參數資料
型號: SAF-XC2785X-104F80L
廠商: INFINEON TECHNOLOGIES AG
元件分類: 微控制器/微處理器
英文描述: 32-BIT, FLASH, 80 MHz, RISC MICROCONTROLLER, PQFP144
封裝: 0.50 MM PITCH, GREEN, PLASTIC, LQFP-144
文件頁數: 14/141頁
文件大?。?/td> 1793K
代理商: SAF-XC2785X-104F80L
XC2785X
XC2000 Family / Base Line
Electrical Parameters
Data Sheet
110
V2.1, 2011-07
PLL frequency band selection
Different frequency bands can be selected for the VCO so that the operation of the PLL
can be adjusted to a wide range of input and output frequencies:
4.6.2.2
Wakeup Clock
When wakeup operation is selected (SYSCON0.CLKSEL = 00
B), the system clock is
derived from the low-frequency wakeup clock source:
f
SYS = fWU.
In this mode, a basic functionality can be maintained without requiring an external clock
source and while minimizing the power consumption.
4.6.2.3
Selecting and Changing the Operating Frequency
When selecting a clock source and the clock generation method, the required
parameters must be carefully written to the respective bit fields, to avoid unintended
intermediate states.
Many applications change the frequency of the system clock (
f
SYS) during operation in
order to optimize system performance and power consumption. Changing the operating
frequency also changes the switching currents, which influences the power supply.
To ensure proper operation of the on-chip EVRs while they generate the core voltage,
the operating frequency shall only be changed in certain steps. This prevents overshoots
and undershoots of the supply voltage.
To avoid the indicated problems, recommended sequences are provided which ensure
the intended operation of the clock system interacting with the power system.
Please refer to the Programmer’s Guide.
Table 24
System PLL Parameters
Parameter
Symbol
Values
Unit
Note /
Test Condition
Min.
Typ.
Max.
VCO output frequency
(VCO controlled)
f
VCO CC
50
110
MHz
VCOSEL = 00
B
100
160
MHz
VCOSEL = 01
B
VCO output frequency
(VCO free-running)
f
VCO CC
10
40
MHz
VCOSEL = 00
B
20
80
MHz
VCOSEL = 01
B
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