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ETL9444

4-BIT NMOS MICROCONTROLLERS

STMicroelectronics 

ETL9444/9445–ETL9344/9345

Figure 2 : Connection Diagrams.

Pin

L 7-L 0

G 3-G0

D 3-D 0

IN 3-IN 0

SI

SO

SK

CKI

CKO

RESET

VCC

GND

Description

8 Bidirectional I/O Ports with TRI-STATE®

4 Bidirectional I/O Ports

4 General Purpose Outputs

4 General Purpose Inputs (COP444L only)

Serial Input (or counter input)

Serial Output (or general purpose output)

Logic-controlled Clock (or general purpose output)

System Oscillator Input

System Oscillator Output (or general purpose input, RAM power supply, or SYNC input)

System Reset Input

Power Supply

Ground

Figure 3 : Input/output Timing Diagrams (crystal divide-by-16 mode).

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