参数资料
型号: SAX-XC878LM-13FFA5V
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP64
封装: GREEN, PLASTIC, LQFP-64
文件页数: 129/145页
文件大小: 2156K
代理商: SAX-XC878LM-13FFA5V
XC87xCLM
Functional Description
Data Sheet
77
V1.5, 2011-03
not be bypassed for this PLL mode. The PLL mode is used during normal system
operation.
(3.2)
System Frequency Selection
For the XC87x, the value of NF, NR and OD can be selected by bits NDIV, PDIV and
KDIV respectively for different oscillator inputs inorder to obtain the required fsys. But the
combination of these factors must fulfill the following condition:
100 MHz < fVCO <175 MHz
800 KHz < fOSC / (2 * NR) < 8 MHz
Table 26 provides examples on how the typical system frequency of fsys = 144 MHz
and maximum frequency of 160 MHz (CPU clock = 26.67 MHz)can be obtained for the
different oscillator sources.
3.8.1
Recommended External Oscillator Circuits
The oscillator circuit, a Pierce oscillator, is designed to work with both, an external crystal
oscillator or an external stable clock source. It basically consists of an inverting amplifier
and a feedback element with XTAL1 as input, and XTAL2 as output.
When using a crystal, a proper external oscillator circuitry must be connected to both
pins, XTAL1 and XTAL2. The crystal frequency can be within the range of 2 MHz to
20 MHz. Additionally, it is necessary to have two load capacitances
C
X1 and CX2, and
depending on the crystal type, a series resistor
R
X2, to limit the current. A test resistor RQ
may be temporarily inserted to measure the oscillation allowance (negative resistance)
of the oscillator circuitry.
R
Q values are typically specified by the crystal vendor. An
external feedback resistor
R
f is also required in the external oscillator circuitry. The exact
values and related operating range are dependent on the crystal frequency and have to
be determined and optimized together with the crystal vendor using the negative
Table 26
System frequency (
f
sys =144 MHz)
Oscillator
fosc
N
P
K
fsys
On-chip
4 MHz
72
2
1
144 MHz
4 MHz
80
2
1
160 MHz
External
8 MHz
72
4
1
144 MHz
6 MHz
72
3
1
144 MHz
4 MHz
72
2
1
144 MHz
OD
x
NR
NF
x
f
OSC
SYS =
相关PDF资料
PDF描述
SAF-XC878-13FFI5V 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP64
SAF-XC878CLM-16FFA5V 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP64
SB80960HD-33 32-BIT, 66 MHz, RISC PROCESSOR, PQFP208
SB80960HA-40 32-BIT, 40 MHz, RISC PROCESSOR, PQFP208
SB80960HA-25 32-BIT, 25 MHz, RISC PROCESSOR, PQFP208
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