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參數(shù)資料
型號： 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
文件頁數(shù)： 28/31頁
文件大小： 424K
代理商： LM78
Functional Description
(Continued)
13.10 VID/Fan Divisor Register—Address 47h
Power on –
<
7:4
>
is 0101, and
<
3:0
>
is mapped to VID
<
3:0
>
Bit
3-0
5-4
Name
Read/Write
Read Only
Read/Write
Description
VID
<
3:0
>
FAN1 RPM
Control
The VID
<
3:0
>
inputs
FAN1 Speed Control.
<
5:4
>
= 00 - divide by 1;
<
5:4
>
= 01 - divide by 2;
<
5:4
>
= 10 - divide by 4;
<
5:4
>
= 11 - divide by 8.
FAN2 Speed Control.
7-6
FAN2 RPM
Control
Read/Write
<
7:6
>
= 00 - divide by 1;
<
7:6
>
= 01 - divide by 2;
<
7:6
>
= 10 - divide by 4;
<
7:6
>
= 11 - divide by 8.
13.11 Serial Bus Address Register—Address 48h
Power on default Serial Bus address
<
6:0
>
= 0101101 and
<
7
>
= 0 binary
Bit
6-0
Name
Read/Write
Read/Write
Description
Serial Bus
Address
Reserved
Serial Bus address
<
6:0
>
7
Read Only
13.12 Chip Reset/ID Register Address 49h
Power on default for the LM78-J
<
7:0
>
= 0100 0000; Power
on default for LM78
<
7:0
>
= 0000 0000.
Bit
0-4
Name
Reserved
Chip Reset
Device ID
Read/Write
Read Only
Read/Write
Read Only
Description
5
6
A one will reset all the registers of the LM78 to the power on default state.
When set the latest version of the LM78 the LM78-J is being used. When cleared
designates the old version of LM78.
7
Reserved
Read Only
13.13 POST RAM—Address 00h–1Fh
The address pointer for the POST RAM auto-increments when written to at Port x0h or x4h. Once the address pointer reaches
1Fh, a FIFO overflow interrupt will be generated and the FIFO will stop incrementing. Normal reads via Port x5h and x6h
auto-increment a separate pointer, and will not cause a FIFO overflow interrupt.
13.14 Value RAM—Address 20h–3Fh or 60h–7Fh (auto-increment)
Address A6–A0
Address A6–A0 with
Auto-Increment
60h
61h
62h
63h
64h
65h
66h
67h
68h
Description
20h
21h
22h
23h
24h
25h
26h
27h
28h
IN0 reading
IN1 reading
IN2 reading
IN3 reading
IN4 reading
-IN5 reading
-IN6 reading
Temperature reading
FAN1 reading
L
www.national.com
28
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