SAK-XC2264-56F66L INFINEON [Infineon Technologies AG], SAK-XC2264-56F66L Datasheet - Page 86

• Manufacturer Part Number: SAK-XC2264-56F66L
• Description: 16/32-Bit Single-Chip Microcontroller with 32-Bit Performance
• Manufacturer: INFINEON [Infineon Technologies AG]

Preliminary
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 bitfields, to avoid unintended
intermediate states.
Many applications change the frequency of the system clock (
to optimize performance and power consumption of the system. Changing the operating
frequency also changes the consumed switching current, which influences the power
supply. Therefore, while the core voltage is generated by the on-chip EVRs, the
operating frequency may only be changed by factors of 5 maximum, or in steps of
20 MHz maximum, whatever condition is tighter.
To avoid the indicated problems, recommended sequences are provided which ensure
the intended operation of the clock system interacting with the power system.
4.4.2
Accesses to the XC226x’s Flash modules are controlled by the IMB.
Built-in prefetching mechanisms optimize the performance for sequential accesses.
Table 18
Parameter
Programming time per 128-byte page
Erase time per sector/page
1) Programming and erase times depend on the internal Flash clock source. The control state machine needs a
Data Sheet
few system clock cycles, which only becomes relevant for extremely low system frequencies.
On-chip Flash Operation
Flash Characteristics (Operating Conditions apply)
Symbol
t
t
PR
ER
84
CC –
CC –
Min.
XC2000 Family Derivatives
Limit Values
Typ.
3
4
f
SYS
1)
1)
Electrical Parameters
) during the operation,
XC2267 / XC2264
Max.
tbd
tbd
V0.1, 2007-02
Draft Version
Unit
ms
ms