MC68020FE33E Freescale Semiconductor, MC68020FE33E Datasheet - Page 95
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MC68020FE33E
Manufacturer Part Number
MC68020FE33E
Description
IC MICROPROCESSOR 32BIT 132CQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68020EH16E.pdf
(306 pages)
Specifications of MC68020FE33E
Processor Type
M680x0 32-Bit
Speed
33MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
132-CQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
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Available stocks
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Company:
Part Number:
MC68020FE33E
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Part Number:
MC68020FE33E1E30G
Manufacturer:
MOT
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Freescale Semiconductor, Inc.
5.4.1.2 AUTOVECTOR INTERRUPT ACKNOWLEDGE CYCLE. When the interrupting
device cannot supply a vector number, it requests an automatically generated vector or
autovector. Instead of placing a vector number on the data bus and asserting
DSACK1/DSACK0, the device asserts AVEC to terminate the cycle. The DSACK1/DSACK0
signals may not be asserted during an interrupt acknowledge cycle terminated by AVEC.
The vector number supplied in an autovector operation is derived from the interrupt level
of the current interrupt. When AVEC is asserted instead of DSACK1/DSACK0 during an
interrupt acknowledge cycle, the MC68020/EC020 ignores the state of the data bus and
internally generates the vector number, the sum of the interrupt level plus 24 ($18). Seven
distinct autovectors, which correspond to the seven levels of interrupt available with IPL2–
IPL0, can be used. Figure 5-34 shows the timing for an autovector operation.
5.4.1.3 SPURIOUS INTERRUPT CYCLE. When a device does not respond to an interrupt
acknowledge cycle with AVEC or DSACK1/DSACK0, the external logic typically returns
BERR. In this case, the MC68020/EC020 automatically generates 24, the spurious
interrupt vector number. If HALT is also asserted, the processor retries the cycle.
5-48
M68020 USER’S MANUAL
MOTOROLA
For More Information On This Product,
Go to: www.freescale.com
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