Interfacing and controlling the RIM 801D: Controlling the RIM 801D
Integrator’s Guide – RIM 801D OEM Radio Modem
44
Controlling the RIM 801D
There are different approaches to integrating the radio modem, and these
depend on the design of the embedded system. We have provided an
example of a RIM 801D OEM integration using an 8051 micro-controller in
Figure 13.
The 8051 is configured with:
•
32 K of ROM
•
256 bytes of RAM
•
4 lines to the RIM 801D
•
28 general-purpose control lines that can be used for your control
functions.
Port 0 is “Open Drain” and all other ports are internally pulled up. Because
of the small volume of data, handshaking and flow control is not required.
Serial port interface
A standard 8250 UART interface is provided for your reference. This
interface may be used between the RIM 801D and a microprocessor data
bus. The schematic for this interface is found in Figure 14.
