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參數(shù)資料
| 型號： | UPD4990AG |
| 廠商： | NEC Corp. |
| 英文描述： | SERIAL I/O CALENDAR & CLOCK CMOS LSI |
| 中文描述： | 串行I / O日歷 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 129K |
| 代理商： | UPD4990AG |
μ
PD4990A
4
FUNCTION SPECIFICATIONS
Crystal frequency (X tal osc.).
°
32.768 kHz
Data
Data types are: second, minute, day, week, month, and year.
Leap years, 31-day months, and months with 30 or less days are adjusted automatically.
A 24-hour system is used and last two digits of Gregorian year are indicated.
It is assumed that leap years are expressed by multiples of 4.
Data format
Data is represented in BCD notation. Only months are represented in hexadecimal notation.
Data input-output and Clock
Data is input/output synchronously with reference to the external clocks input from the CLK pin using the serial
input/output system. (See Fig. 1.)
Timing pulse output
Three frequencies, 64 Hz, 256 Hz, and 2 048 Hz, can be set with C
0
, C
1
and C
2
pins.
Using serial data input command, selective timing pulses (TPs) are 64 Hz, 256 Hz, 2 048 Hz, and 4 096 Hz
and selective output intervals are 1, 10, 30, and 60 seconds.
Function mode selection
A function mode can be selected by the inputs from C
0
, C
1
, and C
2
. Also a function mode can be selected through
serial data input. (C
0
= C
1
= C
2
= V
DD
)
Each command is latched with STB (strobe).
Chip select
Connecting the CS pin to the ground level inhibits CLK and STB inputs.
Data output inhibition
Connecting the OUT ENBL pin to the ground level sets the DATA OUT pin at high impedance.
Figure 1.
command
register
Ten's of
year
C
3
'
Unit of
year
month
52 Bit Shift Register
* DATA of 52 Bit Shift Register appears on DATA OUT terminal from LSB of second.
day of
the week
Ten's of
days
Unit of
days
Ten's of
hours
Unit of
hours
Ten's of
minutes
Unit of
minutes
Ten's of
seconds
LSB
MSB
Unit of
seconds
C
2
' C
1
' C
0
'
D
3
D
2
D
1
D
0
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