参数资料
型号: SAF-XC866-2FRA
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 26.7 MHz, MICROCONTROLLER, PDSO38
封装: PLASTIC, GREEN, TSSOP-38
文件页数: 76/116页
文件大小: 1640K
代理商: SAF-XC866-2FRA
XC866
Functional Description
Data Sheet
58
V1.2, 2007-10
The clock system provides three ways to generate the system clock:
PLL Base Mode
The system clock is derived from the VCO base (free running) frequency clock divided
by the K factor.
Prescaler Mode (VCO Bypass Operation)
In VCO bypass operation, the system clock is derived from the oscillator clock, divided
by the P and K factors.
PLL Mode
The system clock is derived from the oscillator clock, multiplied by the N factor, and
divided by the P and K factors. Both VCO bypass and PLL bypass must be inactive for
this PLL mode. The PLL mode is used during normal system operation. .
Table 3-1 shows the settings of bits OSCDISC and VCOBYP for different clock mode
selection.
Note: When oscillator clock is disconnected from PLL, the clock mode is PLL Base mode
regardless of the setting of VCOBYP bit.
System Frequency Selection
For the XC866, the values of P and K are fixed to “1” and “2”, respectively. In order to
obtain the required system frequency, fsys, the value of N can be selected by bit NDIV
for different oscillator inputs. Table 21 provides examples on how fsys = 80 MHz can be
obtained for the different oscillator sources.
Table 3-1
Clock Mode Selection
OSCDISC
VCOBYP
Clock Working Modes
0
PLL Mode
01
Prescaler Mode
1
0
PLL Base Mode
1
PLL Base Mode
fSYS
fVCObase
1
K
----
×
=
fSYS
fOSC
1
PK
×
-------------
×
=
fSYS
fOSC
N
PK
×
-------------
×
=
相关PDF资料
PDF描述
SAF-XC866-2RRI 8-BIT, FLASH, 26.7 MHz, MICROCONTROLLER, PDSO38
SAF-XC866-4FRA3V 8-BIT, FLASH, 26.7 MHz, MICROCONTROLLER, PDSO38
SAF-XC866-4FRA 8-BIT, FLASH, 26.7 MHz, MICROCONTROLLER, PDSO38
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