MC68360CRC25L Freescale Semiconductor, MC68360CRC25L Datasheet - Page 113

• Manufacturer Part Number: MC68360CRC25L
• Description: IC MPU QUICC 25MHZ 241-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68360CRC25L

• Processor Type: M683xx 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 241-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

The interrupt acknowledge cycle is a read cycle. It differs from the read cycle described in
4.3.1 Read Cycle in that it accesses the CPU address space. Specifically, the differences
are as follows:
The responding device places the vector number on the data bus during the interrupt
acknowledge cycle. Beyond this, the cycle is terminated normally with DSACKx.
Figure 4-26 is a flowchart of the interrupt acknowledge cycle; Figure 4-27 shows the timing
for an interrupt acknowledge cycle terminated with DSACKx.
1. FC3–FC0 are set to $7 (FC3/FC2/FC1/FC0 = 0111) for CPU address space.
2. A3, A2, and A1 are set to the interrupt request level, and the IACKx strobe correspond-
3. The CPU32+ space type field (A19–A16) is set to $F (interrupt acknowledge).
4. Other address signals (A31–A20, A15–A4, and A0) are set to one.
ing to the current interrupt level is asserted. (Either the function codes and address sig-
nals or the IACKx strobes can be monitored to determine that an interrupt
acknowledge cycle is in progress and the current interrupt level.)
1) PLACE VECTOR NUMBER ON LEAST SIGNIFICANT
2) ASSERT DSACKx (OR AVEC IF NO VECTOR
1) NEGATE DSACKx
BYTE OF DATA PORT (DEPENDS ON
PORT SIZE)
NUMBER)
PROVIDE VECTOR NUMBER
INTERRUPTING DEVICE
REQUEST INTERRUPT
Figure 4-26. Interrupt Acknowledge Cycle Flowchart
RELEASE
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MC68360 USER’S MANUAL
Go to: www.freescale.com
1) SYNCHRONIZE IRQ7–IRQ1
2) COMPARE IRQ7–IRQ1 TO MASK LEVEL AND
3) ASSERT BCLRO
4) PLACE INTERRUPT LEVEL ON A1–A3;
5) SET R/W TO READ
6) SET FC3–FC0 TO 0111
7) DRIVE SIZx PINS TO INDICATE A ONE-BYTE
8) NEGATE BCLRO.
9) ASSERT AS, DS, AND OE
1) LATCH VECTOR NUMBER
2) NEGATE AS, DS, AND OE
WAIT FOR INSTRUCTION TO COMPLETE
TYPE FIELD (A19–A16) = $F
TRANSFER
ACQUIRE VECTOR NUMBER
START NEXT CYCLE
GRANT INTERRUPT
QUICC
Bus Operation