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CY4672 Reference Design Guide, Document # 001-16968 Revision ** 69
Keyboard
Example
The following reports are sent if a user presses the Suspend/Sleep (Power Key 0) key on the key-
board.
The Suspend/Sleep down key packet sent from the keyboard to the bridge is shown in Table 4-14.
The up key packet sent from the keyboard to the bridge is shown in Example Up Key Power Keys
Report.
4.3.9.1.4 Keep Alive Report
An Application Report Header of 0xFC indicates that this report is a Keep Alive report.
Example of a Keep Alive reports sent from the keyboard to the bridge is shown in Table 4-16.
If the bridge does not receive a Keep Alive packet or an up key within a specified interval
(DOWNKEY_TIME_OUT) while a down key is present, the bridge generates an up key to the com-
puter.
4.3.9.1.5 Battery Voltage Level Report
An Application Report Header of 0xFD indicates that this report is a Battery Voltage Level report.
The Battery Voltage Level report format is shown in Table 4-17.
The Battery Voltage Level ranges from 1 (low) to 10 (full).
The Battery Voltage Level report is sent after a keystroke that occurs whenever the keyboard has
been in idle for more than 8 seconds.
Table 4-14. Example Suspend/Sleep Down Key Power Keys Report
Application Report
Application Report
Header
Power Key Scan
0xFE 0x02
Table 4-15. Example Up Key Power Keys Report
Application Report
Application Report Header
0xFE
Table 4-16. Example Keep Alive Report (Null Packet Support disabled)
Application Report
Application Report Header
0xFC
Table 4-17. Battery Voltage Level Report Format
Byte Name
2
Application Report Header
0xFD
3 Battery Voltage Level
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