参数资料
型号: PIC18F458T-I/PT
厂商: Microchip Technology
文件页数: 21/116页
文件大小: 0K
描述: IC MCU FLASH 16KX16 W/CAN 44TQFP
产品培训模块: Asynchronous Stimulus
标准包装: 1,200
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 40MHz
连通性: CAN,I²C,SPI,UART/USART
外围设备: 欠压检测/复位,LVD,POR,PWM,WDT
输入/输出数: 33
程序存储器容量: 32KB(16K x 16)
程序存储器类型: 闪存
EEPROM 大小: 256 x 8
RAM 容量: 1.5K x 8
电压 - 电源 (Vcc/Vdd): 4.2 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-TQFP
包装: 带卷 (TR)
PIC18FXX8
DS41159E-page 18
2006 Microchip Technology Inc.
TABLE 2-2:
CAPACITOR SELECTION FOR
CRYSTAL OSCILLATOR
2.3
RC Oscillator
For timing insensitive applications, the “RC” and “RCIO”
device options offer additional cost savings. The RC
oscillator frequency is a function of the supply voltage,
the resistor (REXT) and capacitor (CEXT) values and the
operating temperature. In addition to this, the oscillator
frequency will vary from unit to unit due to normal
process parameter variation. Furthermore, the differ-
ence in lead frame capacitance between package types
will also affect the oscillation frequency, especially for
low CEXT values. The user also needs to take into
account variation due to tolerance of external R and C
components used. Figure 2-2 shows how the RC
combination is connected.
In the RC Oscillator mode, the oscillator frequency
divided by 4 is available on the OSC2 pin. This signal
may be used for test purposes or to synchronize other
logic.
FIGURE 2-2:
RC OSCILLATOR MODE
The RCIO Oscillator mode functions like the RC mode,
except that the OSC2 pin becomes an additional
general purpose I/O pin. The I/O pin becomes bit 6 of
PORTA (RA6).
Osc Type
Crystal
Freq
Cap. Range
C1
Cap. Range
C2
LP
32.0 kHz
33 pF
200 kHz
15 pF
XT
200 kHz
47-68 pF
1.0 MHz
15 pF
4.0 MHz
15 pF
HS
4.0 MHz
15 pF
8.0 MHz
15-33 pF
20.0 MHz
15-33 pF
25.0 MHz
15-33 pF
These values are for design guidance only.
See notes on this page.
Crystals Used
32.0 kHz
Epson C-001R32.768K-A
±20 PPM
200 kHz
STD XTL 200.000KHz
±20 PPM
1.0 MHz
ECS ECS-10-13-1
±50 PPM
4.0 MHz
ECS ECS-40-20-1
±50 PPM
8.0 MHz
EPSON CA-301 8.000M-C
±30 PPM
20.0 MHz
EPSON CA-301 20.000M-C
±30 PPM
Note 1: Recommended values of C1 and C2 are
identical to the ranges tested (Table 2-1).
2: Higher capacitance increases the stability
of the oscillator but also increases the
start-up time.
3: Since each resonator/crystal has its own
characteristics, the user should consult
the resonator/crystal manufacturer for
appropriate
values
of
external
components.
4: Rs may be required in HS mode, as well
as XT mode, to avoid overdriving crystals
with low drive level specification.
Note:
If the oscillator frequency divided by 4
signal is not required in the application, it
is recommended to use RCIO mode to
save current.
OSC2/CLKO
CEXT
REXT
PIC18FXX8
OSC1
FOSC/4
Internal
Clock
VDD
VSS
Recommended values:
3 k
Ω ≤ REXT ≤ 100 kΩ
CEXT > 20 pF
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