8-12
System Registers
Register: 0xFF11
Multipurpose I/O Bank 1 Enable (MPE1)
Read/Write
MPE1_[7:0]
Multipurpose I/O Bank 1 Enable
[7:0]
These bits control the output enables on the I/O pins
MPIO1_0, MPIO1_1, MPIO1_2, MPIO1_3, MPIO1_4,
MPIO1_5, MPIO1_6, and MPIO1_7. A value of 1 turns on
the pin driver, and a value of 0 3-states the pin. Because
this register powers up to all zeros, the pins will initially
be 3-stated at power-up. These pins also have internal
100
µ
A pull-down resistors, which can be disabled with
the
Multipurpose I/O Bank 3 Pull-down Enable (MPPE3)
register (
).
Register: 0xFF12
Multipurpose I/O Bank 1 Input (MPI1)
Read Only
MPI1_[7:0]
Multipurpose I/O Bank 1 Input
[7:0]
These read only bits read the live input values on the I/O
MPIO1_0, MPIO1_1, MPIO1_2, MPIO1_3, MPIO1_4,
MPIO1_5, MPIO1_6, and MPIO1_7.
7
6
5
4
3
2
1
0
MPE1_7
MPE1_6
MPE1_5
MPE1_4
MPE1_3
MPE1_2
MPE1_1
MPE1_0
Defaults:
0
0
0
0
0
0
0
0
7
6
5
4
3
2
1
0
MPI1_7
MPI1_6
MPI1_5
MPI1_4
MPI1_3
MPI1_2
MPI1_1
MPI1_0
Defaults:
0
0
0
0
0
0
0
0
Содержание Symbios SYM53C040
Страница 12: ...xii Preface...
Страница 90: ...4 18 SCSI and DMA Registers...
Страница 98: ...5 8 SFF 8067 Registers...
Страница 110: ...6 12 Two Wire Serial Registers...
Страница 126: ...7 16 Miscellaneous Registers...
Страница 160: ...8 34 System Registers...
Страница 184: ...9 24 Electrical Characteristics...
Страница 194: ...A 10 Register Summary...
Страница 214: ......