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5.9 Serial Data Interfaces
LZT 123 7589 R1A
5. SYSTEM CONNECTOR INTERFACE
Typical Rise/Fall times
PCMCLK
PCMSYN
PCMOUT
PCMDLD
Pin
Signal
Dir
41
TD
I
42
RD
O
39
RTS
I
IO9
I/O
40
CTS
O
KeyCOL4
O
O4
O
37
DTR
I
KeyROW1
I
IN1
32
DSR
O
KeyCOL3
O
O3
O
38
DCD
O
KeyCOL 1
O
O1
O
36
RI
O
KeyCOL 2
O
O2
O
45
TD2
I
46
RD2
O
43
TD3
I
44
RD3
O
The serial channels, consisting of three UARTs, are asynchronous
communication links to the application or accessory units.
• UART1 has RS-232 functionality and is used for all on- and off -line
communication.
• UART2 behaves as a general-purpose serial data link. For example, it
can be used for GPS, downloading software and receiving logging
information.
• UART3 behaves as a general-purpose serial data link. It can be used by
an embedded application.
Rise Time
19
19
900
20
Description
Serial data to radio device (UART1)
Serial data from radio device (UART1)
Request To Send (UART1)
General purpose input/output 9
Clear To Send (UART1)
Key column 4
General purpose output 4
Data Terminal Ready (UART1)
Keyboard row 1
General purpose input 1
Data Set Ready (UART)
Key column 3
General purpose output 3
Data Carrier Detect (UART1)
Key column 1
General purpose output 1
Ring Indicator (UART1)
Key Column 2
General output 2
Transmitted Data (UART2)
Received Data (UART2)
Transmitted Data (UART3)
Received Data (UART3)
Fall Time
Unit
18
ns
15
ns
900
ns
19
ns
RS232
CCITT Nº
103
104
105
106
108.2
107
109
125
36
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