mc68331cpv20b1 Freescale Semiconductor, Inc, mc68331cpv20b1 Datasheet - Page 45

• Manufacturer Part Number: mc68331cpv20b1
• Description: Mc68331 32 Bit Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

4.2.1 Module Mapping
4.2.2 Interrupt Arbitration
MC68331
USER’S MANUAL
Control registers for all the modules in the microcontroller are mapped into a 4-Kbyte
block. The state of the module mapping bit (MM) in the SIM module configuration reg-
ister (SIMCR) determines where the control register block is located in the system
memory map. When MM = 0, register addresses range from $7FF000 to $7FFFFF;
when MM = 1, register addresses range from $FFF000 to $FFFFFF.
Each module that can generate interrupt requests has an interrupt arbitration (IARB)
field. Arbitration between interrupt requests of the same priority is performed by serial
contention between IARB field bit values. Contention must take place whenever an in-
terrupt request is acknowledged, even when there is only a single request pending.
For an interrupt to be serviced, the appropriate IARB field must have a non-zero value.
If an interrupt request from a module with an IARB field value of %0000 is recognized,
the CPU32 processes a spurious interrupt exception.
CLOCK
Figure 4-2 System Configuration and Protection
PRESCALER
Freescale Semiconductor, Inc.
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For More Information On This Product,
SPURIOUS INTERRUPT MONITOR
SYSTEM INTEGRATION MODULE
MODULE CONFIGURATION
Go to: www.freescale.com
RESET STATUS
HALT MONITOR
BUS MONITOR
AND TEST
SOFTWARE WATCHDOG TIMER
PERIODIC INTERRUPT TIMER
RESET REQUEST
BERR
RESET REQUEST
IRQ [7:1]
SYS PROTECT BLOCK
4-3
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