NSB-9
System Module and User Interface
CCS Technical Documentation
Page 30
Nokia Corporation
Issue 1 04/03
Table 21: Power key function
When no key is pressed row inputs are high due to UPP internal pull-up resistors. The
columns are written zero. When key is pressed one row is pulled down and an interrupt is
generated to MCU. After receiving interrupt MCU starts scanning procedure. All columns
are first written high and then one column at the time is written down. All other col-
umns except one which was written down are set as inputs. Rows are read while column
at the time is written down. If some row is down it indicates that key which is at the
cross point of selected column and row was pressed. After detecting pressed key all reg-
ister inside the UPP are reset and columns are written back to zero.
Table 22: Engine keyboard matrix
Flip
Part of the NSB-9 keyboard is implemented in a separate flip module, which is double
sided. Top side consists of so called ITU-T keys (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, * and #). On the
other side (inner side) there is a half of so called qwerty keys.
There are 4 contacts (2 in parallel) from engine to flip: Supply voltage, grounding, clock
and data lines. VBAT is used as flip power supply. There is a 1.8V / 50mA regulator inside
the flip for uController power supply. Upper VBAT voltage for flip is disabled with load
switch when flip is closed. When the flip is open, the lower VBAT voltage for the flip is
disabled with another loadswitch (U320)
Flip keyboard
4x9 matrix is used in flip keyboard. The matrix is connected to flip MCU. Character and
shift keys are connected to own inputs to enable simultaneus key pressings. Matrix key
pressing is detected with scanning. Character and shift keypressings are detected by I/O
port interrupts. Flip MCU is connected to the engine with serial data and clock lines (UPP
GenI/O17 and 18).
Flip position
Power key
Note
Closed
Power key
Open
3rd SW key
Right SW key is working as power key.
P10
P11
P12
P13
P15
P15
P00
6
7
8
9
0
Backspace
P01
Y
U
I
O
P
=
P02
H
J
K
L
;
‘
P03
N
M
,
.
/
ENTER
P04
SW right
END
Arrow up
Arrow left
Arrow right
Arrow down
P05
SW left
SEND
Space
Vol up
Vol down
GenI/O 19
Shift
Содержание NSB-9
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