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參數(shù)資料
| 型號： | XC866L-4RR |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| 中文描述： | 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存 |
| 文件頁數(shù)： | 57/108頁 |
| 文件大?。?/td> | 979K |
| 代理商： | XC866L-4RR |
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XC866
Functional Description
Data Sheet
53
V1.0, 2006-02
Direct Drive (PLL Bypass Operation)
During PLL bypass operation, the system clock has the same frequency as the external
clock source. For the XC866, the PLL bypass cannot be set active. Hence, the direct
drive mode is not available for use.
PLL Base Mode
The system clock is derived from the VCO base frequency clock divided by the K factor.
Both VCO bypass and PLL bypass must be inactive for this PLL mode.
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. .
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, f
sys
, the value of N can be selected by bit NDIV
for different oscillator inputs.
Table 18
provides examples on how f
sys
= 80 MHz can be
obtained for the different oscillator sources.
Table 18
System frequency (f
sys
= 80 MHz)
fosc
10 MHz
Oscillator
On-chip
N
16
P
1
K
2
fsys
80 MHz
f
SYS
f
OSC
=
f
SYS
f
VCObase
1
K
---
×
=
f
SYS
f
OSC
×
P
K
----1
×
=
f
SYS
f
OSC
×
P
K
---N
×
=
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