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SECTION 17
PCMCIA INTERFACE
The PCMCIA host adapter module provides all control logic for a PCMCIA interface. Only
the analog power switching logic and buffering needs to be provided externally. The
PCMCIA host supports one PCMCIA socket.
17.1 FEATURES
The following list summarizes the main features of the PCMCIA interface:
• A Host Adapter Interface Fully Compliant with the PCMCIA Standard, Release 2.1+
(PC Card -16).
• Supports One PCMCIA Socket, Requiring only External Buffering and Analog
Switching Logic. The Socket is Referred to as Slot B to Maintain Compatibility with the
MPC821 Microprocessor.
• Supports Eight Memory or I/O Windows.
• Provides Eight General-Purpose I/O Pins when the PCMCIA Controller is not
Operating.
• Provides Two General-Purpose Output-Only Pins when the PCMCIA Controller is not
Operating.
17.2 SYSTEM CONFIGURATION
The PCMCIA host adapter interface module can control one PCMCIA socket, which is
illustrated in Figure 17-1. In this system configuration, you must accomplish electrical
isolation between the sockets and system bus using external buffers and bus transceivers.
These buffers also provide the voltage conversion needed from the MPC823e's 3.3V to 5V
cards. They must be powered by the card V
accept 5V inputs while generating 3.3V outputs, no conversion is needed for inputs.
MOTOROLA
. Since the MPC823e is 5V friendly and will
cc
MPC823e REFERENCE MANUAL
17-1
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