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参数资料
型号： PC87393F-VJG
厂商： NATIONAL SEMICONDUCTOR CORP
元件分类： 外设及接口
英文描述： 100-Pin LPC SuperI/O Devices for Portable Applications
中文描述： MULTIFUNCTION PERIPHERAL, PQFP100
封装： TQFP-100
文件页数： 63/148页
文件大小： 1733K
代理商： PC87393F-VJG
1.0 Signal/Pin Connection and Description (Continued)
21
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1.5.8
Parallel Port
1.5.9
Power and Ground
Signal
Pin/s
I/O
Buffer Type Power Well
Description
ACK
41
I
INT
VDD
Acknowledge. Pulsed low by the printer to indicate that it has
received data from the Parallel Port.
AFD_DSTRB 53
O
OD14,O14/14
VDD
AFD - Automatic Feed. When low, instructs the printer to
automatically feed a line after printing each line. This pin is in
TRI-STATE after a 0 is loaded into the corresponding control
register bit. An external 4.7 K
pull-up resistor should be
attached to this pin.
DSTRB - Data Strobe (EPP). Active low, used in EPP mode
to denote a data cycle. When the cycle is aborted, DSTRB
becomes inactive (high).
BUSY_WAIT 40
I
INT
VDD
Busy. Set high by the printer when it cannot accept another
character.
Wait. In EPP mode, the Parallel Port device uses this active
low signal to extend its access cycle.
ERR
51
I
INT
VDD
Error. Set active low by the printer when it detects an error.
INIT
49
O
OD14,O14/14
VDD
Initialize. When low, initializes the printer. This signal is in
TRI-STATE after a 1 is loaded into the corresponding control
register bit. Use an external 4.7 K
pull-up resistor.
PD7-3,
PD2, PD1
PD0
42-46,
48, 50,
52
I/O
INT
O14/14
VDD
Parallel Port Data. Transfer data to and from the peripheral
data bus and the appropriate Parallel Port data register. These
signals have a high current drive capability.
PE
37
I
INT
VDD
Paper End. Set high by the printer when it is out of paper. This
pin has an internal weak pull-up or pull-down resistor.
SLCT
36
I
INT
VDD
Select. Set active high by the printer when the printer is
selected.
SLIN_ASTRB 47
O
OD14,O14/14
VDD
SLIN - Select Input. When low, selects the printer. This signal
is in TRI-STATE after a 0 is loaded into the corresponding
control register bit. Uses an external 4.7 K
pull-up resistor.
ASTRB - Address Strobe (EPP). Active low, used in EPP
mode to denote an address or data cycle. When the cycle is
aborted, ASTRB becomes inactive (high).
STB_WRITE 54
O
OD14,O14/14
VDD
STB - Data Strobe. When low, Indicates to the printer that
valid data is available at the printer port. This signal is in TRI-
STATE after a 0 is loaded into the corresponding control
register bit. An external 4.7 K
pull-up resistor should be
employed.
WRITE - Write Strobe. Active low, used in EPP mode to
denote an address or data cycle. When the cycle is aborted,
WRITE becomes inactive (high).
PNF
35
I
INT
VDD
Printer Not Floppy. This signal selects the internal logical
device that is connected to the PPM pins. For details on
setting PNF polarity, see Section 2.10.6.
Signal
Pin/s
I/O Buffer Type Power Well
Description
VDD
14, 39,
63, 88
I
PWR
-
Main 3.3V Power Supply
VSS
13, 38,
64, 89
I
GND
-
Ground
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PC87393VJG 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:IC, SUPER I/O DEVICE, TQFP-100, Logic Device Type:Buffer, Supply Voltage Min:3V,
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