bu9768ak ROHM Co. Ltd., bu9768ak Datasheet - Page 15

• Manufacturer Part Number: bu9768ak
• Description: Driver Segmented Module With Input Function
• Manufacturer: ROHM Co. Ltd.

The flow of operations taking place during a key scan is shown below.
The “successful” judgment of the key scan shown in the illustration is based on the data from the two key scans
matching for all of the keys, as described on page 13.
If an error occurs, the key scan is carried out once again after the first key scan has been completed if a key has
remained pressed, and continues to be carried out as long as the key is pressed, until it is successfully completed.
After a key scan has been successfully completed, no new key scans can be carried out until reading of the key data
has been completed.
3) Operation flow in a key scan
Standard ICs
Waiting for input of key data read code
Fig. 12 Key scan flow
Key input (key scan starts)
Was key scan successful?
Waiting for key input
Has key been input?
DO
LOW
Yes
Yes
No
No
BU9768AK / BU9768AKV
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