MC68340 datasheet(72/441 Pages) FREESCALE

tên linh kiện	MC68340

Giải thích chi tiết về linh kiện	Integrated Processor with DMA User?셲 Manual

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MOTOROLA

MC68340 USER’S MANUAL

3- 23

3.4.2 LPSTOP Broadcast Cycle

The low power stop (LPSTOP) broadcast cycle is generated by the CPU32 executing the

LPSTOP instruction. Since the external bus interface must get a copy of the interrupt

mask level from the CPU32, the CPU32 performs a CPU space type 3 write with the mask

level encoded on the data bus, as shown in the following figure. The CPU space type 3

cycle waits for the bus to be available, and is shown externally to indicate to external

devices that the MC68340 is going into LPSTOP mode. If an external device requires

additional time to prepare for entry into LPSTOP mode, entry can be delayed by asserting

HALT. The SIM40 provides internal DSACK

≈ response to this cycle. For more information

on how the SIM40 responds to LPSTOP mode, see Section 4 System Integration

Module.

9876543210

—————————————

I2–I0—Interrupt Mask Level

The interrupt mask level is encoded on bits 2–0 of the data bus during an LPSTOP

broadcast.

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