參數(shù)資料
型號(hào)： AN1759
廠商： 飛思卡爾半導(dǎo)體(中國(guó))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(shí)鐘的MC68HC705J1A
文件頁(yè)數(shù)： 2/24頁(yè)
文件大?。?/td> 316K
代理商： AN1759
Application Note
AN1759
2
The non-volatile RAM (random-access memory) also gives the user
additional applications such as:
Power down information storage for consumer electronics like
TVs, VCRs, and hand-held portables
Identification number storage for remote addressing or security
Storage of telecommunication information like phone number
recall and speed dialing
This application note describes the interface between the
MC68HC705J1A(J1A)andtheDS1307.Circuitryandexamplecodeare
given to demonstrate the interface between the two parts.
Features
The DS1307 provides these features:
Real-time clock counts seconds, minutes, hours, day of the week,
date, month, and year.
Leap year compensation valid up to 2100
56 bytes of non-volatile RAM for data storage
2-wire serial interface
Programmable square wave output with frequencies of 1 Hz,
4.096 kHz, 8.192 kHz, and 32.768 kHz
Automatic power switching to battery when main power fails
In battery backup mode, less than 500 nA consumed at 25
°
C
8-pin DIP or SOIC package
Optional industrial temperature range of –40
°
C to +85
°
C
Description
The DS1307 is a low-power binary coded decimal (BCD) clock calendar
that provides seconds, minutes, hours, day, date, month, and year. In
addition, it has 56 bytes of non-volatile RAM. End-of-the-month
adjustments are automatic for months with less than 31 days. The
device also corrects for leap years. The clock can operate in either
12-hour or 24-hour mode. In 12-hour mode, an a.m./p.m indicator is
used.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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