EMC6D100-DK SMSC [SMSC Corporation], EMC6D100-DK Datasheet - Page 65

• Manufacturer Part Number: EMC6D100-DK
• Description: ENVIRONMENTAL MONITORING AND CONTROL DEVICE WITH AUTOMATIC FAN CAPABILITY
• Manufacturer: SMSC [SMSC Corporation]

REGISTER
ADDRESS
Environmental Monitoring and Control Device
Datasheet
8.33
SMSC EMC6D100/EMC6D101
81h
Bit[4]
FAN4 Event Enable
Bit[5]
Temp Interrupt Enable
Bit[6]
Ambient Event Enable
Bit[7]
Reserved
These bits are defined as follows:
0=disable
1=enable.
See the figure in the “Interrupt Status Registers” section.
Register 81h: TACH_PWM Register
These registers become read only when the Lock bit is set. Any further attempts to write to these
registers shall have no effect.
This register is used to associate a PWM with a tachometer input. This association is used by the fan logic
to determine when to prevent a bit from being set in the interrupt status registers.
The fan tachometer will not cause a bit to be set in the interrupt status register:
a)
b)
Note: A bit will never be set in the interrupt status for a fan if its tachometer minimum is set to FFFFh.
See bit definition below.
Bits[1:0] Tach1. These bits determine the PWM associated with this Tach. See bit combinations below.
Bits[3:2] Tach2. These bits determine the PWM associated with this Tach. See bit combinations below.
Bits[5:4] Tach3. These bits determine the PWM associated with this Tach. See bit combinations below.
Bits[7:6] Tach4. These bits determine the PWM associated with this Tach. See bit combinations below.
WRITE
READ/
R/W
if the current value in Current PWM Duty registers is 00h or
if the fan is disabled via the Fan Configuration Register.
Interrupt Select
Tach/PWM
REGISTER
NAME
Fan
(MSB)
BIT 7
T4H
DATASHEET
BIT 6
T4L
Page 65
BIT 5
T3H
BIT 4
T3L
BIT 3
T2H
BIT 2
T2L
BIT 1
T1H
(LSB)
BIT 0
T1L
Rev. 09-09-04
DEFAULT
VALUE
A4h