UPD4990AG Renesas Electronics America, UPD4990AG Datasheet - Page 12

• Manufacturer Part Number: UPD4990AG
• Manufacturer: Renesas Electronics America

Specifications of UPD4990AG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

10
REGISTER HOLD
REGISTER SHIFT
TIME SET
TIME READ
8 192 Hz
8 192 Hz
Test mode
In the test mode, data is output to the DATA OUT pin regardless of whether data has been input to OUT
ENBL.
There are two different test modes depending on the OUT ENBL data.
(1) Test mode 1 (OUT ENBL = 0)
(2) Test mode 2 (OUT ENBL = 1)
MODE
8 192 Hz signals are set parallel in the counters for year, month, week, day, time, minute, and second.
There is no carry from these counters.
A 8 192 Hz signal is input to the second counter instead of the 1 Hz signal. There is carry from counters.
Outputs from DATA OUT and TP OUT pins in different function modes are listed below.
When the REGISTER HOLD command cancels the test mode, 64 Hz is output to the TP pin.
Year
counter
Year
counter
Month
counter
Month
counter
LSB of shift register
LSB of shift register
DATA OUT
1 Hz
1 Hz
Week
counter
Week
counter
L Level
64 Hz
32 Hz
32 Hz
TP
Day
counter
Day
counter
By this command, TEST MODE is released.
Test mode
Time
counter
Time
counter
8 192 Hz input to time counter
8 192 Hz input to time counter
Others
Minute
counter
Minute
counter
Second
counter
Second
counter
PD4990A