参数资料
型号: SAK-XC2289H-200F80L
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 80 MHz, RISC MICROCONTROLLER, PQFP144
封装: 0.50 MM PITCH, GREEN, PLASTIC, LQFP-144
文件页数: 17/149页
文件大小: 1813K
代理商: SAK-XC2289H-200F80L
XC2288H, XC2289H
XC2000 Family Derivatives / High Line
Electrical Parameters
Data Sheet
113
V1.2, 2010-09
4.7.2
Definition of Internal Timing
The internal operation of the XC228xH is controlled by the internal system clock
f
SYS.
Because the system clock signal
f
SYS can be generated from a number of internal and
external sources using different mechanisms, the duration of the system clock periods
(TCSs) and their variation (as well as the derived external timing) depend on the
mechanism used to generate
f
SYS. This must be considered when calculating the timing
for the XC228xH.
Figure 19
Generation Mechanisms for the System Clock
Note: The example of PLL operation shown in Figure 19 uses a PLL factor of 1:4; the
example of prescaler operation uses a divider factor of 2:1.
The specification of the external timing (AC Characteristics) depends on the period of the
system clock (TCS).
M C_XC2X_CLOCKGEN
Phase Locked Loop Operation (1:N)
f
IN
Direct Clock Drive (1:1)
Prescaler Operation (N:1)
f
SYS
f
IN
f
SYS
f
IN
f
SYS
TCS
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