Intel III Xeon 733 MHz 80526KZ733256 User Manual
Product codes
80526KZ733256
PROCESSOR FEATURES
52
5.2.6.3 Status
Register
The status register shown in Table 42 indicates which (if any) thermal value thresholds have been exceeded.
It also indicates if a conversion is in progress or if an open circuit has been detected in the processor core
thermal diode connection. Once set, alarm bits stay set until a status register read clears them. A successful
read to the status register will clear any alarm bits that may have been set, unless the alarm condition
It also indicates if a conversion is in progress or if an open circuit has been detected in the processor core
thermal diode connection. Once set, alarm bits stay set until a status register read clears them. A successful
read to the status register will clear any alarm bits that may have been set, unless the alarm condition
persists
.
Table 42. Thermal Sensor Status Register
Bit Name
Function
7 (MSB)
BUSY
A one indicates that the device’s analog to digital converter is busy converting.
6
RESERVED
Reserved for future use
5
RESERVED
Reserved for future use
4
RHIGH
A one indicates that the processor core thermal diode high temperature alarm has
activated.
3
RLOW
A one indicates that the processor core thermal diode low temperature alarm has
activated.
2
OPEN
A one indicates an open fault in the connection to the processor core diode.
1
RESERVED
Reserved for future use.
0 (LSB)
RESERVED
Reserved for future use.
5.2.6.4 Configuration
Register
The configuration register controls the operating mode (standby vs. auto-convert) of the thermal sensor.
Table 43 shows the format of the configuration register. If the RUN/STOP bit is set (high) then the thermal
sensor immediately stops converting and enters standby mode. The thermal sensor will still perform analog to
digital conversions in standby mode when it receives a one-shot command. If the RUN/STOP bit is clear (low)
then the thermal sensor enters auto-conversion mode.
Table 43 shows the format of the configuration register. If the RUN/STOP bit is set (high) then the thermal
sensor immediately stops converting and enters standby mode. The thermal sensor will still perform analog to
digital conversions in standby mode when it receives a one-shot command. If the RUN/STOP bit is clear (low)
then the thermal sensor enters auto-conversion mode.
Table 43. Thermal Sensor Configuration Register
Bit Name
Reset
State
Function
7 (MSB)
RESERVED
0
Reserved for future use.
6
RUN/STOP
0
Standby mode control bit. If high, the device immediately stops
converting, and enters standby mode. If low, the device converts in
either one-shot mode or automatically updates on a timed basis..
5-0
RESERVED
0
Reserved for future use.
5.2.6.5 Conversion
Rate
Register
The contents of the conversion rate register determine the nominal rate at which analog to digital conversions
happen when the thermal sensor is in auto-convert mode. Table 44 shows the mapping between conversion
rate register values and the conversion rate. As indicated in Table 44, the conversion rate register is set to its
default state of 02h (0.25 Hz nominally) when the thermal sensor is powered up.
happen when the thermal sensor is in auto-convert mode. Table 44 shows the mapping between conversion
rate register values and the conversion rate. As indicated in Table 44, the conversion rate register is set to its
default state of 02h (0.25 Hz nominally) when the thermal sensor is powered up.
There is a ±25% error
tolerance between the conversion rate indicated in the conversion rate register and the actual conversion rate.
Table 44. Thermal Sensor Conversion Rate Register
Register Contents
Conversion Rate (Hz)
00h 0.0625
01h 0.125
02h 0.25