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參數(shù)資料
型號: W83877AF
廠商: WINBOND ELECTRONICS CORP
元件分類: 外設(shè)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(shù): 113/171頁
文件大小: 1634K
代理商: W83877AF
W83877AF
Publication Release Date: Dec. 1996
Preliminary Version 0.52
- 111 -
Bit 7: Reserved
OSCS2 (Bit 6): This bit and OSCS1, OSCS0 (bit 1, 0 of CR0) select one of the W83877AF's power-
down functions. Refer to descriptions of CR0. (Default to be 0)
SEL4FDD (Bit 5): Selects four FDD mode
0
1
Selects two FDD mode (default, see Table 8-2)
Selects four FDD mode
DSA, DSB,
MOA and MOB output pins are encoded as show in Table 8-3 to select
four drives.
Table 8-2
DO REGISTER ( 3F2H )
MOB
MOA
DSB
DSA
DRIVE
Bit 7
Bit 6
Bit 5
Bit 4
Bit 1
Bit 0
SELECTED
0
0
0
0
0
0
1
1
1
1
--
0
0
0
1
0
0
1
0
1
0
FDD A
0
0
1
0
0
1
0
1
0
1
FDD B
0
1
0
0
0
1
1
1
1
1
--
1
0
0
0
1
1
1
1
1
1
--
Table 8-3
DO REGISTER ( 3F2H )
MOB
MOA
DSB
DSA
DRIVE
SELECTED
Bit 7
Bit 6
Bit 5
Bit 4
Bit 1
Bit 0
0
0
0
0
X
X
1
1
x
x
--
0
0
0
1
0
0
0
0
0
0
FDD A
0
0
1
0
0
1
0
0
0
1
FDD B
0
1
0
0
1
0
0
0
1
0
FDD C
1
0
0
0
1
1
0
0
1
1
FDD D
FIPURDWN (Bit 4):
This bit controls the internal pull-up resistors of the FDC input pins RDATA, INDEX, TRAK0,
DSKCHG, and WP.
0
The internal pull-up resistors of FDC are turned on. (default)
1
The internal pull-up resistors of FDC are turned off.
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