參數(shù)資料
型號： PIC16C56A-20I/JW
元件分類： 微控制器/微處理器
英文描述： 8-BIT, UVPROM, 20 MHz, RISC MICROCONTROLLER, CDIP18
封裝： 0.300 INCH, WINDOWED, CERDIP-18
文件頁數(shù)： 86/158頁
文件大?。?/td> 1194K
代理商： PIC16C56A-20I/JW
2000 Microchip Technology Inc.
Preliminary
DS30453C-page 33
PIC16C5X
7.2
Oscillator Configurations
7.2.1
OSCILLATOR TYPES
PIC16C5Xs can be operated in four different oscillator
modes. The user can program two configuration bits
(FOSC<1:0>) to select one of these four modes:
LP:
Low Power Crystal
XT:
Crystal/Resonator
HS:
High Speed Crystal/Resonator
RC:
Resistor/Capacitor
7.2.2
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 7-3).
The
PIC16C5X oscillator design requires the use of a paral-
lel cut crystal. Use of a series cut crystal may give a fre-
quency out 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 7-4).
FIGURE 7-3:
CRYSTAL OPERATION
(OR CERAMIC RESONATOR)
(HS, XT OR LP OSC
CONFIGURATION)
Note:
Not all oscillator selections available for all
parts. See Section 7.1.
Note 1: See Capacitor Selection tables for
recommended values of C1 and C2.
2: A series resistor (RS) may be required for
AT strip cut crystals.
3: RF varies with the crystal chosen
(approx. value = 10 M
).
C1(1)
C2(1)
XTAL
OSC2
OSC1
RF(3)
SLEEP
To internal
logic
RS(2)
PIC16C5X
FIGURE 7-4:
EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR LP
OSC CONFIGURATION)
TABLE 7-1:
CAPACITOR SELECTION
FOR CERAMIC RESONATORS
- PIC16C5X, PIC16CR5X
TABLE 7-2:
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR
- PIC16C5X, PIC16CR5X
Osc
Type
Resonator
Freq
Cap. Range
C1
Cap. Range
C2
XT
455 kHz
2.0 MHz
4.0 MHz
22-100 pF
15-68 pF
22-100 pF
15-68 pF
HS
4.0 MHz
8.0 MHz
16.0 MHz
15-68 pF
10-68 pF
10-22 pF
15-68 pF
10-68 pF
10-22 pF
Note:
These values are for design guidance only.
Since each resonator has its own charac-
teristics, the user should consult the reso-
nator manufacturer for appropriate values
of external components.
Osc
Type
Resonator
Freq
Cap.Range
C1
Cap. Range
C2
LP
32 kHz(1)
100 kHz
200 kHz
15 pF
15-30 pF
15 pF
30-47 pF
15-82 pF
XT
100 kHz
200 kHz
455 kHz
1 MHz
2 MHz
4 MHz
15-30 pF
15-47 pF
200-300 pF
100-200 pF
15-100 pF
15-30 pF
15-47 pF
HS
4 MHz
8 MHz
20 MHz
15-30 pF
Note 1: For VDD > 4.5V, C1 = C2
≈ 30 pF is
recommended.
2: 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 specification. Since each
crystal has its own characteristics, the user
should consult the crystal manufacturer for
appropriate values of external components.
Note:
If you change from one device to another
device, please verify oscillator characteris-
tics in your application.
Clock from
ext. system
OSC1
OSC2
PIC16C5X
Open
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PIC16C56A-40/P 功能描述:8位微控制器 -MCU 1.5KB 25 RAM 12 I/O 40MHz PDIP18 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16C56A-40/SO 功能描述:8位微控制器 -MCU 1.5KB 25 RAM 12 I/O 40MHz SOIC18 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16C56A-40/SS 功能描述:8位微控制器 -MCU 1.5KB 25 RAM 12 I/O 40MHz SSOP20 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
PIC16C56AT-04/SO 功能描述:8位微控制器 -MCU 1.5KB 25 RAM 12 I/O 4 MHz SOIC18 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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