参数资料
型号: MC9S12GC64PCPB25
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP52
封装: LQFP-52
文件页数: 16/138页
文件大小: 2318K
代理商: MC9S12GC64PCPB25
Device User Guide — 9S12C128DGV1/D V01.07
110
B.6.1.4 External Reset
When external reset is asserted for a time greater than PWRSTL the CRG module generates an internal
reset, and the CPU starts fetching the reset vector without doing a clock quality check, if there was an
oscillation before reset.
B.6.1.5 Stop Recovery
Out of STOP the controller can be woken up by an external interrupt. A clock quality check as after POR
is performed before releasing the clocks to the system.
B.6.1.6 Pseudo Stop and Wait Recovery
The recovery from Pseudo STOP and Wait are essentially the same since the oscillator was not stopped in
both modes. In Pseudo Stop Mode the voltage regulator is switched to reduced performance mode to
reduce power consumption. The returning out of pseudo stop to full perfomance takes tvup. The controller
can be woken up by internal or external interrupts.After twrs in Wait or tvup+twrs in Pseudo Stop the CPU
starts fetching the interrupt vector.
B.6.2 Oscillator
The device features an internal Colpitts and Pierce oscillator. The selection of Colpitts oscillator or Pierce
oscillator/external clock depends on the XCLKS signal which is sampled during reset. Pierce
oscillator/external clock mode allows the input of a square wave. Before asserting the oscillator to the
internal system clocks the quality of the oscillation is checked for each start from either power-on, STOP
or oscillator fail. tCQOUT specifies the maximum time before switching to the internal self clock mode after
POR or STOP if a proper oscillation is not detected. The quality check also determines the minimum
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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