SCH3112 Datasheet, PDF (284/396 Pages) SMSC Corporation – LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports

LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
Datasheet
The PWMx_n[1:0] configuration bits allow the autofan control logic to utilize the extended resolution
bits in the temperature reading. Increasing the precision reduces the programmable temperature range
that can be used to control the PWM outputs. For a description of the programmable temperature
ranges see Registers 5F-61h: Zone Temperature Range, PWM Frequency on page 244.
Note: Increasing the precision does not limit the range of temperature readings supported. The active
region for the autofan control is bound by the Minimum Zone Limit + Range, where the
Minimum Zone Limit can be any integer value from -127 to +127 degrees.
Table 24.18 Programming Options for the PWMX_N[1:0] Bits
PWMX_N[1:0]
00
01
10
11
DEGREE OF RESOLUTION
PER LSB USED IN AUTOFAN
1
0.5
0.25
Reserved
MAX THEORETICAL
TEMPERATURE RANGE
SUPPORTED
255
128.5
64.75
Reserved
MAX PROGRAMMABLE
TEMPERATURE RANGE
SUPPORTED
80
80
53.33
Reserved
Register E9-EEh: SMSC Test Registers
Register Read
Address /Write
E9h
R/W
EAh
R/W
EBh
R/W
ECh
R/W
EDh
R/W
EEh
R/W
Register Name
SMSC Test Register
SMSC Test Register
SMSC Test Register
SMSC Test Register
SMSC Test Register
SMSC Test Register
Bit 7
(MSb)
TST7
TST7
TST7
TST7
TST7
TST7
Bit 6
TST6
TST6
TST6
TST6
TST6
TST6
Bit 5
TST5
TST5
TST5
TST5
TST5
TST5
Bit 4
TST4
TST4
TST4
TST4
TST4
TST4
Bit 3
TST3
TST3
TST3
TST3
TST3
TST3
Bit 2
TST2
TST2
TST2
TST2
TST2
TST2
Bit 1
TST1
TST1
TST1
TST1
TST1
TST1
Bit 0
(LSb)
TST0
TST0
TST0
TST0
TST0
TST0
Default
Value
00h
00h
00h
00h
00h
00h
These are SMSC Test Registers. Writing to these registers may cause unwanted results.
24.2.71 Register FFh: SMSC Test Register
Register
Address
FFh
Read
/Write
R
Register
Name
SMSC Test Register
Bit 7
(MSb)
TST7
Bit 6
TST6
Bit 5
TST5
Bit 4
TST4
Bit 3
TST3
Bit 2
TST2
Bit 1
TST1
Bit 0
(LSb)
TST0
Default
Value
N/A
This register is an SMSC Test register.
Rev 0.2 (09-28-04)
268
DATASHEET
SMSC SCH311X