SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 254

• Manufacturer Part Number: SCH3112I-NE
• Description: LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
• Manufacturer: SMSC [SMSC Corporation]

Rev 0.2 (09-28-04)
24.2.12
Register
Address
BIT
0
1
2
3
4
5
6
7
42h
Diode 1 Limit
Diode 2 Limit
Sensor Limit
INT2 Event
Vccp_Error
2.5V_Error
VCC_Error
5V_Error
Remote
Remote
Internal
NAME
Read/
R/WC
Active
Write
Error
Error
Error
Register 42h: Interrupt Status Register 2
Notes:
■
■
The Interrupt Status Register 2 bits is automatically set by the device whenever a tach reading value
is above the minimum value set in the tachometer minimum registers or when a remote diode fault
occurs. When a remote diode fault occurs (if the start bit is set) 80h will be loaded into the associated
temperature reading register, which causes the associated diode limit error bit to be set (see
41h: Interrupt Status Register 1 on page
status bits remain set until the bit is written to one by software or until the individual enable bit is
cleared, even if the event no longer persists.
■
This register is reset to its default value when the PWRGD_PS signal transitions high.
This is a read/write-to-clear register. The status bits are cleared on a write of one if the event
causing the interrupt is no longer active. Writing a zero to these bits has no effect.
Clearing the status bits by a write of ‘1’
The FANTACHx status bits are cleared (set to 0) automatically by the SCH311X after they are
written to one by software, if the FANTACHx reading register no longer violates the programmed
FANTACH Limit. (See
59h: Fan Tachometer Low Limit on page
The ERRx status bits are cleared (set to 0) automatically by the SCH311X after they are written to
one by software, if the Diode Fault condition no longer exists. The remote diode fault bits do not
get cleared while the fault condition exists.
Interrupt Status Register
R/WC
R/WC
R/WC
R/WC
R/WC
R/WC
R/WC
R/WC
Register Name
R/W
2
DEFAULT
0
0
0
0
0
0
0
0
Registers 28-2Dh: Fan Tachometer Reading on page 232
The SCH311X automatically sets this bit to 1 when the 2.5V input voltage
is less than or equal to the limit set in the 2.5V Low Limit register or
greater than the limit set in the 2.5V High Limit register.
The SCH311X automatically sets this bit to 1 when the Vccp input voltage
is less than or equal to the limit set in the Vccp Low Limit register or
greater than the limit set in the Vccp High Limit register.
The SCH311X automatically sets this bit to 1 when the VCC input voltage
is less than or equal to the limit set in the VCC Low Limit register or
greater than the limit set in the VCC High Limit register.
The SCH311X automatically sets this bit to 1 when the 5V input voltage
is less than or equal to the limit set in the 5V Low Limit register or greater
than the limit set in the 5V High Limit register.
The SCH311X automatically sets this bit to 1 when the temperature input
measured by the Remote1- and Remote1+ is less than or equal to the
limit set in the Remote Diode 1 Low Temp register or greater than the limit
set in Remote Diode 1 High Temp register.
The SCH311X automatically sets this bit to 1 when the temperature input
measured by the internal temperature sensor is less than or equal to the
limit set in the Internal Low Temp register or greater than the limit set in
the Internal High Temp register.
The SCH311X automatically sets this bit to 1 when the temperature input
measured by the Remote2- and Remote2+ is less than or equal to the
limit set in the Remote Diode 2 Low Temp register or greater than the limit
set in the Remote Diode 1 High Temp register.
The device automatically sets this bit to 1 when a status bit is set in the
Interrupt Status Register 2.
(MSb)
ERR2
Bit 7
DATASHEET
ERR1
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
Bit 6
236) in addition to the diode fault bit (ERRx). These individual
238
242)
Bit 5
RES
FANTA
Bit 4
CH3
DESCRIPTION
FANTA
Bit 3
CH2
FANTA
Bit 2
CH1
Bit 1
RES
and
(LSb)
SMSC SCH311X
Bit 0
12V
Registers 54-
Datasheet
Register
Default
Value
00h