STPC12GDYI datasheet(25/111 Pages) STMICROELECTRONICS

25 / 111 page

PIN DESCRIPTION

Issue 1.0 - July 24, 2002

25/111

MCLK, Mouse Clock line. Mouse data is latched

by the controller on each negative clock edge

produced on this pin. The mouse can be disabled

by pulling this pin low by software control.

MDATA,

Mouse Data Line. 11-bits of data are

shifted serially through this line when data is being

transferred. Data is synchronised to MCLK.

2.2.15. PARALLEL PORT

PE Paper End. Input status signal from printer.

SLCT Printer Select. Printer selected input.

BUSY# Printer Busy.

Input status signal from printer.

ERR# Error. Input status signal from printer.

ACK# Acknowledge.

Input status signal from printer.

PDDIR# Parallel Device Direction.

Bidirectional control line output.

STROBE# PCS/Strobe#.

Data transfer strobe line to printer.

INIT# Initialize Printer. This output sends an

initialize command to the connected printer.

AUTOFD# Automatic Line feed. This output sends

command

the

connected

printer

automatically generate line feed on received

carriage returns.

SLCTIN#

Select In. Printer select output.

PPD[7-0] Parallel Port Data Lines Data transfer

lines to printer. Bidirectional depending on modes.

2.2.16. MISCELLANEOUS

SPKRD Speaker Drive. This is the output to the

speaker and is the AND of the counter 2 output

with bit 1 of Port 61h and drives an external

speaker driver. This output should be connected

to a 7407 type high voltage driver.

SCAN_ENABLE

Reserved. This pin is reserved

for Test and Miscellaneous functions. It has to be

set to ‘0’ or connected to ground in normal

operation.

COL_SEL Colour Select. Can be used for Picture

in Picture function. Note however that this signal,

brought out from the video pipeline, is not in sync

with the VGA output signals, i.e. the VGA signals

run four clock cycles after the Col_Sel signal.

2.2.17. JTAG INTERFACE

TCLK Test clock

TDI Test data input

TMS Test mode input

TDO Test data output

TRST Test reset input

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