mc68ec040v Freescale Semiconductor, Inc, mc68ec040v Datasheet - Page 172

• Manufacturer Part Number: mc68ec040v
• Description: M68040 User Manual
• Manufacturer: Freescale Semiconductor, Inc

The M68040 asserts IPEND when an interrupt request is pending. Figure 7-20 illustrates
the assertion of IPEND relative to the assertion of an interrupt level on the IPL≈ signals.
IPEND signals external devices that an interrupt exception will be taken at an upcoming
instruction boundary (following any higher priority exception). The IPEND signal negates
after the processor recognizes the internal interrupt acknowledge and can precede the
external interrupt acknowledge bus cycle.
7- 30
COMPARE REQUEST WITH MASK IN SR
IPLs RECOGNIZED
IPL2–IPL0
OTHERWISE
Figure 7-19. Interrupt Pending Procedure
IPLs SYNCHRONIZED
IPEND
BCLK
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Figure 7-20. Assertion of
M68040 USER’S MANUAL
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SAMPLE AND SYNCHRONIZE
ASSERT IPEND
IPL2–IPL0
RESET
INTERRUPT LEVEL I2–I0,
OR TRANSITION ON LEVEL 7
IPEND
ASSERT IPEND
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