參數(shù)資料
型號(hào)： DS1543-70
英文描述： 64k NV Timekeeping RAM
中文描述： 64K的非易失內(nèi)存時(shí)鐘
文件頁數(shù)： 5/17頁
文件大?。?/td> 199K
代理商： DS1543-70
DS1543
5 of 17
DS1543 REGISTER MAP
Table 2
DATA
B
4
ADDRESS
B
7
B
6
B
5
B
3
B
2
YEAR
MONTH
DATE
B
1
B
0
FUNCTION/RANGE
1FFFh
1FFEh
1FFDh
1FFCh
1FFBh
1FFAh
1FF9h
1FF8h
1FF7h
1FF6h
1FF5h
1FF4h
1FF3h
1FF2h
1FF1h
1FF0h
10 Year
YEAR
MONTH
DATE
DAY
HOUR
MINUTES
SECONDS
CONTROL
WATCHDOG
INTERRUPTS
ALARM DATE
ALARM HOURS
ALARM MINUTES
ALARM SECONDS
UNUSED
FLAGS
00-99
01-12
01-31
01-07
00-23
00-59
00-59
X
X
X
X
X
X
X
FT
X
X
10 M
10 Date
X
X
X
DAY
10 HOUR
HOUR
MINUTES
SECONDS
Y
BMB0
Y
DATE
HOURS
MINUTES
SECONDS
Y
0
10 MINUTES
10 SECONDS
Y
BMB4
BMB3
Y
Y
Y
10 MINUTES
10 SECONDS
Y
AF
OSC
W
WDS
AE
AM4
AM3
AM2
AM1
Y
WF
R
Y
Y
Y
Y
BMB2
Y
BMB1
Y
RB1
Y
RB0
Y
ABE
10 DATE
10 HOURS
01-31
00-23
00-59
00-59
Y
0
Y
Y
0
Y
0
Y
0
BLF
X = Unused, read/writable under Write and Read
bit control
FT = Frequency Test bit
OSC
= Oscillator start/stop bit
W = Write bit
R = Read bit
WDS = Watchdog Steering bit
BMB0-BMB4 = Watchdog Multiplier bits
RB0-RB1 = Watchdog Resolution bits
AE = Alarm Flag Enable
Y = Unused, read/writable without Write and
bit control
ABE = Alarm in battery Back-up mode enable
AM1-AM4 = Alarm Mask bits
WF = Watchdog Flag
AF = Alarm Flag
0 = “0” and are read only
BLF = Battery Low Flag
CLOCK OSCILLATOR CONTROL
The Clock oscillator may be stopped at any time. To increase the shelf life of the backup lithium battery
source, the oscillator can be turned off to minimize current drain from the battery. The
OSC
bit is the
MSB of the seconds register (B7 of 1FF9h). Setting it to a 1 stops the oscillator, setting to a 0 starts the
oscillator. The DS1543 is shipped from Dallas Semiconductor with the clock oscillator turned off,
OSC
bit set to a 1.
READING THE CLOCK
When reading the RTC data, it is recommended to halt updates to the external set of double-buffered RTC
registers. This puts the external registers into a static state allowing data to be read without register
values changing during the read process. Normal updates to the internal registers continue while in this
state. External updates are halted when a 1 is written into the read bit, B6 of the Control register (1FF8h).
As long as a 1 remains in the Control register read bit, updating is halted. After a halt is issued, the
registers reflect the RTC count (day, date, and time) that was current at the moment the halt command
was issued. Normal updates to the external set of registers will resume within 1 second after the read bit
is set to a 0.
相關(guān)PDF資料
PDF描述
DS1543W-100 64k NV Timekeeping RAM
DS1543W-70 64k NV Timekeeping RAM
DS1543P 64K NV Real Time Clocks RAM
DS1554-100 256K NV Y2KC Timekeeping RAM
DS1554-70 256K NV Y2KC Timekeeping RAM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1543-85 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1543-85+ 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1543P 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:64K NV Real Time Clocks RAM
DS1543P-100 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1543P-100+ 功能描述:實(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
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