參數(shù)資料
型號: MC56F8157
廠商: Electronic Theatre Controls, Inc.
英文描述: 16-BIT HYBRID CONTROLLERS
中文描述: 16位混合控制器
文件頁數(shù): 38/172頁
文件大小: 2444K
代理商: MC56F8157
56F8357 Technical Data, Rev. 8.0
38
Freescale Semiconductor
Preliminary
Part 3 On-Chip Clock Synthesis (OCCS)
3.1 Introduction
Refer to the OCCS chapter of the
56F8300 Peripheral User Manual
for a full description of the OCCS.
The material contained here identifies the specific features of the OCCS design.
Figure 3-1
shows the
specific OCCS block diagram to reference from the OCCS chapter of the
56F8300 Peripheral User
Manual
.
Figure 3-1 OCCS Block Diagram
3.2 External Clock Operation
The system clock can be derived from an external crystal, ceramic resonator, or an external system clock
signal. To generate a reference frequency using the internal oscillator, a reference crystal or ceramic
resonator must be connected between the EXTAL and XTAL pins.
3.2.1
Crystal Oscillator
The internal oscillator is also designed to interface with a parallel-resonant crystal resonator in the
frequency range specified for the external crystal in
Table 10-13
. A recommended crystal oscillator circuit
is shown in
Figure 3-2
. Follow the crystal supplier’s recommendations when selecting a crystal, since
M
EXTAL
XTAL
F
LCK
Prescaler CLK
Postscaler CLK
F
OUT/2
Crystal
OSC
Loss of
Reference
Clock
Detector
Lock
Detector
ZSRC
Bus Interface & Control
F
OUT
F
R
PLLDB
PLLCOD
PLLCID
Bus
Interface
Loss of Reference
Clock Interrupt
SYS_CLK2
Source to SIM
M
CLKMODE
÷
2
Prescaler
÷
(
1,2,4,8
)
Postscaler
÷
(
1,2,4,8
)
M
PLL
x (1 to 128)
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