W83781D Nuvoton Technology Corporation of America, W83781D Datasheet - Page 19

• Manufacturer Part Number: W83781D
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83781D

• Lead Free Status / Rohs Status: Supplier Unconfirmed

8. CONTROL AND STATUS REGISTERS
8.1 Address Register (Port x5h)
The main register is the INDEX Register located at Port x5h. The bit designations are as follows:
Bit7: Read Only
The logical 1 indicates the device is busy because of a Serial Bus transaction or another ISA bus
transaction. With checking this bit, multiple ISA drivers can use W83781D/G without interfering with
each other or a Serial Bus driver.
It is the user's responsibility not to have a Serial Bus and ISA bus operations at the same time.
This bit is:
Set: with a write to Port x5h or when a Serial Bus transaction is in progress.
Reset: with a write or read from Port x6h if it is set by a write to Port x5h, or when the Serial Bus
transaction is finished.
Bit 6-0: Read/Write
Index Pointer (A6-A0)
Configuration Register
Interrupt Status Register 1
Interrupt Status Register 2
(Power On default 0)
INDEX of Control and Status Registers. See the tables below for detail.
Bit 7
Busy
Registers
7
Bit 6
A6
6
Bank
5
Bit 5
0
0
0
A5
4
in Hex
A6-A0
3
Index Pointer (Power On default 00h)
40h
41h
42h
Bit 4
A4
2
- 15 -
1
Power On Value
<7:0>in Binary
of Registers:
00001000
00000000
00000000
0
Bit 3
A3
Publication Release Date: April 14, 2005
INDEX Pointe
Busy
W83781D/W83781G
Bit 2
A2
Auto-increment to the
address of Interrupt Status
Register 2 after a read or
write to Port x6h.
Bit 1
A1
Notes
Revision 2.0
Bit 0
A0