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IT8673F
7
Pin(s) No.
FAN Speed Controller Signals
65
FAN_CTL1
72
FAN_CTL2/
GP13
Signal
I/O
Power
Description
DOD8
DOD8/
DIOD8
VCC
VCC
FAN Control Output 1.
(PWM output signal to
FAN
’s FET.)
FAN Control Output 2 / General Purpose I/O 13.
The default function of this pin is
FAN
Control Output 2 (PWM
output signal to
FAN
’s FET).
The second function of this pin is the GP13.
The function configuration of this pin is decided by the GPIO
configuration registers.
FAN Tachometer Input 1.
(0 to +5V amplitude
FAN
tachometer
input)
FAN Tachometer Input 2 / General Purpose I/O 12.
The default function of this pin is
FAN
Tachometer Input 2. (0 to
+5V amplitude
FAN
tachometer input)
The second function of this pin is the GP12.
The function configuration of this pin is decided by the GPIO
configuration registers.
64
FAN_TAC1
DI
VCC
73
FAN_TAC2/
GP12
DI/
DIOD8
VCC
Serial Port 1 Signals
52
CTS1#
DI
VCC
Clear to Send 1 #.
When low, indicates that the MODEM or Data
Set is ready to accept data. The CTS# signal is a MODEM status
input whose condition can be tested by reading the MSR register.
Data Carrier Detect 1 #.
When low, indicates that the MODEM or
Data Set has detected a carrier. The DCD# signal is a MODEM
status input whose condition can be tested by reading the MSR
register
.
Data Set Ready 1 #.
When low, indicates that the MODEM or Data
Set is ready to establish a communications link. The DSR# signal is
a MODEM status input whose condition can be tested by reading the
MSR register.
Data Terminal Ready 1 # / Pin 96 Multiplex Select .
The default function of this pin is Data Terminal Ready 1 #. The
DTR# signal is used to indicate to the MODEM or Data Set that the
device is ready to exchange data. DTR# is activated by setting the
appropriate bit in the MCR register to 1. After a Master Reset
operation or during Loop mode, DTR# is set to its inactive state.
The second function of this pin is the power-on strapping of Pin 96
multiplex select. When high, the pin 96 is selected as SA15. This
pin is weak pull-up internally.
Ring Indicator 1 #.
When low, indicates that a telephone ring signal
has been received by the MODEM. The RI# signal is a MODEM
status input whose condition can be tested by reading the MSR
register.
Request to Send 1 # / Pin 95 Multiplex Select.
The default function of this pin is Request To Send 1 #. When low,
this output indicates to the MODEM or Data Set that the device is
ready to send data. RTS# is activated by setting the appropriate
bit in the MCR register to 1. After a Master Reset operation or
during Loop mode, RTS# is set to its inactive state.
The second function of this pin is the power-on strapping of Pin 95
multiplex select. When high, the pin 95 is selected as SA14. This
pin is weak pull-up internally.
Serial Data In 1.
This input receives serial data from the
communications link.
55
DCD1#
DI
VCC
50
DSR1#
DI
VCC
53
DTR1#/
PIN96SEL
DO8/DI
VCC
54
RI1#
DI
VCC
51
RTS1#/
PIN95SEL
DO8/DI
VCC
48
SIN1
DI
VCC