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Siemens Information and Communication Products
Parameter
Comment
t
Write high byte to display enable high
10
t
Display enable high width
11
t
Display enable low width
12
t
Display register select setup
13
t
Display register select hold
14
t
Display chipselect setup
15
t
Display chipselect hold
16
t
Data setup
17
t
Data hold
18
t
Display enable high width read extension
11a
t
Display enable low to write high
19
t
Display register select to display enable high
20
t
Display chipselect to display enable high
21
t
Display enable high to data valid
22
t
Data hold
23
Table 4-3
Timing values of display interface
4.3.4
Keypad
10 Pins for 4*6 keypad matrix.
Signal
Function
KPR0...5
Keypad row
KPC0...3
Keypad column
For activation of a key, connect a row signal to the appropriate column signal. The keypad address matrix implemented
in the MMI software can be found in Chapter
Note: maximum input speed: 1 key per 400ms
4.3.5
Serial Interface RS323 (V.24) Connections and signals
The Serial Interface can be used for:
• AT command interface
• Software download (SW update), see
• serial interface for data/fax/SMS services.
:
Note
External level converter is necessary for V.24 level when using the M20.
The M20T has a direct 9 pin serial interface port.
Version 8 dated 15.03.00
I/O
Level
I
2.8 V
O
2.8 V
6.2 "Keypad address matrix" on page 142
8.5 "SW download (Version update)" on page 191
Hardware interfaces
Min.
Typ.
Max.
152
462
462
10
5
10
5
68
15
538
10
200
200
450
0
Comments
may be disconnected if unused
may be disconnected if unused
.
A
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
20
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