參數(shù)資料
型號(hào)： DS87C530-QCL
英文描述： EPROM MICRO WITH REAL TIME CLOCK
中文描述： 微型存儲(chǔ)器與實(shí)時(shí)時(shí)鐘
文件頁(yè)數(shù)： 8/40頁(yè)
文件大小： 435K
代理商： DS87C530-QCL
128
256
60
60
24
SUB8–BITS
S6–BITS
6–BITS
5–BITS
DA3–BITS
1DAYS
SREGISTER
SECONDS
MINUTES
RHOURS
CALENDAR
MATCH COMPARATOR
RTCIF
RREGISTER
SALARM REG.
ASECONDS
AMINUTES
ALHOURS
RTCX2
RTCX1
DS87C530
022197 8/40
NONVOLATILE FUNCTIONS
The DS87C530 provides two functions that are perma-
nently powered if a user supplies an external energy
source. These are an on–chip real time clock and a non-
volatile SRAM. The chip contains all related functions
and controls. The user must supply a backup source
and a 32.768 KHz timekeeping crystal.
REAL TIME CLOCK
The on–chip Real Time Clock (RTC) keeps time of day
and calendar functions. Its timebase is a 32.768 KHz
crystal between pins RTCX1 and RTCX2. The RTC
maintains time to 1/256 of a second. It also allows a user
to read (and write) seconds, minutes, hours, day of the
week, and date. The clock organization is shown in Fig-
ure 2.
Timekeeping registers allow easy access to commonly
needed time values. For example, software can simply
check the elapsed number of minutes by reading one
register. Alternately, it can read the complete time of
day, including subseconds, in only four registers. The
calendar stores its data in binary form. While this
requires software translation, it allows complete flexibil-
ity as to the exact value. A user can start the calendar
with a variety of selections since it is simply a 16–bit
binary number of days. This number allows a total range
of 179 years beginning from 0000.
The RTC features a programmable alarm condition. A
user selects the alarm time. When the RTC reaches the
selected value, it sets a flag. This will cause an interrupt
if enabled, even in Stop mode. The alarm consists of a
comparator that matches the user value against the
RTC actual value. A user can select a match for one or
more of the sub–seconds, seconds, minutes, or hours.
This allows an interrupt automatically to occur once per
second, once per minute, once per hour, or once per
day. Enabling interrupts with no match will generate an
interrupt 256 times per second.
Software enables the timekeeper oscillator using the
RTC Enable bit in the RTC Control register (F9h). This
starts the clock. It can disable the oscillator to preserve
the life of the backup energy–source if unneeded. Val-
ues in the RTC Control register are maintained by the
backup source through power failure. Once enabled,
the RTC maintains time for the life of the backup source
even when V
CC
is removed.
The RTC will maintain an accuracy of
±
2 minutes per
month at 25
°
C. Under no circumstances are negative
voltages, of any amplitude, allowed on any pin while the
device is in data retention mode (V
CC
< V
BAT
). Negative
voltages will shorten battery life, possibly corrupting the
contents of internal SRAM and the RTC.
REAL TIME CLOCK
Figure 2
相關(guān)PDF資料
PDF描述
DS87C530 EPROM MICRO WITH REAL TIME CLOCK
DS87C530-ENL EPROM MICRO WITH REAL TIME CLOCK
DS87C530-KCL EPROM MICRO WITH REAL TIME CLOCK
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DS87C550 EPROM High-Speed Micro with A/D and PWM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS87C530-QCL+ 功能描述:8位微控制器 -MCU EPROM MCU w/RTC 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
DS87C530-QEL 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
DS87C530-QNL 功能描述:8位微控制器 -MCU EPROM MCU w/RTC 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
DS87C530-QNL+ 功能描述:8位微控制器 -MCU EPROM MCU w/RTC 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
DS87C530Z+ECL 制造商:Maxim Integrated Products 功能描述:MICRO OTP RTC 33MHZ 52P TQFP PB-FRR - Trays
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