
MC68F375
SINGLE-CHIP INTEGRATION MODULE 2 (SCIM2E)
MOTOROLA
REFERENCE MANUAL
Rev. 25 June 03
4-1
SECTION 4
SINGLE-CHIP INTEGRATION MODULE 2 (SCIM2E)
4.1 Overview
MC68F375 contains the single chip integration module 2 (SCIM2E). The SCIM2E con-
sists of several submodules:
The system configuration block controls MCU configuration and operating mode.
The system clock generates clock signals used by the SCIM2E, other IMB mod-
ules, and external devices. Circuitry is included to detect loss of the phase-locked
loop (PLL) reference frequency and to control clock operation in low power stop
mode.
The system protection block provides bus and software watchdog monitors. It
also incorporates a periodic interrupt generator that supports execution of time-
critical control routines.
The external bus interface (EBI) handles the transfer of information between the
CPU32 and external address space. Ports A, B, E, F, G, and H comprise the EBI
and may be used for discrete I/O subject to the MCU’s operating mode.
The chip-select block provides nine general-purpose chip-select signals and two
emulation support chip-select signals. Each general-purpose chip select has as-
sociated base address and option registers that control the programmable char-
acteristics of the chip select. Chip-select pins can also be used as general-
purpose output port C.
The MC68F375 SCIM2E includes improvements to the regular SCIM. This enhanced
SCIM includes improvements to the clock synthesizer. These changes are defined in
Manual (SCIMRM/AD) for more details on the characteristics of this module.
The SCIM2E has three basic operating modes:
16-bit expanded mode
8-bit expanded mode
Single-chip mode
Operating mode is determined by the logic states of specific MCU pins during reset.
on MCU operating modes.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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