SECTION 4 SYSTEM INTEGRATION MODULE
This section is an overview of SIM function. Refer to the SIM Reference Manual (SIM-
RM/AD) for a comprehensive discussion of SIM capabilities. Refer to APPENDIX D
REGISTER SUMMARY for information concerning the SIM address map and register
structure.
4.1 General
The system integration module (SIM) consists of five functional blocks. Figure 4-1 is
a block diagram of the SIM.
The system configuration and protection block controls configuration parameters and
provides bus and software watchdog monitors. In addition, it provides a periodic inter-
rupt generator to support execution of time-critical control routines.
The system clock generates clock signals used by the SIM, other IMB modules, and
external devices.
4
The external bus interface handles the transfer of information between IMB modules
and external address space. EBI pins can also be configured for use as general-pur-
pose I/O ports E and F.
The chip-select block provides 12 chip-select signals. Each chip-select signal has an
associated base register and option register that contain the programmable character-
istics of that chip select. Chip-select pins can also be configured for use as general-
purpose output port C.
The system test block incorporates hardware necessary for testing the MCU. It is used
to perform factory tests, and its use in normal applications is not supported.
MC68331
SYSTEM INTEGRATION MODULE
MOTOROLA
4-1
USER’S MANUAL
MOTOROLA [ MOTOROLA ]
