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MBAR
($0003FF00
FC=0111)
NOTE: $XXXXX is the value contained in the MBAR bits BA31-BA12.
4.2.2 System Configuration and Protection Operation
The SIM40 allows the user to control certain features of system configuration by writing
bits in the module configuration register (MCR). This register also contains read-only
status bits that show the state of the SIM40.
All M68000 family members are designed to provide maximum system safeguards. As an
extension of the family, the MC68340 promotes the same basic concepts of safeguarded
design present in all M68000 members. In addition, many functions that normally must be
provided by external circuits are incorporated in this device. The following features are
provided in the system configuration and protection function:
SIM40 Module Configuration
The SIM40 allows the user to configure the system to the particular requirements. The
functions include control of FREEZE and show cycle operation, the function of the CS
signals, the access privilege of the supervisor/user registers, the level of interrupt
arbitration, and automatic vectoring for external interrupts.
Reset Status
The reset status register provides the user with information on the cause of the most
recent reset. The possible causes of reset include: external, power-up, software
watchdog, double bus fault, loss of clock, and RESET instruction.
MOTOROLA
Freescale Semiconductor, Inc.
$FFFFFFFF
$XXXXXFFF
MC68340
RELOCATABLE
MODULE
BLOCK
$XXXXX000
RAM
(TYPICAL)
$00000000
Figure 4-1. SIM40 Module Register Block
MC68340 USER'S MANUAL
For More Information On This Product,
Go to: www.freescale.com
$FFF
$7BF
DMA
$780
$721
SERIAL PORTS
$700
.
$67F
TIMER MODULES
$600
$07F
SIM 40
$000
4- 3
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