Usb; Removable-User Identity Module (R-Uim) Interface; Figure 12. Uart2 Interface - Motorola c18 Developer's Manual

Hardware Description
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
Note
3.6.4

USB

The c18 module operates as a full-speed USB device. The interface connector contains USB interface signals, for example,
VBUS, D+ and D-. The module contains an integrated USB transceiver, thus eliminating the need for an external one.
Integrators should only add an external "B" series receptacle to ensure proper connectivity.
After module power-up, the user should wait for six to seven seconds before attempting to establish USB communication, since
the module is unable to communicate at that time.
The following operating systems are supported for USB communication: Windows 2000.
3.6.5

Removable-User Identity Module (R-UIM) Interface

The c18 has optional internal and external R-UIM interfaces. Two R-UIM signals (UIM DATA and UIM CLK) are shared with
UART2 signals (RXD and CTS). For this reason, only one of these interfaces can be used at a time. The interface supports
3V cards.
R-UIM is hardware supported.
Note
26
TXD
RXD
RTS
HOST
UART
(DTE)
CTS

Figure 12. UART2 Interface

TXD
100kΩ
RXD
RTS
c18
UART(2)
100kΩ
(DCE)
CTS
Ω
resistor.
98-08901C63-A