PIN #
BUFFER
TYPE
I/OD12
NAME
SYMBOL
DESCRIPTION
TQFP
57
QFP
59
SLCT
This high active output from the printer indicates that
it has power on. Bit 4 of the Printer Status Register
Printer
Selected
Status
reads the SLCT input.
Refer to Parallel Port
description for use of this pin in ECP and EPP mode.
nERROR
PD0-4
A low on this input from the printer indicates that there
is a error condition at the printer. Bit 3 of the Printer
Status register reads the nERR input. Refer to
Parallel Port description for use of this pin in ECP and
EPP mode.
73
75
nError
I/OD12
Port Data 0-4
69-66, 64 71-68, 66 Port Data 0-
Port Data 4
IOP14/IS
IOP14
63
62
65
64
Port Data 5
Port Data 6
PD5
PD6
Port Data 5
Port Data 6
IOP14/
OD12
61
63
Port Data 7
PD7
IOP14
MISC
ICLK
Port Data 7
18
92
20
94
14.318 MHz
Input Clock
CLK14
nADRX
The external connection to a single source 14.318
MHz clock.
Active low address decode out: used to decode a 1,
8, or 16 byte address block. (An external pull-up is
required). Refer to Configuration registers CR03,
CR08 and CR09 for more information.
The interrupt request from a logical device or IRQIN
may be output on IRQ_B. Refer to the configuration
registers for more information. If EPP or ECP Mode
is enabled, this output is pulsed low and released to
allow sharing of interrupts.
Address X/
O12/ OD12
Interrupt
Request B
IRQ_B
PWRGD
This active high input indicates that the power (VCC)
is valid. For device operation PWRGD must be
active. When PWRGD is inactive, all inputs are
disconnected and put into a low power mode; all
outputs are put into high impedance. The contents af
all registers are preserved as long as VCC is valid.
The output driver current drain when PWRGD is
inactive mode drops to ISTBY - standby current.
56
58
Power Good
I/O4
96
98
External
IRQIN
IS
This pin is used to steer an interrupt signal from an
Interrupt Input
external device onto one of eight IRQ outputs IRQA-
H.
POWER INTERFACE
Positive Supply Voltage.
13,70
15,72
Power
Ground
VCC
VSS
4, 10, 11, 6, 12, 13,
Ground Supply.
12, 14, 15, 14, 16, 17,
23, 45,
65, 93
25, 47,
67, 95
1, 2, 3, 5, 1, 2, 3, 4,
6, 7, 8, 9, 5, 7, 8, 9,
16, 21, 24, 10, 11, 18,
Non Connect NC
Non-Connected Pins
99, 100
23, 26,
SMSC DS – SP37E760
Page 11
Rev. 04/13/2001
SMSC [ SMSC CORPORATION ]
