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XC68HC912D60FU8 参数 Datasheet PDF下载

XC68HC912D60FU8图片预览
型号: XC68HC912D60FU8
PDF下载: 下载PDF文件 查看货源
内容描述: 超前信息 - 冯4.0 [Advance Information - Rev 4.0]
分类和应用: 微控制器和处理器外围集成电路时钟
文件页数/大小: 432 页 / 2948 K
品牌: MOTOROLA [ MOTOROLA ]
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Freescale Semiconductor, Inc.  
Clock Functions  
Limp-Home and Fast STOP Recovery modes  
. .  
Table 12-1. Summary of STOP Mode Exit Conditions  
Mode  
Conditions  
Summary  
STOP exit without Limp Home  
mode,  
NOLHM=1  
CME=0  
Oscillator must be stable within 4096 XCLK cycles. XCLK  
can be modified by SLOW divider register.  
clock monitor disabled  
DLY=X  
Use of DLY=0 only recommended with external clock.  
Executing the STOP instruction  
without Limp Home mode,  
clock monitor enabled  
NOLHM=1  
CME=1  
DLY=X  
When a STOP instruction is executed the MCU resets via  
the clock monitor reset vector.  
Oscillator must be stable within 4096  
NOLHM=0  
CME=X  
DLY=1  
f
cycles or there is a possibility of code runaway as  
STOP exit in Limp Home mode  
with Delay  
VCOMIN  
the clock monitor circuit can be misled by EXTALi clock  
into reporting a good signal before it has fully stabilised  
STOP exit in Limp Home mode  
without Delay (Fast Stop  
Recovery)  
NOLHM=0  
CME=X  
DLY=0  
This mode is only recommended for use with an external  
clock source.  
Table 12-2. Summary of Pseudo STOP Mode Exit Conditions  
Mode  
Conditions  
Summary  
CPU exits stop in limp home mode and oscillator running. If  
the oscillator fails during pseudo-STOP and then recovers  
there is a possibility of code runaway as the clock monitor  
circuit can be misled by EXTALi clock into reporting a  
good signal before it has fully stabilised  
NOLHM=0  
CME=X  
DLY=1  
Pseudo-STOP exit in Limp Home  
mode with Delay  
Pseudo-STOP exit  
in Limp Home mode without  
Delay (Fast Stop Recovery)  
NOLHM=0  
CME=X  
DLY=0  
This mode is not recommended as it is possible that the  
initial VCO clock frequency may be high enough to cause  
code runaway.  
Pseudo-STOP exit without Limp  
Home mode, clock monitor  
enabled  
NOLHM=1  
CME=1  
DLY=X  
When a STOP instruction is executed the MCU resets via  
the clock monitor reset vector.  
Pseudo-STOP exit without Limp  
Home mode, clock monitor  
disabled, with Delay  
NOLHM=1  
CME=0  
DLY=1  
Oscillator starts operation following 4096 XCLK cycles  
(actual controlled by SLOW mode divider).  
Pseudo-STOP exit without Limp  
Home mode, clock monitor  
disabled, without Delay  
NOLHM=1  
CME=0  
DLY=0  
This mode is only recommended for use with an external  
clock source.  
68HC(9)12D60 — Rev 4.0  
MOTOROLA  
Advance Information  
Clock Functions  
161  
For More Information On This Product,  
Go to: www.freescale.com  
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