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ELANSC520 Datasheet(PDF) 189 Page - Advanced Micro Devices

Part # ELANSC520
Description  Microcontroller
PDF  440 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

ELANSC520 Datasheet(HTML) 189 Page - Advanced Micro Devices

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GP DMA Controller Registers
Élan™SC520 Microcontroller Register Set Manual
11-57
Slave DMA Clear Byte Pointer (SLDMACBP)
Direct-Mapped
I/O Address 000Ch
Register Description
This register channel provides a mechanism to adjust the byte pointer to the low byte of the memory address and
transfer count registers for Channels 0–3.
Bit Definitions
Programming Notes
7
6
5
4
3
2
1
0
Bit
SLAVE_CBP[7–0]
Reset
xxxxxxxx
R/W
W!
Bit
Name
Function
7–0
SLAVE_CBP
[7–0]
Slave DMA Clear Byte Pointer
The DMA controller’s 16-bit memory address and terminal count registers are accessed by
writing or reading consecutive 8-bit values to the same direct-mapped I/O address. A single
byte pointer is used across the slave DMA controller to determine which byte is accessed if
any of these 16-bit registers is read or written. Any access to one of these registers toggles
the byte pointer between the low and high bytes.
A write of any data to this bit field (SLAVE_CBP) clears the byte pointer so that the next
memory address or transfer count register access is to the low byte.



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