參數(shù)資料
型號: PIC18F6620-E/PT
廠商: Microchip Technology
文件頁數(shù): 85/165頁
文件大?。?/td> 0K
描述: IC PIC MCU FLASH 32KX16 64TQFP
產品培訓模塊: Asynchronous Stimulus
標準包裝: 160
系列: PIC® 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 25MHz
連通性: I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,LVD,POR,PWM,WDT
輸入/輸出數(shù): 52
程序存儲器容量: 64KB(32K x 16)
程序存儲器類型: 閃存
EEPROM 大小: 1K x 8
RAM 容量: 3.75K x 8
電壓 - 電源 (Vcc/Vdd): 4.2 V ~ 5.5 V
數(shù)據(jù)轉換器: A/D 12x10b
振蕩器型: 外部
工作溫度: -40°C ~ 125°C
封裝/外殼: 64-TQFP
包裝: 托盤
PIC18F6520/8520/6620/8620/6720/8720
DS39609B-page 24
2004 Microchip Technology Inc.
2.6
Oscillator Switching Feature
The PIC18FXX20 devices include a feature that allows
the system clock source to be switched from the main
oscillator to an alternate low-frequency clock source.
For the PIC18FXX20 devices, this alternate clock
source is the Timer1 oscillator. If a low-frequency
crystal (32 kHz, for example) has been attached to the
Timer1 oscillator pins and the Timer1 oscillator has
been enabled, the device can switch to a low-power
execution mode. Figure 2-7 shows a block diagram of
the system clock sources. The clock switching feature
is enabled by programming the Oscillator Switching
Enable (OSCSEN) bit in Configuration Register 1H to a
‘0’. Clock switching is disabled in an erased device.
See Section 12.0 “Timer1 Module” for further details
of the Timer1 oscillator. See Section 23.0 “Special
Features of the CPU” for Configuration register
details.
FIGURE 2-7:
DEVICE CLOCK SOURCES
PIC18FXX20
TOSC
4 x PLL
TT1P
TSCLK
Clock
Source
MU
X
TOSC/4
Timer1 Oscillator
T1OSCEN
Enable
Oscillator
T1OSO
T1OSI
Clock Source Option
for other Modules
OSC1
OSC2
Sleep
Main Oscillator
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