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參數(shù)資料
| 型號： | AN1759 |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | Add a Non-Volatile Clock to the MC68HC705J1A |
| 中文描述： | 添加非易失時鐘的MC68HC705J1A |
| 文件頁數(shù)： | 4/24頁 |
| 文件大?。?/td> | 316K |
| 代理商： | AN1759 |
Application Note
AN1759
4
X1 and X2
These pins are used to connect a 32.768-kHz crystal to the device. No
other capacitors or resistors are needed for this crystal circuit. The
internal oscillator circuitry is designed for a crystal with load capacitance
of 12.5 pF. For the test circuit described in this application note, an
Epson C-001R crystal was used. The Digi-key part number for this
device is SE3201-ND.
SQW/OUT
When enabled, this pin outputs one of four selectable frequencies:
1 Hz
4.096 kHz
8.192 kHz
32.768 kHz
The1-HzsignalcanbeusedtofeedanexternalinterruptpinonanMCU.
This allows the MCU to use minimal bandwidth when servicing the
timekeeping function of a system.
When disabled, the pin acts as a normal output pin. It is controlled via
the DS1307 control register.
SC L
The SCL pin is the clock input for the DS1307 2-wire serial interface.
SDA
The SDA pin is an I/O pin used to transmit and receive data off the 2-wire
serialinterface.SDAisanopen-drainpinthatrequiresanexternalpullup
resistor.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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