ELANSC310 datasheet(33/119 Pages) AMD

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Élan™SC310 Microcontroller Data Sheet

PREL IMINARY

compatibility. In PC-compatible systems, this signal

can be driven by an 8042 keyboard controller, port 2,

bit 1.

For detailed information about the A20GATE signal,

see the

ÉlanTMSC300 and ÉlanSC310 Microcontrollers

GATEA20 Function Clarification Application Note,

order #21811.

Reset CPU (Input; Active Low)

This signal resets the internal CPU. In PC-compatible

systems, this signal can be driven by a keyboard con-

troller, port 2, bit 0.

SYSCLK [XTCLK]

System Clock (Output)

This clock can be used to provide a clock to a keyboard

controller. It is not synchronous to ISA bus cycles.

XTCLK is the PC/XT keyboard clock. For information

about internal clock states, see Table 22 on page 45.

For information about the maximum ISA bus option,

see page 56.

PARALLEL PORT INTERFACE

ACK

Printer Acknowledge (Input; Active Low)

The printer asserts ACK to confirm that the transfer

from the ÉlanSC310 microcontroller to the parallel port

was successful.

AFDT [X14OUT]

Auto Line Feed Detect (Output; Active Low)

This pin signals the printer to autofeed continuous form

paper. It can be programmed to become a 14.336-MHz

output.

BUSY

Printer Busy (Input; Active High)

The printer asserts BUSY when it is performing an

operation.

ERROR

(Input; Active Low)

The printer asserts the ERROR signal to inform the

parallel port of a deselect condition, PE, or other error

condition.

INIT

Initialize Printer (Output; Active Low)

This pin signals the printer to begin an initialization rou-

tine.

Paper End (Input; Active High)

The printer asserts this signal when it is out of paper.

PPDWE [PPDCS]

Parallel Port Write Enable (Output; Active Low)

The PPDWE signal is used to control the 374 type latch

in a unidirectional parallel port design. To support a bi-

directional parallel port design, this pin can be reconfig-

ured (PPDCS) to act as an address decode for the

parallel port data port. It can then be externally gated

with IOR and IOW to provide the Parallel Port Data

Read and Write Strobes, respectively.

For more information, see “Parallel Port” on page 51.

PPOEN

Parallel Port Output Buffer Enable

(Output; Active Low)

This signal supports a bidirectional parallel port design.

It is used to control the output enable of the Parallel

Port Output Buffer.

SLCT

Printer Select Return (Input; Active High)

The printer asserts SLCT when it has been selected.

SLCTIN

Printer Selected (Output; Active Low)

Asserting SLCTIN selects the line printer.

STRB

Strobe (Output; Active Low)

Asserting STRB signals the line printer to latch data

currently on the parallel port.

SERIAL PORT INTERFACE

CTS

Clear To Send (Input; Active Low)

This signal indicates that the external serial device is

ready to accept data.

DCD

Data Carrier Detect (Input; Active Low)

This signal indicates to the internal serial port controller

that the attached serial device has detected a data car-

rier.

DSR

Data Set Ready (Input; Active Low)

This signal is used to indicate that the external serial

device is ready to establish a communication link with

the internal serial port controller.

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