參數(shù)資料
型號(hào)： UPD4991A
廠商： NEC Corp.
英文描述： 4-BIT PARALLEL I/O CALENDAR CLOCK
中文描述： 4位并行I / O日歷鐘
文件頁(yè)數(shù)： 10/32頁(yè)
文件大?。?/td> 133K
代理商： UPD4991A
μ
PD4991A
10
FUNCTION SPECIFICATIONS
Reference frequency (X’tal OSC) ........... 32.768 kHz
Data format .............................................. BCD format
Data function
Year, month, day, date, hour, minute, and second counters
Leap year and months are automatically identified.
Leap year is identified every 4 years and can be set to any year.
Year is set in 2 digits.
Hour can be displayed in 12- or 24-hour mode.
Data input/output (D
3
, D
2
, D
1
, D
0
)
4-bit parallel input/output format
Data is written by WE signal and read by OE signal.
Function mode selection
With ADDRESS = “F
H
” (A
3
, A
2
, A
1
, A
0
= 1, 1, 1, 1), a mode is selected by DATA (D
3
, D
2
, D
1
, D
0
) input, and set
by input of WE signal.
A function is selected by ADDRESS input.
Timing pulse outputs (TP
1
, TP
2
)
TP
1
... Alarm coincidence signal.
One of the following is selectable:
2048 Hz
1024 Hz
64 Hz
16 Hz
1 Hz
1 pulse output (H
→
L)
TP
2
... Interval timer signal output.
One of the following is selectable:
60 s
30 s
10 s
1 s
0.1 s
Chip select (CS
1
, CS
2
)
When CS
1
= “H” or CS
2
= “L,” all inputs except X
IN
are disabled (non-select).
When CS
1
= “L” and CS
2
= “H,” all inputs are selected.
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