MC68EC040RC40A Freescale Semiconductor, MC68EC040RC40A Datasheet - Page 173

• Manufacturer Part Number: MC68EC040RC40A
• Description: IC MPU 32BIT 40MHZ 179-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC040RC40A

• Processor Type: M680x0 32-Bit
• Speed: 40MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 179-PGA
• Lead Free Status / RoHS Status: Contains lead / RoHS Compliant
• Features: -

The M68040 takes an interrupt exception for a pending interrupt within one instruction
boundary after processing any other pending exception with a higher priority. Thus, the
M68040 executes at least one instruction in an interrupt exception handler before
recognizing another interrupt request. The following paragraphs describe the various kinds
of interrupt acknowledge bus cycles that can be executed as part of interrupt exception
processing. Table 7-4 provides a summary of the possible interrupt acknowledge
terminations and the exception processing results.
7.5.1.1 INTERRUPT ACKNOWLEDGE BUS CYCLE (TERMINATED NORMALLY).
When the M68040 processes an interrupt exception, it performs an interrupt acknowledge
bus cycle to obtain the vector number that contains the starting location of the interrupt
exception handler. Some interrupting devices have programmable vector registers that
contain the interrupt vectors for the exception handlers they use. Other interrupting
conditions or devices cannot supply a vector number and use the autovector bus cycle
described in 7.5.1.2 Autovector Interrupt Acknowledge Bus Cycle.
MOTOROLA
High
High
Low
Low
Low
TA
Table 7-4. Interrupt Acknowledge Termination Summary
High
High
High
TEA
Low
Low
Freescale Semiconductor, Inc.
For More Information On This Product,
Don’t Care Insert Waits
Don’t Care Take Spurious Interrupt Exception
Don’t Care Retry Interrupt Acknowledge Cycle
AVEC
High
Low
Go to: www.freescale.com
M68040 USER’S MANUAL
Latch Vector Number on D7–D0 and Take Interrupt
Take Autovectored Interrupt Exception
Exception
Termination Condition
7- 31