STPCC03 Просмотр технического описания (PDF) - STMicroelectronics

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STPCC03

PC Compatible Embeded Microprocessor

STMicroelectronics 

PIN DESCRIPTION

2.2.11 MISCELLANEOUS

SPKRD Speaker Drive. This the output to the

speaker and is AND of the counter 2 output with

bit 1 of Port 61, and drives an external speaker

driver. This output should be connected to 7407

type high voltage driver.

SCL, SDA I C Interface. These bidirectional pins

are connected to CRTC register 3Fh to implement

DDC capabilities. They conform to I2C electrical

specifications, they have open-collector output

drivers which are internally connected to VDD

through pull-up resistors.

They can be used for the DDC1 (SCL) and DDC0

(SDA) lines of the VGA interface.

SCAN_ENABLE Reserved. The pin is reserved

for Test and Miscellaneous functions.

20/51

Release B

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

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