crystal or ceramic resonator
is connected to the OSC1/CLKIN and OSC2/CLKOUT
pins
to
establish
oscillation
(Figure 4-1).
The
PIC16F5X oscillator design requires the use of a
parallel cut crystal. Use of a series cut crystal may give
a frequency outside of the crystal manufacturers
specifications. When in XT, LP or HS modes, the
device can have an external clock source drive the
OSC1/CLKIN pin (Figure 4-2).
FIGURE 4-1:
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP OSC
CONFIGURATION)
FIGURE 4-2:
EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR LP
OSC CONFIGURATION)
TABLE 4-1:
CAPACITOR SELECTION FOR
CERAMIC RESONATORS
TABLE 4-2:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
Note
1:
See Capacitor Selection tables for
recommended values of C1 and C2.
2:
A series resistor (RS) may be required.
3:
RF varies with the Oscillator mode chosen
(approx. value = 10 M
Ω).
C1(1)
C2(1)
XTAL
OSC2
OSC1
RF(3)
Sleep
To internal
logic
RS(2)
PIC16F5X
Clock from
ext. system
OSC1
OSC2
Open
PIC16F5X
Osc
Type
Resonator
Freq.
Cap. Range
C1
Cap. Range
C2
XT
455 kHz
2.0 MHz
4.0 MHz
68-100 pF
15-33 pF
10-22 pF
68-100 pF
15-33 pF
10-22 pF
HS
8.0 MHz
16.0 MHz
10-22 pF
10 pF
10-22 pF
10 pF
These values are for design guidance only. Since
each resonator has its own characteristics, the user
should consult the resonator manufacturer for
appropriate values of external components.
Osc
Type
Crystal
Freq.
Cap.Range
C1
Cap. Range
C2
LP
32 kHz(1)
15 pF
XT
100 kHz
200 kHz
455 kHz
1MHz
2MHz
4MHz
15-30 pF
15 pF
200-300 pF
100-200 pF
15-100 pF
15-30 pF
15 pF
HS
4 MHz
8MHz
20 MHz
15 pF
Note 1:
For VDD > 4.5V, C1 = C2
≈ 30 pF is
recommended.
These values are for design guidance only. Rs may
be required in HS mode, as well as XT mode, to
avoid overdriving crystals with low drive level specifi-
cations. Since each crystal has its own characteris-
tics, the user should consult the crystal manufacturer
for appropriate values of external components.
Note 1: This device has been designed to perform
to the parameters of its data sheet. It has
been tested to an electrical specification
designed to determine its conformance
with these parameters. Due to process
differences in the manufacture of this
device, this device may have different
performance
characteristics
than
its
earlier version. These differences may
cause this device to perform differently in
your application than the earlier version of
this device.
2: The user should verify that the device
oscillator
starts
and
performs
as
expected. Adjusting the loading capacitor
values and/or the Oscillator mode may be
required.
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