Datasheet

18-8 MCF5307 User’s Manual
Data Transfer Operation
Figure 18-6. Basic Read Bus Cycle
Note the following characteristics of a basic read:
• In S3, data is made available by the external device on the falling edge of BCLKO
and is sampled on the rising edge of BCLKO with T
A asserted.
• In S4, the external device can stop driving data after the rising edge of BCLKO.
However, data could be driven up to S5.
• For a read cycle, the external device stops driving data between S4 and S5.
States are described in Table 18-4.
18.4.4 Write Cycle
During a write cycle, the MCF5307 sends data to memory or to a peripheral device. The
write cycle flowchart is shown in Figure 18-7.
R/W
TT[1:0], TM[2:0]
TIP
TS
D[31:0]
TA
Read
S0 S1 S2 S3 S4 S5
BCLKO
AS
, CSx
BEx, OE
S
IZ[1:0], A[31:0]
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Freescale Semiconductor, Inc.
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