Nokia RH-41 Series, Техническая документация инструкция

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RH-41
System Module CCS Technical Documentation
Page 16
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Nokia Corporation Confidential Issue 2 09/2003
Figure 3: Placement of keys
Power Key
All signals for the keyboard come from the UPP ASIC, except PWRONX line for the power
key signal which is connected directly to the UEM. The pressing of the PWR key grounds
the PWRONX line and the UEM generates an interrupt to UOO, which is then recognized
as a PWR key press.
Keys
Other keys are detected so that when a key is pressed down, the metal dome connects
one S-line and one R-line of the UPP together and creates an interrupt for the SW. This
kind of detection is also known as
metaldome detection . The matrix of how lines are con-
nected and which lines are used for different keys is described in the following table. The
S-line S0 and R-line R5 are not used at all.
where NC = Not Connected
Returns /
Scans
S0 S1 S2 S3 S4
R0 NC NC Send End NC
R1 NC Soft left Up Down Soft right
R2 NC 1 4 7 *
R3 NC 2 5 8 0
R4 NC 3 6 9 #
R5 NC NC NC NC NC
1 2 3
4
5 6
7
8
9
#
0
*
Up
Down
End Send
S Right S Left