參數(shù)資料
型號(hào): MCL908QT1
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: M68HC08 Microcontrollers
中文描述: M68HC08系列微控制器
文件頁(yè)數(shù): 91/182頁(yè)
文件大小: 1603K
代理商: MCL908QT1
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Functional Description
MC68HLC908QY/QT Family Data Sheet, Rev. 3
Freescale Semiconductor
91
11.3.1.1 Internal Oscillator Trimming
The 8-bit trimming register, OSCTRIM, allows a clock period adjust of +127 and –128 steps. Increasing
OSCTRIM value increases the clock period. Trimming allows the internal clock frequency to be set to
4.0 MHz ±5%.
All devices are programmed with a trim value in a reserved FLASH location, $FFC0. This value can be
copied from the FLASH to the OSCTRIM register ($0038) during reset initialization.
Reset loads OSCTRIM with a default value of $80.
WARNING
Bulk FLASH erasure will set location $FFC0 to $FF and the factory
programmed value will be lost.
11.3.1.2 Internal to External Clock Switching
When external clock source (external OSC, RC, or XTAL) is desired, the user must perform the following
steps:
1.
For external crystal circuits only, OSCOPT[1:0] = 1:1: To help precharge an external crystal
oscillator, set PTA4 (OSC2) as an output and drive high for several cycles. This may help the
crystal circuit start more robustly.
2.
Set CONFIG2 bits OSCOPT[1:0] according to . The oscillator module control logic will then set
OSC1 as an external clock input and, if the external crystal option is selected, OSC2 will also be
set as the clock output.
3.
Create a software delay to wait the stabilization time needed for the selected clock source (crystal,
resonator, RC) as recommended by the component manufacturer. A good rule of thumb for crystal
oscillators is to wait 4096 cycles of the crystal frequency, i.e., for a 4-MHz crystal, wait
approximately 1 msec.
4.
After the manufacturer’s recommended delay has elapsed, the ECGON bit in the OSC status
register (OSCSTAT) needs to be set by the user software.
5.
After ECGON set is detected, the OSC module checks for oscillator activity by waiting two external
clock rising edges.
6.
The OSC module then switches to the external clock. Logic provides a glitch free transition.
7.
The OSC module first sets the ECGST bit in the OSCSTAT register and then stops the internal
oscillator.
NOTE
Once transition to the external clock is done, the internal oscillator will only
be reactivated with reset. No post-switch clock monitor feature is
implemented (clock does not switch back to internal if external clock dies).
11.3.2 External Oscillator
The external clock option is designed for use when a clock signal is available in the application to provide
a clock source to the microcontroller. The OSC1 pin is enabled as an input by the oscillator module. The
clock signal is used directly to create BUSCLKX4 and also divided by two to create BUSCLKX2.
In this configuration, the OSC2 pin cannot output BUSCLKX4. So the OSC2EN bit in the port A pullup
enable register will be clear to enable PTA4 I/O functions on the pin.
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參數(shù)描述
MCL908QT1CDWE 功能描述:8位微控制器 -MCU LO V-1.5K FLASH W/O AD RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MCL908QT1CDWER 功能描述:8位微控制器 -MCU LO V-1.5K FLASH W/O ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MCL908QT1DWE 功能描述:8位微控制器 -MCU LO V-1.5K FLASH W/O ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
MCL908QT2 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers
MCL908QT2CDWE 功能描述:8位微控制器 -MCU LO V-1.5K FLASH W/ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT