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參數(shù)資料
| 型號(hào)： | LM78 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Microprocessor System Hardware Monitor |
| 中文描述： | 微處理器系統(tǒng)硬件監(jiān)視器 |
| 文件頁(yè)數(shù)： | 14/31頁(yè) |
| 文件大?。?/td> | 424K |
| 代理商： | LM78 |
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Functional Description
(Continued)
2.1 Internal Registers of the LM78
TABLE 1. The internal registers and their corresponding internal LM78 address is as follows:
Register
LM78 Internal Hex
Address
(This is the data to be
written to Port x5h)
40h
41h
Power on
Value
Notes
Configuration Register
Interrupt Status Register 1
0000 1000
0000 0000
Auto-increment to the address of Interrupt Status
Register 2 after a read or write to Port x6h.
Interrupt Status Register 2
SMI Mask Register 1
42h
43h
0000 0000
0000 0000
Auto-increment to the address of SMI Mask
Register 2 after a read or write to Port x6h.
SMI Mask Register 2
NMI Mask Register 1
44h
45h
0000 0000
0000 0000
Auto-increment to the address of NMI Mask
Register 2 after a read or write to Port x6h.
NMI Mask Register 2
VID/Fan Divisor Register
46h
47h
0100 0000
0101 XXXX
The first four bits set the divisor for Fan
Counters 1 and 2. The lower four bits reflect the
state of the VID inputs.
Serial Bus Address Register
Chip Reset/ID Register
POST RAM
48h
49h
0010 1101
0100 0000
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
Value RAM
20h-3Fh
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 LM78 would consist of:
1.
Write to Port x5h the LM78 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
ascertain 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 LM78 Internal Address latches, and does not have to be written if it is already pointing at the desired register. The LM78
Internal Address Register is read/write (Bit 7 is read only).
L
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