- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄379858 > CDP1879CD1 (INTERSIL CORP) CMOS Real-Time Clock PDF資料下載
參數(shù)資料
| 型號(hào)： | CDP1879CD1 |
| 廠商： | INTERSIL CORP |
| 元件分類(lèi)： | XO, clock |
| 英文描述： | CMOS Real-Time Clock |
| 中文描述： | REAL TIME CLOCK, CDIP24 |
| 封裝： | HERMETIC SEALED, SIDE BRAZED, CERAMIC, DIP-24 |
| 文件頁(yè)數(shù)： | 6/18頁(yè) |
| 文件大?。?/td> | 100K |
| 代理商： | CDP1879CD1 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)當(dāng)前第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)
4-109
General Operation
The real-time clock contains seconds, minutes, and hours,
date and month counters that hold time of day/calendar
information (see Figure 2). The frequency of an intrinsic
oscillator is divided down to supply a once-a-second signal
to the counter series string. The counters are separately
addressable and can be written to or read from.
The real-time clock contains seconds, minutes and hour
write-only alarm latches that store the alarm time (see Fig-
ure 3). When the value of the alarm latches and counters are
equal, the interrupt output is activated. The interrupt output
can also be activated by a clock output transition. The clock
output is derived from the prescaler and counters and can
be one of 15 square-wave signals. The value in the read-
only interrupt status register identifies the interrupt source.
Operational control of the real-time clock is determined by
the byte in a write-only control register. The 8-bit value in this
register determines the correct divisor for the prescaler, a
data direction and alarm enable bit, clock output select, and
start/stop control (see Figure 4).
Data transfer and addressing are accomplished in two
modes of operation, memory mapping and I/O mapping
using the CDP1800-series microprocessors. The mode is
selected by the level on an input pin. (IO/MEM). Memory
mapping implies use of the address lines as chip selects and
address inputs during linear selection or partial or full decod-
ing methods. I/O mapping with the CDP1800-series micro-
processors involves use of the N line outputs in conjunction
with input and output instructions to transfer data to and from
memory.
REGISTER TRUTH TABLE
ADDRESS
ACTIVE SIGNAL
BIT 3 CONTROL
REGISTER
REGISTER OPERATION
A2
A1
AO
TPB/WR
RD
0
1
0
X
-
0
Write Seconds Counter
0
1
0
-
X
0
Read Seconds Counter
0
1
1
X
-
0
Write Minutes Counter
0
1
1
-
X
0
Read Minutes Counter
1
0
0
X
-
0
Write Hours Counter
1
0
0
-
X
0
Read Hours Counter
1
0
1
X
-
0
Write Date Counter
1
0
1
-
X
0
Read Date Counter
1
1
0
X
-
0
Write Month Counter
1
1
0
-
X
0
Read Month Counter
0
1
0
X
-
1
Write Seconds Alarm Latch
0
1
1
X
-
1
Write Minutes Alarm Latch
1
0
0
X
-
1
Write Hours Alarm Latch
1
1
1
X
-
-
Write Control Register
1
1
1
-
X
-
Read Int. Status Register
CDP1879, CDP1879C-1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CDP1879CD1X | IC LOGIC 16211 24-BIT FET BUS SWITCH -40+85C SSOP-56 26/TUBE |
| CDP1879 | CMOS Real-Time Clock(CMOS 實(shí)時(shí)時(shí)鐘) |
| CDP1879E | CMOS Real-Time Clock |
| CDP1879CE1 | CMOS Real-Time Clock |
| CDP1881CE | CMOS 6-Bit Latch and Decoder Memory Interfaces |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CDP1879CD1X | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:CMOS Real-Time Clock |
| CDP1879CE1 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:CMOS Real-Time Clock |
| CDP1879D | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Peripheral IC |
| CDP1879E | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CDP1881C | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:CMOS 6-Bit Latch and Decoder Memory Interfaces |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。