Epson LX-86TM Especificações descarregar pdf (Página 44)

REV.-A

Table 2-3. CPU Port Assignment (cent’d)

Port

,,0

Signal Line

Number Assignment

Name

Description

NMI

—

Non-maskable interrupt input.

The interrupt routine is executed

at the trailing edge of this signal. This pin is invalid because it

is tied to ground.

INT

— Interrupt input. The interrupt routine is executed at the leading

edge of this signal. This pin is invalid because it is tied to

ground.

MODE 1

— External memory space setting port. MODES 1 and O (pin 29)

are both pulled up to HIGH so that an external memory of 64K

bytes (addresses O through

FFFFH)

can be used.

RESET

Reset terminal. When this signal is LOW, the printer is reset,

and ports A through C and D are set to be high impedance

input ports, and port F is set to be an address output (start

address OH).

MODE O

—

Refer to pin 27, MODE 1.

x2 CPU external clock input. This printer is driven with a 14.74

—

MHz clock. The operation codes are fetched at approximately

1.3 MHz, and memory read/write operations are performed at

approximately 1.6 MHz.

Vss

—

Ground terminal.

—

Ground terminal for the A/D converter in the CPU.

ANO

SW2-1

Analog input port of the 8-bit A/D converter in the CPU. Reads

the states of DIP SW2-1 through SW2-3.

AN2

SW2-3

AN3

SW2-4 Analog input port of the 8-bit A/D converter in the CPU. Reads

the state of DIP

SW2-4. This signal line is connected to the

AUTO FEED XT signal line of the interface. When DIP

SW2-4

is ON, the automatic paper feed function is valid. When the

DIP switch is OFF, this function is controlled by a signal from

the host computer (not fixed).

AN4

—

Analog input port for the 8-bit A/D converter in the CPU.

Reads the

SLCT

IN signal from the interface. When the

SLCT-

~ signal is HIGH, DC

l/DC3

control from the host computer is

valid. When it is LOW, DC

l/DC3

control is ignored, and the

printer is always selected as a device. (The signal can be tied

LOW using jumper J 1.)

AN5

+24 Analog input port for the 8-bit A/D converter in the CPU.

Monitors the +24 V voltage and controls the printhead drive

pulse width.

AN6 -

—

Not used.

AN7 -

—

Not used.

VAREF

—

Reference voltage input for the 8-bit A/D converter in the CPU.

43 AV

—

Power supply input for the 8-bit A/D converter in the CPU.

Memory read timing strobe signal. Connected to the RD strobe

terminal of the gate array and the output enable terminal of

the ROM and RAM.

2-12

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 141 142

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