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| 型號： | LM79CCVFX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 6/31頁 |
| 文件大?。?/td> | 469K |
| 代理商： | LM79CCVFX |
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Functional Description (Continued)
2.1 Internal Registers of the LM79
TABLE 1. The internal registers and their corresponding internal LM79 address is as follows:
Register
LM79 Internal Hex
Address
Power on
Value
Notes
(This is the data to be
written to Port x5h)
Configuration Register
40h
0000 1000
Interrupt Status Register 1
41h
0000 0000
Auto-increment to the address of Interrupt Status
Register 2 after a read or write to Port x6h.
Interrupt Status Register 2
42h
0000 0000
SMI Mask Register 1
43h
0000 0000
Auto-increment to the address of SMI Mask
Register 2 after a read or write to Port x6h.
SMI Mask Register 2
44h
0000 0000
NMI Mask Register 1
45h
0000 0000
Auto-increment to the address of NMI Mask
Register 2 after a read or write to Port x6h.
NMI Mask Register 2
46h
0100 0000
VID/Fan Divisor Register
47h
0101 XXXX
The first four bits set the divisor for Fan
Counters 1 and 2. The lower four bits reflect the
state of the VID0-VID3 inputs.
Serial Bus Address Register
48h
0010 1101
Chip Reset/VID4/Device
ID Register
49h
1100 000X
D7 identifies this device as the LM79. D0 reflects
the state of VID4.
POST RAM
00h-1Fh
Auto-increment when written to from Port x0h or
x4h. Auto-increment after a read or write to Port
x6h, with a separate pointer. Auto-incrementing
stops when address 1Fh is reached.
Value RAM
20h-3Fh
Value RAM
60h-7Fh
Auto-increment after a read or write to Port x6h.
Auto-incrementing stops when address 7Fh is
reached.
A typical communication with the LM79 would consist
of:
1.
Write to Port x5h the LM79 Internal Address (from col-
umn 2 above) of the desired register. Alternatively, when
both ISA and Serial Bus interfaces are used, the first
step in a communication may be to read Port x5h to as-
certain the state of the Busy bit to avoid contention with
an Serial Bus communication.
2.
Read or write the corresponding registers data with
reads/writes from Port x6h.
The LM79 Internal Address latches, and does not have to be
written if it is already pointing at the desired register. The
LM79 Internal Address Register is read/write (Bit 7 is read
only).
LM79
www.national.com
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