W83781D Datasheet, PDF (21/53 Pages) Winbond – MONITORING IC

8. CONTROL AND STATUS REGISTERS
W83781D
PRELIMINARY
8.1 Address Register (Port x5h)
The main register is the INDEX Register located at Port x5h. The bit designations are as follows:
7 6 5 4 32 1 0
INDEX Pointer
Busy
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 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 of Control and Status Registers. See the tables below for detail.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Busy
Index Pointer (Power On default 00h)
(Power On default 0)
A6
A5
A4
A3
A2
Bit 1
A1
Bit 0
A0
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Publication Release Date : Nov. 1997
Revision 0.60