參數(shù)資料
型號： AT90S8535-8PI
廠商： Atmel
文件頁數(shù)： 72/127頁
文件大?。?/td> 0K
描述： IC MCU 8K FLSH 8MHZ A/D IT 40DIP
標(biāo)準(zhǔn)包裝： 18
系列： AVR® 90S
核心處理器： AVR
芯體尺寸： 8-位
速度： 8MHz
連通性： SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 8KB（4K x 16）
程序存儲器類型： 閃存
EEPROM 大?。?/td> 512 x 8
RAM 容量： 512 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 40-DIP（0.600"，15.24mm）
包裝： 管件
1997 Microchip Technology Inc.
DS30272A-page 49
PIC16C71X
8.2
Oscillator Congurations
8.2.1
OSCILLATOR TYPES
The PIC16CXX can be operated in four different oscil-
lator modes. The user can program two conguration
bits (FOSC1 and FOSC0) to select one of these four
modes:
LP
Low Power Crystal
XT
Crystal/Resonator
HS
High Speed Crystal/Resonator
RC
Resistor/Capacitor
8.2.2
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
The
PIC16CXX Oscillator design requires the use of a par-
allel cut crystal. Use of a series cut crystal may give a
frequency out of the crystal manufacturers specica-
tions. When in XT, LP or HS modes, the device can
have an external clock source to drive the OSC1/
CLKIN pin (Figure 8-5).
FIGURE 8-4:
CRYSTAL/CERAMIC
RESONATOR OPERATION
(HS, XT OR LP
OSC CONFIGURATION)
FIGURE 8-5:
EXTERNAL CLOCK INPUT
OPERATION (HS, XT OR LP
OSC CONFIGURATION)
C1
C2
XTAL
OSC2
Note1
OSC1
RF
SLEEP
PIC16CXXX
RS
See Table 8-1 and Table 8-1 for recommended values of
C1 and C2.
Note 1:
A series resistor may be required for AT strip
cut crystals.
2:
The buffer is on the OSC2 pin.
(2)
To internal
logic
OSC1
OSC2
Open
Clock from
ext. system
PIC16CXXX
TABLE 8-1:
CERAMIC RESONATORS,
PIC16C71
TABLE 8-2:
CAPACITOR SELECTION
FOR CRYSTAL OSCILLATOR,
PIC16C71
Ranges Tested:
Mode
Freq
OSC1
OSC2
XT
455 kHz
2.0 MHz
4.0 MHz
47 - 100 pF
15 - 68 pF
47 - 100 pF
15 - 68 pF
HS
8.0 MHz
16.0 MHz
15 - 68 pF
10 - 47 pF
15 - 68 pF
10 - 47 pF
These values are for design guidance only. See
notes at bottom of page.
Resonators Used:
455 kHz
Panasonic EFO-A455K04B
± 0.3%
2.0 MHz
Murata Erie CSA2.00MG
± 0.5%
4.0 MHz
Murata Erie CSA4.00MG
± 0.5%
8.0 MHz
Murata Erie CSA8.00MT
± 0.5%
16.0 MHz Murata Erie CSA16.00MX
± 0.5%
All resonators used did not have built-in capacitors.
Mode
Freq
OSC1
OSC2
LP
32 kHz
200 kHz
33 - 68 pF
15 - 47 pF
33 - 68 pF
15 - 47 pF
XT
100 kHz
500 kHz
1 MHz
2 MHz
4 MHz
47 - 100 pF
20 - 68 pF
15 - 68 pF
15 - 47 pF
15 - 33 pF
47 - 100 pF
20 - 68 pF
15 - 68 pF
15 - 47 pF
15 - 33 pF
HS
8 MHz
20 MHz
15 - 47 pF
These values are for design guidance only. See
notes at bottom of page.
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