LM78 National Semiconductor, LM78 Datasheet - Page 26

• Manufacturer Part Number: LM78
• Description: Microprocessor System Hardware Monitor
• Manufacturer: National Semiconductor

www.national.com
Bit
Bit
Bit
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Functional Description
13.4 Interrupt Status Register 1 — Address 41h
Power on default
13.5 Interrupt Status Register 2 — Address 42h
Power on default
13.6 SMI Mask Register 1 — Address 43h
Power on default
IN4
-IN5
-IN6
FAN3
Chassis Intrusion
FIFO Overflow
SMI__IN
Reserved
IN0
IN1
IN2
IN3
Temperature
BTI
FAN1
FAN2
IN0
IN1
IN2
IN3
Temperature
BTI
FAN1
FAN2
Name
Name
Name
<
<
<
7:0
7:0
7:0
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
>
>
>
Read/
Write
= 00h
= 00h
= 00h
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read Only
Read/Write
A one disables the corresponding interrupt status bit for SMI interrupt.
A one disables the corresponding interrupt status bit for SMI interrupt.
A one disables the corresponding interrupt status bit for SMI interrupt.
A one disables the corresponding interrupt status bit for SMI interrupt.
A one disables the corresponding interrupt status bit for SMI interrupt.
A one disables the corresponding interrupt status bit for SMI interrupt.
A one disables the corresponding interrupt status bit for SMI interrupt.
A one disables the corresponding interrupt status bit for SMI interrupt.
A one indicates a High or Low limit has been exceeded.
A one indicates a High or Low limit has been exceeded.
A one indicates a High or Low limit has been exceeded.
A one indicates a High or Low limit has been exceeded.
A one indicates a High or Low limit has been exceeded.
A one indicates an interrupt has occurred from the Board Temperature Interrupt (BTI)
input (O.S. output of multiple LM75 chips).
A one indicates the fan count limit has been exceeded.
A one indicates the fan count limit has been exceeded.
(Continued)
A one indicates a High or Low limit has been exceeded.
A one indicates a High or Low limit has been exceeded.
A one indicates a High or Low limit has been exceeded.
A one indicates the fan count limit has been exceeded.
A one indicates Chassis Intrusion has gone high.
A one indicates an overflow in FIFO (POST RAM) i.e. 32nd location in FIFO has
been written via Port x0h or x4h.
A one indicates SMI__IN has gone low.
26
Description
Description
Description