參數(shù)資料
型號: MC56F8323
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: 16-bit Hybrid Controller(16位混合控制器)
中文描述: 16位混合控制器(16位混合控制器)
文件頁數(shù): 25/132頁
文件大?。?/td> 2202K
代理商: MC56F8323
Internal Clock Operation
56F8323 Technical Data
Preliminary
25
value of this trim is 512 units. Each unit added or deleted changes the output frequency by about
0.1%, allowing incremental adjustment until the desired frequency accuracy is achieved.
The internal oscillator is calibrated at the factory to 8MHz and the TRIM value is stored in the
Flash information block and loaded to the FMIFROPT1 register at reset. For further information,
see the
56F8300 Peripherals User Manual
.
When using the relaxation oscillator, the boot code should read the FMOPT1 register and set this
value as OSCTL TRIM.
3.4 Internal Clock Operation
At reset, both oscillators will be powered up; however, the relaxation oscillator will be the default
clock reference for the PLL. Software should power down the block not being used and program
the PLL for the correct frequency.
Figure 3-4 Internal Clock Operation
Crystal
OSC
Relaxation
OSC
CLK_MODE
XTAL
EXTA
M
MUX
PRECS
PLLCID
PLL
(X 1 - 128)
Postscaler
(
÷
1, 2, 4, 8)
÷
2
Prescaler
(
÷
1, 2, 4, 8)
Lock
Detector
Loss of
Reference
Clock
Detector
M
SYS_CLK2
source to
the SIM
Postscaler CLK
PLLDB
PLLCOD
LCK
Bus Interface
& Control
Bus
Interface
F
F
loss of reference
clock interrupt
M
F
OUT
F
OUT
/2
ZSRC
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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