mcf51jf128 Freescale Semiconductor, Inc, mcf51jf128 Datasheet - Page 561
mcf51jf128
Manufacturer Part Number
mcf51jf128
Description
Mcf51jf128 Reference Manual
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF51JF128.pdf
(1339 pages)
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The following figure shows the write cycle timing diagram.
Freescale Semiconductor, Inc.
FB_CLK
FB_A[Y]
FB_D[X]
FB_RW
FB_TS
FB_ALE
FB_CSn
FB_OEn
FB_BE/BWEn
FB_TA
FB_TSIZ[1:0]
2. Place address on the external address signals.
1. Set FB_R/W to write.
3. Assert transfer start.
1. Negate transfer start.
3. Drive data.
1. Mini-FlexBus asserts internal transfer
1. Start next cycle.
2. Assert FB_CSn.
acknowledge (auto-acknowledge).
MCF51JF128 Reference Manual, Rev. 2, 03/2011
FlexBus
Figure 24-17. Basic Write-Bus Cycle
Figure 24-16. Write-Cycle Flowchart
Address
Address
TSIZ
Preliminary
AA=0
AA=1
Data
AA=0
AA=1
1. Select the appropriate slave device.
2. Latch data on FB_AD[31:X:0].
1. Decode address.
Chapter 24 External Bus Interface (Mini-FlexBus)
External Memory/Peripheral
561
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