IT8712F datasheet(34/189 Pages) ITE

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IT8712F V0.81

IT8712F

Pin(s) No.

Symbol

Attribute

Power

Description

option

128

CTS2#

VCC

Clear to Send 2 #.

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.

127

RI2#

VCC

Ring Indicator 2 #.

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

126

DCD2#

VCC

Data Carrier Detect 2 #.

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.

Table 5-10. Pin Description of Parallel Port Signals

Pin(s) No.

Symbol

Attribute

Power

Description

100

SLCT

VCC

Printer Select.

This signal goes high when the line printer has been

selected.

101

VCC

Printer Paper End.

This signal is set high by the printer when it runs out of paper.

102

BUSY

VCC

Printer Busy.

This signal goes high when the line printer has a local

operation in progress and cannot accept data.

103

ACK#

VCC

Printer Acknowledge #.

This signal goes low to indicate that the printer has already

received a character and is ready to accept another one.

104

SLIN#

DIO24

VCC

Printer Select Input #.

When the signal is low, the printer is selected. This signal is

derived from the complement of bit 3 of the printer control

105

INIT#

DIO24

VCC

Printer Initialize #.

When the signal is low, the printer is selected. This signal is

derived from the complement of bit 3 of the printer control

106

ERR#

VCC

Printer Error #.

When the signal is low, it indicates that the printer has

encountered an error. The error message can be read from

bit 3 of the printer status register.

107

AFD#

DIO24

VCC

Printer Auto Line Feed #.

When the signal is low, it is derived from the complement of

bit 1 of the printer control register and is used to advance one

line after each line is printed.

108

STB#

VCC

Printer Strobe #.

When the signal is low, it is the complement of bit 0 of the

printer control register and is used to strobe the printing data

into the printer.

109 – 116

PD[0:7]

DIO24

VCC

Parallel Port Data [0:7].

This bus provides a byte-wide input or output to the system.

The eight lines are held in a high impedance state when the

port is deselected.

IT8712F Datasheet(PDF) 34 Page - ITE Tech.Inc.

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