參數(shù)資料
型號(hào): MC68HC908QF4
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): 93/196頁(yè)
文件大?。?/td> 1547K
代理商: MC68HC908QF4
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Oscillator Module (OSC)
Functional Description
MC68HC908QF4 — Rev. 1.0
Data Sheet
MOTOROLA
Oscillator Module (OSC)
93
Figure 11-3
shows how BUSCLKX4 is derived from INTCLK and, like the RC
oscillator, OSC2 can output BUSCLKX4 by setting OSC2EN in PTAPUE register.
See
Section 13. Input/Output (I/O) Ports
.
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
11.7 CONFIG2 Options
. 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).
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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MC68HC908QT1CDW 功能描述:8位微控制器 -MCU 8 Bit 8MHz 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
MC68HC908QT1CDWE 制造商:Freescale Semiconductor 功能描述:
MC68HC908QT1CFQ 制造商:Rochester Electronics LLC 功能描述:NITRON DFN - Bulk
MC68HC908QT1CP 功能描述:IC MCU 1.5K FLASH 8-DIP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:HC08 其它有關(guān)文件:STM32F101T8 View All Specifications 特色產(chǎn)品:STM32 32-bit Cortex MCUs 標(biāo)準(zhǔn)包裝:490 系列:STM32 F1 核心處理器:ARM? Cortex?-M3 芯體尺寸:32-位 速度:36MHz 連通性:I²C,IrDA,LIN,SPI,UART/USART 外圍設(shè)備:DMA,PDR,POR,PVD,PWM,溫度傳感器,WDT 輸入/輸出數(shù):26 程序存儲(chǔ)器容量:64KB(64K x 8) 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):2 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 10x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:36-VFQFN,36-VFQFPN 包裝:托盤 配用:497-10030-ND - STARTER KIT FOR STM32497-8853-ND - BOARD DEMO STM32 UNIV USB-UUSCIKSDKSTM32-PL-ND - KIT IAR KICKSTART STM32 CORTEXM3497-8512-ND - KIT STARTER FOR STM32F10XE MCU497-8505-ND - KIT STARTER FOR STM32F10XE MCU497-8304-ND - KIT STM32 MOTOR DRIVER BLDC497-6438-ND - BOARD EVALUTION FOR STM32 512K497-6289-ND - KIT PERFORMANCE STICK FOR STM32MCBSTM32UME-ND - BOARD EVAL MCBSTM32 + ULINK-MEMCBSTM32U-ND - BOARD EVAL MCBSTM32 + ULINK2更多... 其它名稱:497-9032STM32F101T8U6-ND
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