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參數(shù)資料
| 型號： | NS32FX211V |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | Microprocessor Compatible Real Time C |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PQCC20 |
| 封裝： | PLASTIC, LCC-20 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 171K |
| 代理商： | NS32FX211V |
Functional Description
(Continued)
*
RCH only used for
recharageable batteries
TL/F/11011–5
FIGURE 3. Typical System Connection Diagram
logic 1. The units and tens of seconds are set up by the
processor, giving time setting to the nearest second. All
three registers can be read by the processor for time output.
Minutes Counters
There are two minutes counters:
a. units of minutes
b. tens of minutes
Both registers may be read to or written from as required.
Hours Counters
There are two hours counters:
a. units of hours
b. tens of hours
Both counters may be accessed for read or write operations
as desired.
In 12-hour mode, the tens of hours register has only one
active bit and the top three bits are set to logic 0. Data bit 1
of the clock setting register is the AM/PM indicator; logic 0
indicating AM, logic 1 for PM.
When 24-hour mode is programmed, the tens of hours reg-
ister reads out two bits of data and the two most significant
bits are set to logic 0. There is no AM/PM indication and bit
1 of the clock setting register will read out a logic 0.
In both 12/24-hour modes, the units of hours will read out
four active data bits. 12 or 24-hour mode is selected by bit 0
of the clock setting register, logic 0 for 12-hour mode, logic
1 for the 24-hour mode.
Days Counters
There are two days counters:
a. units of day
b. tens of days
The days counters will count up to 28, 29, 30 or 31 depend-
ing on the state of the months counters and the leap year
counter. The microprocessor has full read/write access to
these registers.
Months Counters
There are two months counters:
a. units of months
b. tens of months
Both these counters have full read/write access.
Years Counters
There are two years counters:
a. units of years
b. tens of years
Both these counters have full read/write access. The years
will count up to 99 and roll over to 00.
5
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