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MPC823 Mobile Computing Microprocessor
MOTOROLA
PCMCIA-ATA Controller
The PCMCIA-ATA interface is a master controller that is compliant with Version 2.1 of the
PCMCIA standard. The interface supports one independent PCMCIA socket with the required
external transceivers or buffers. It provides eight memory or I/O windows that can be allocated to
the socket. If the PCMCIA port is not being used as a card interface, it can provide eight
general-purpose pins and two output-only pins with interrupt capability.
Power Management
The MPC823 microprocessor supports a wide range of power management features, including
normal high, normal low, doze, sleep, deep-sleep, and power-down modes. In normal high mode,
the MPC823 is fully powered with all internal units operating at the full speed of the processor.
Normal low mode is the same as normal high, except it operates at a much lower frequency. There
is a doze mode determined by a clock divider that allows the operating system to reduce the
operational frequency of the processor.
Doze mode disables core functional units except the timebase, decrementer, PLL, memory
controller, real-time clock, LCD controller, and communication processor module. Sleep mode is
a lower power mode that disables everything except the real-time clock, timebase, decrementer,
and periodic interrupt timer, thus leaving the PLL active for quick wake-up. The deep-sleep mode
then disables the PLL for lower power, but slower wake-up. Power-down mode disables all logic
in the processor, except the minimum logic required to restart the device. It saves the most power,
but requires the longest wake-up time.
System Debug Support
The MPC823 microprocessor contains an advanced debug interface that provides superior debug
capabilities without any loss of speed. It supports six watchpoint pins that can be combined with
eight internal comparators, four of which operate on the effective address of the address bus. The
other four comparators are split—two comparators operate on the effective address on the data bus
and two comparators operate on the data on the data bus. The MPC823 microprocessor can
compare using the =,
π
, <, and > conditions to generate watchpoints. Each watchpoint can then
generate a breakpoint that can be programmed to trigger in a programmable number of events.
Applications
The MPC823 microprocessor is specifically designed to be a general-purpose, low-cost entry point
to the Motorola embedded PowerPC Family for systems in which advanced GUIs,
communications, and high-level real-time operating systems are used. The device excels in
applications that require the performance of a single-issue PowerPC core with an ample amount of
data and instruction cache. It provides all the basic features of glueless memory connections along
with highly functional serial connectivity, a graphical LCD, and a video display controller. The
MPC823 excels in low-power and portable applications because of its extensive power-down
modes and low normal operation current.
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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