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2.7.4
Pin Description
Table 2-10
NS87336VLJ Pin Descriptions
Pin
No.
A15-A0
69, 66,
64:62,
31,
21:30
/ACK
85
ADRATE0,
98,
ADRATE1
48
/AFD
78
AEN
20
/ASTRB
81
BADDR0,
74,
BADDR1
73
BOUT1,
73
BOUT2
65
BUSY
84
CFG0
65
CFG1
71
I/O
Description
I
Address. These address lines from the microprocessor determine
which internal register is accessed. A0-A15 are don't cares during
DMA transfer.
I
Parallel Port Acknowledge. This input is pulsed low by the printer
to indicate that it has received the data from the parallel port. This
pin has a nominal 25 KΩ pull-up resistor attached to it.
O
FDD Additional Data Rate 0,1.
DRATE0, 1. They are provided in addition to DRATE0, 1. They
reflect the currently selected FDC data rate, (bits 0 and 1 in the
Configuration Control Register (CCR) or the Data Rate Select
Register (DSR), whichever was written to last).
configured when bit 0 of ASC is 1. ADRATE1 is configured when bit
4 of ASC is 1. (See IRQ5 and DENSEL for further information).
I/O
Parallel Port Automatic Feed XT.
printer automatically line feed after printing each line. This pin is in a
tristate condition 10 ns after a 0 is loaded into the corresponding
Control Register bit. The system should pull this pin high using a 4.7
KΩ resistor.
I
Address Enable.
selection via A15-A0. Access during DMA transfer is not affected by
this pin.
O
EPP Address Strobe. This signal is used in EPP mode as address
strobe. It is an active low signal.
I
Base Address. These bits determine one of the four base addresses
from which the Index and Data Registers are offset. An internal pull-
down resistor of 30 KΩ is on this pin. Use a 10 KΩ resistor to pull
this pin to VCC.
O
UARTs Baud Output.
associated serial channel Baud Rate generator output signal if the
test mode is selected in the Power and Test Configuration Register
and the DLAB bit (LCR7) is set. After the Master Reset, this pin
offers the SOUT function.
I
Parallel Port Busy. This pin is set high by the printer when it cannot
accept another character. It has a nominal 25 KΩ pull-down resistor
attached to it.
I
Configuration on Power-up.
default configurations in which the PC87336 powers up. An internal
pull-down resistor of 30 KΩ is on each pin. Use a 10 KΩ resistor to
pull these pins to VCC.
These outputs are similar to
When this signal is low, the
When this input is high, it disables function
This multi-function pin supports the
These CMOS inputs select 1 of 4
ADRATE0 is
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