参数资料
型号: SAF-XC886C-8FFI3V3
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, PQFP48
封装: PLASTIC, TQFP-48
文件页数: 128/144页
文件大小: 1455K
代理商: SAF-XC886C-8FFI3V3
XC886/888CLM
Functional Description
Data Sheet
77
V1.2, 2009-07
3.8.2
Clock Management
The CGU generates all clock signals required within the microcontroller from a single
clock,
f
sys. During normal system operation, the typical frequencies of the different
modules are as follow:
CPU clock: CCLK, SCLK = 24 MHz
Fast clock (used by MultiCAN): FCLK = 24 or 48 MHz
Peripheral clock: PCLK = 24 MHz
Flash Interface clock: CCLK2 = 48 MHz and CCLK = 24 MHz
In addition, different clock frequencies can be output to pin CLKOUT (P0.0 or P0.7). The
clock output frequency, which is derived from the clock output divider (bit COREL), can
further be divided by 2 using toggle latch (bit TLEN is set to 1). The resulting output
frequency has a 50% duty cycle. Figure 26 shows the clock distribution of the
XC886/888.
Figure 26
Clock Generation from
f
sys
PLL
N,P,K
fsys=
96MHz
CLKREL
CCLK
SCLK
PCLK
CCLK2
CORE
Peripherals
FLASH
Interface
OSC
CLKOUT
fosc
COREL
COUTS
Toggle
Latch
TLEN
/2
MultiCAN
FCLK
FCCFG
/2
SD
0
1
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