APPENDIX D REGISTER SUMMARY
This appendix contains address maps, register diagrams, and bit/field definitions for
the MCU. More detailed information about register function is provided in the appro-
priate sections of the manual.
Except for central processing unit resources, information is presented in the intermod-
ule bus address order shown in Table D-1.
Table D-1 Module Address Map
Module
GPT
Size (Bytes)
Base Address
$YFF900
64
SIM
128
512
$YFFA00
QSM
$YFFC00
Control registers for all the modules in the microcontroller are mapped into a 4-Kbyte
block. The state of the module mapping (MM) bit in the SIM configuration register
(SIMCR) determines where the control registers block is located in the system mem-
ory map. When MM = 0, register addresses range from $7FF000 to $7FFFFF; when
MM = 1, register addresses range from $FFF000 to $FFFFFF.
D
In the module memory maps in this appendix, the “Access” column specifies which
registers are accessible at the supervisor privilege level only and which registers can
be assigned to either the supervisor or user privilege level.
D.1 Central Processing Unit
CPU32 registers are not part of the module address map. The following diagram is a
functional representation of CPU resources.
MC68331
REGISTER SUMMARY
MOTOROLA
D-1
USER’S MANUAL
MOTOROLA [ MOTOROLA ]
