SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 280

• 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)
24.2.57
24.2.58
Note:
Register
Address
Register
Address
B7h
B8h
Each bit in this register is cleared on a write of 1 if the event is not active.
Read/
Read/
R/WC
Write
Write
R/W
Register B7h: Min Temp Adjust Enable Register
This register becomes read only when the Lock bit is set. Any further attempts to write to this register
shall have no effect.
This register is used to enable the Automatic Minimum Temperature Adjustment (AMTA) feature for
each zone. AMTA allows for an adjustment of the low temp limit temperature register for each zone
when the current temperature for the zone exceeds the Top Temperature. Bits[3:1] are used to enable
an adjustment of the low temp limit for each of zones 1-3.
This register also contains the bit (TOP_INT_EN) to enable an interrupt to be generated anytime the
top temp for any zone is exceeded. This interrupt is generated based on a bit in the Top Temp
Exceeded status register (0B8h) being set. Note that the INT_EN bit (register 7Ch) must also be set
for an interrupt to be generated on the THERM pin.
Note: The Zones are hardwired to the sensors in the following manner:
■
■
■
Register B8h: Top Temp Exceeded Status Register
Note: This register is reset to its default value when the PWRGD_PS signal transitions high.
The Top Temp Exceeded Status Register bits are automatically set by the device whenever the
temperature value in the reading register for a zone exceeds the value in the Top Temperature register
for the zone.
This register holds a bit set until the bit is written to 1 by software. The contents of this register are
cleared (set to 0) automatically by the device after it is written by software, if the temperature no longer
exceeds the value in the Top Temperature register for the zone. Once set, the Status bits remain set
until written to 1, even if the if the temperature no longer exceeds the value in the Top Temperature
register for the zone.
Note: If a bit is set in this register, an interrupt can be generated if the TOP_INT_EN bit (register
TMIN_ ADJ_ EN1 = Zone 1 = Remote Diode 1
TMIN_ ADJ_ ENA = Zone 2 = Ambient
TMIN_ ADJ_ EN2 = Zone 3 = Remote Diode 2
B7h) and, for the nHWM_INT pin to go active, the INT_EN bit (7Ch) is set.
Top Temp Exceeded Status
Tmin Adjust Enable
Register Name
Register Name
(MSb)
(MSb)
Bit 7
RES
Bit 7
DATASHEET
RES
LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
264
Bit 6
Bit 6
RES
RES
Bit 5
RES
Bit 5
RES
Bit 4
RES
Bit 4
RES
TMIN
ADJ_
Bit 3
Bit 3
EN2
RES
_
TMIN
ADJ_
Bit 2
Bit 2
EN1
STS2
_
TMIN
ADJ_
Bit 1
Bit 1
ENA
STS1
_
SMSC SCH311X
(LSb)
TOP_
(LSb)
Bit 0
INT_
Bit 0
STSA
EN
Datasheet
Default
Default
Value
Value
00h
00h