Specifications

Product Technical Specification & Customer Design Guidelines
Interfaces
3.6 Main Serial Link (UART1)
A flexible 8-wire serial interface is available, compliant with V24 protocol signaling,
but not with V28 (electrical interface) due to a 2.8 volts interface.
3.6.1 Features
The maximum baud rate of the UART1 is 921 Kbit/s.
The signals are as follows:
• TX data (DTM1)
• RX data (DFM1)
• Request To Send (RTS1)
• Clear To Send (CTS1)
• Data Terminal Ready (DTR1)
• Data Set Ready (DSR1)
• Data Carrier Detect (DCD1)
• Ring Indicator (RI).
3.6.2 Pin Description
Signal Pin
number
I/O I/O
type
Reset
state
Description Multiplexed
with
DTM1*
41
I 2V8-1 Z Transmit serial
data
GPIO18
DFM1*
42
O
2V8-1
1 Receive serial
data
GPIO17
See chapter 3.4, “Electrical Information for Digital I/O” on page 30 for 2V8-1, 2V8-2, pull-up and open drain
voltage characteristics and for Reset state definition.
RTS1*
39
I
2V8-1
Z Request To
Send
GPIO9
CTS1*
40
O
2V8-1
Z Clear To Send GPIO12
DSR1*
32
O
2V8-1
Z Data Set Ready GPIO7
DTR1*
37
I
2V8-1
Z Data Terminal
Ready
GPIO10
DCD1*
38
O
2V8-1
Undefined Data Carrier
Detect
GPIO11
RI*
36
O
2V8-1
Undefined Ring Indicator GPIO8
GND
2, 4, 6, 8,
10, 12
GND Ground
*According to PC view
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prior written agreement.
WA_DEV_Q64_PTS_001-003 January 9, 2009