参数资料
型号: PIC18F8720T-E/PT
厂商: Microchip Technology
文件页数: 86/165页
文件大小: 0K
描述: IC PIC MCU FLASH 64KX16 80TQFP
标准包装: 1,200
系列: PIC® 18F
核心处理器: PIC
芯体尺寸: 8-位
速度: 25MHz
连通性: EBI/EMI,I²C,SPI,UART/USART
外围设备: 欠压检测/复位,LVD,POR,PWM,WDT
输入/输出数: 68
程序存储器容量: 128KB(64K x 16)
程序存储器类型: 闪存
EEPROM 大小: 1K x 8
RAM 容量: 3.75K x 8
电压 - 电源 (Vcc/Vdd): 4.2 V ~ 5.5 V
数据转换器: A/D 16x10b
振荡器型: 外部
工作温度: -40°C ~ 125°C
封装/外壳: 80-TQFP
包装: 带卷 (TR)
配用: XLT80PT3-ND - SOCKET TRAN ICE 80MQFP/TQFP
AC164320-ND - MODULE SKT MPLAB PM3 80TQFP
AC174011-ND - MODULE SKT PROMATEII 80TQFP
2004 Microchip Technology Inc.
DS39609B-page 25
PIC18F6520/8520/6620/8620/6720/8720
2.6.1
SYSTEM CLOCK SWITCH BIT
The system clock source switching is performed under
software control. The system clock switch bit, SCS
(OSCCON<0>), controls the clock switching. When the
SCS bit is ‘0’, the system clock source comes from the
main oscillator that is selected by the FOSC configura-
tion bits in Configuration Register 1H. When the SCS
bit is set, the system clock source will come from the
Timer1 oscillator. The SCS bit is cleared on all forms of
Reset.
REGISTER 2-1:
OSCCON REGISTER
Note:
The Timer1 oscillator must be enabled
and operating to switch the system clock
source. The Timer1 oscillator is enabled
by setting the T1OSCEN bit in the Timer1
Control register (T1CON). If the Timer1
oscillator is not enabled, then any write to
the SCS bit will be ignored (SCS bit forced
cleared) and the main oscillator will
continue to be the system clock source.
U-0
R/W-1
—SCS
bit 7
bit 0
bit 7-1
Unimplemented: Read as ‘0’
bit 0
SCS: System Clock Switch bit
When OSCSEN Configuration bit = 0 and T1OSCEN bit is set:
1
= Switch to Timer1 oscillator/clock pin
0
= Use primary oscillator/clock input pin
When OSCSEN and T1OSCEN are in other states:
Bit is forced clear.
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
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