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參數資料
型號: W83877AF
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設及接口
英文描述: Multi-Function I/O Port Controller(多功能輸入/輸出口控制器)
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封裝: QFP-100
文件頁數: 109/171頁
文件大小: 1634K
代理商: W83877AF
W83877AF
Publication Release Date: Dec. 1996
Preliminary Version 0.52
- 107 -
8.2.2 Configuration Register 1 (CR1), default = 00H
When the device is in Extended Function mode and EFIR is 01H, the CR1 register can be accessed
through EFDR. The bit definitions are as follows:
7 6 5 4 3 2 1 0
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
ABCHG
Bit 0-bit 6: Reserved.
ABCHG (Bit 7):
This bit enables the FDC AB Change Mode. Default to be enabled at power-on reset.
0
1
Drives A and B assigned as usual
Drive A and drive B assignments exchanged
8.2.3 Configuration Register 2 (CR2), default = 00H
When the device is in Extended Function mode and EFIR is 02H, the CR2 register can be accessed
through EFDR. The bit definitions are as follows:
7 6 5 4 3 2 1 0
CEA
EA3
EA4
EA5
EA6
EA7
EA8
EA9
When the W83877AF is programmed into extension adapter mode, the contents of this register are a
base address for the extension adapter. When base addresses EA3-EA9 are written into CR2, both
the
XRD
and
XWR
pins will be active low simultaneously and an adapter connected to the parallel
port can latch the same base address through pins XD1-XD7. After the base address is latched into
CR2, a subsequent read/write cycle to this
same base address will
generate an
XRD
or
XWR
signal.
If CEA is set to 0, then the W83877AF will compare system addresses SA9-SA3 with EA9-EA3 to
generate a compare-equal signal for this read/write command to access the Extension adapter. If
CEA is set to 1, then only EA9-EA4 are used in this comparison.
相關PDF資料
PDF描述
W83877ATD enhanced version from Winbonds most popular I/O chip W83877F
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相關代理商/技術參數
參數描述
W83877ATD 制造商:WINBOND 制造商全稱:Winbond 功能描述:enhanced version from Winbonds most popular I/O chip W83877F
W83877ATF 制造商:WINBOND 制造商全稱:Winbond 功能描述:enhanced version from Winbonds most popular I/O chip W83877F
W83877F 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O
W83877TD 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O
W83877TF 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O