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SIM Logic level shifting
The SIM interface supports 3V and 1.8V SIM cards.
User interface
Display
The display unit has a parallel interface, consisting of the following:
• 8-bit data bus (DISPDATA(7:0))
• Write enable WRX
• Read enable RDX
• Reset RESX
Keyboard
There are two keypads; one on the UI board and one on the PWB.
There are also some keys placed outside the keypads:
TikuPin
GPIO38
GPIO53
Display and keypad backlight
There are three sets of LEDs (Light emitting diodes) illuminating the display and the keypads:
Page 9 –14
Figure 128 Keyboards with Tiku connections
Key
Capture
Volume Up
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Tiku Pin
UEMEK PWRONX
GPIO54
RM-82
System module
Key
Power ON
Volume Down
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