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USB97C100QFP 데이터시트(PDF) 31 Page - SMSC Corporation

부품명 USB97C100QFP
상세설명  Multi-Endpoint USB Peripheral Controller
PDF  64 Pages
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제조업체  SMSC [SMSC Corporation]
홈페이지  http://www.smsc.com
Logo SMSC - SMSC Corporation

USB97C100QFP 데이터시트(HTML) 31 Page - SMSC Corporation

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SMSC DS – USB97C100
Page 31
Rev. 01/03/2001
Runtime Registers
The DMA controller has a block of 16 R/W registers which normally occupy I/O locations 0x00-0x0F on the ISA bus.
When they are located at 0x0000-0x000F on the ISA bus, the 8051 can access them by programming the IOBASE
Register to 0x00, and reading or writing from 0x4000-0x400F.
Table 39 - 8237 Registers in ISA I/O Space
0x0000
Channel 0: Current Address H/L
0x0001
Channel 0: Byte Count H/L
0x0002
Channel 1: Current Address H/L
0x0003
Channel 1: Byte Count H/L
0x0004
Channel 2: Current Address H/L
0x0005
Channel 2: Byte Count H/L
0x0006
Channel 3: Current Address H/L
0x0007
Channel 3: Byte Count H/L
0x0008
Status/Command Register
0x0009
Write Request Register
0x000A
Write Single Mask Register
0x000B
Write Mode Register
0x000C
Clear Byte Ptr F/F - Read Temp
Register
0x000D
Master Clear
0x000E
Clear Mask
0x000F
Write All Mask Bits
Note: To write to these registers, HLDA must be logic low.



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