mcf5307cft90b Freescale Semiconductor, Inc, mcf5307cft90b Datasheet - Page 467

• Manufacturer Part Number: mcf5307cft90b
• Description: Mcf5307 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

1
0x3CC
0x3CC
MBAR
Offset
0x3C0
0x3C4
0x3C8
0x3D0
0x3D4
On the 0H55J and 1H55J revisions of the MCF5307, the byte count register of the DMA channels can
accommodate only 16 bits. However, on the newest revision of the MCF5307, an expanded 24-bit byte count
range provides greater flexibility. For this reason, the position of the byte count register (BCR) in the memory
map depends on whether a 16- or 24-bit byte counter is chosen. The selection is made by programming
MPARK[BCR24BIT] in the SIM module.
In the new MCF5307, the 24-bit byte count can be selected by setting BCR24BIT = 1, making DCR[AT]
available. The AT bit selects whether the DMA channels assert an acknowledge during the entire transfer or
only at the final transfer of a DMA transaction.
New applications should take advantage of the full range of the 24-bit byte counter, including the AT bit. The
16-bit byte count option (BCR24BIT = 0) is kept to retain compatibility with older revisions of the MCF5307.
0x394
DMA status register 3
DMA interrupt vector
DMA interrupt vector
register 2 (DIVR2)
register 3 (DIVR3)
(DSR3) [p. 12-10]
Byte count register 3 (BCR24BIT = 0)
Reserved
[p. 12-11]
[p. 12-11]
[31:24]
Table A-10. DMA Controller Registers (Continued)
Freescale Semiconductor, Inc.
For More Information On This Product,
Appendix A. List of Memory Maps
Destination address register 3 (DAR3) [p. 12-7]
Source address register 3 (SAR3) [p. 12-6]
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DMA control register 3 (DCR3) [p. 12-8]
[23:16]
Byte count register 3 (BCR24BIT = 1)
1
Reserved
Reserved
Reserved
[15:8]
Reserved
1
(BCR3) [p. 12-7]
[7:0]
A-9