Hardware Description
24
98-08901C63-A
3.6.2
UART1
The c18 UART interface supports data-rates of up to 230 Kbps.
The default data-rate is 19.2 Kbps
. Figure 11 shows the
UART1 interface.
Figure 11. UART1 Interface
UART signals are low CMOS-level signals (0 to 2.8 V) that can be connected directly to the host UART. c18 input signals (such
as TXD, RTS and DTR signals) are buffered, making them capable of receiving signal levels up to 5.0 V. Signals are referenced
to the GND.
Table 9 lists the UART1 interface signal definitions.
Note
All unused UART input signals, or input signals that can become disconnected (such as those for cable removal),
should be pulled down. The suggested pull-down resistor is a 100k
Ω
resistor.
Table 9. UART1 Signal Definitions
Line Name
Line Function
Definition
UART1_TXD
Transmitted data
Data line from DTE (PC) to c18 (DCE).
UART1_RXD
Received data
Data line from c18 (DCE) to DTE (PC).
UART1_RTS
Request to send
By setting this line to logical 1, the DTE asks the
c18 (DCE) if it is ready to receive data.
UART1_CTS
Clear to send
When it is ready to receive data, the c18 sets this
line to logical 1 following the RTS.
HOST
UART
(DTE)
C18
UART(1)
(DCE)
TXD
TXD
RXD
RXD
CTS
CTS
DCD
DCD
DSR
DSR
RI
RI
100k
Ω
RTS
RTS
100k
Ω
DTR
DTR
100k
Ω
Содержание c18
Страница 1: ...Developer s Guide Motorola c18 Cellular Engine Module Description 98 08901C63 A ...
Страница 8: ...viii 98 08901C63 A ...
Страница 20: ...Introduction 12 98 08901C63 A ...
Страница 46: ...Hardware Description 38 98 08901C63 A ...
Страница 56: ...Mechanical Description 48 98 08901C63 A Figure 22 c18a1 Bottom View Figure 23 c18a1 Side View ...
Страница 57: ...98 08901C63 A 49 Mechanical Description Figure 24 c18c Top View Figure 25 c18c Bottom View ...
Страница 60: ...Service Support 52 98 08901C63 A ...
Страница 62: ...Suggested Connectors 54 98 08901C63 A ...
Страница 78: ...Hardware Requirements for CDG2 and Field Testing 70 98 08901C63 A ...
Страница 82: ...Index 74 98 08901C63 O ...