UPD4990AC データシートの表示（PDF） - NEC => Renesas Technology
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UPD4990AC Datasheet PDF : 20 Pages
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µPD4990A
COMMAND SPECIFICATIONS
° Commands input from C0, C1, and C2 pins (1 ...H, 0 ...L)
Shift register 40 bit (The year function is ineffective.)
(Operates as the existing µPD1990AC in other than test mode)
C2
C1
C0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
FUNCTION
Register Hold
DATA OUT = 1 Hz
Register Shift
DATA OUT = [LSB] = 0 or 1
Time Set & Counter Hold
DATA OUT = [LSB] = 0 or 1
Time Read
DATA OUT = 1 Hz
TP = 64 Hz
TP = 256 Hz
TP = 2 048 Hz
Serial command transfer mode
* The test mode is cancelled by [C2, C1, C0] = [0, 0, 0] to [1, 1, 0].
° Serial data commands
Set [C2, C1, C0] = [1, 1, 1] at all time.
Shift register 52 bit (The year function is effective.)
C3'
C2'
C1'
C0'
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
FUNCTION
Register Hold
DATA OUT = 1 Hz
Register Shift
DATA OUT = [LSB] = 0 or 1
Time Set & Counter Hold
DATA OUT = [LSB] = 0 or 1
Time Read
DATA OUT = 1 Hz
TP = 64 Hz
TP = 256 Hz
TP = 2 048 Hz
TP = 4 096 Hz
TP = 1 s interval set (counter reset & start)
TP = 10 s interval set (counter reset & start)
TP = 30 s interval set (counter reset & start)
TP = 60 s interval set (counter reset & start)
Interval Output Flag Reset
Interval Timer Clock Run
Interval Timer Clock Stop
TEST MODE SET
When serial data commands are used, C0, C1, and C2 pins should be connected VDD pin.
6
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