ETL9444 Datasheet, PDF (1/27 Pages) STMicroelectronics – 4-BIT NMOS MICROCONTROLLERS

ETL9444/ETL9445
ETL9344/ETL9345
4-BIT NMOS MICROCONTROLLERS
. LOW COST
. POWERFUL INSTRUCTION SET
. 2k x 8 ROM, 128 x 4 RAM
. 23 I/O LINES (ETL9444)
. TRUE VECTORED INTERRUPT, PLUS RES-
TART
. THREE-LEVEL SUBROUTINE STACK
. 16µs INSTRUCTION TIME
. SINGLE SUPPLY OPERATION (4.5-6.3V)
. LOW CURRENT DRAIN (13mA max.)
. INTERNAL TIME-BASE COUNTER FOR REAL-
TIME PROCESSING
. INTERNAL BINARY COUNTER REGISTER
WITH MICROWIRE® SERIAL I/O CAPABILITY
. GENERAL PURPOSE AND TRI-STATE^® OUT-
PUTS
. LSTTL/CMOS COMPATIBLE IN AND OUT
. DIRECT DRIVE OF LED DIGIT AND SEGMENT
LINES
. SOFTWARE/HARDWARE
COMPATIBLE
WITH OTHER MEMBERS OF ET9400 FAMILY
. EXTENDED TEMPERATURE RANGE DE-
VICES
ETL9344/L9345 (– 40°C to + 85°C)
. WIDER SUPPLY RANGE (4.5 – 9.5V)
OPTIONALLY AVAILABLE
. SOIC 24/28 AND PLCC 28 PACKAGES AVAI-
LABLE
ETL9444/ETL9344
N
(Plastic Package)
ETL9345/ETL9345
N
(Plastic Package)
PIN CONNECTION
D E SC RI PT I O N
The ETL9444/L9445 and ETL9344/L9345 Single-
Chip N-Channel Microcontrollers are fully compati-
ble with the COPS® family, fabricated using
N-channel, silicon gate XMOS technology. They are
complete microcomputers containing all system ti-
ming, internal logic, ROM, RAM and I/O necessary
to implement dedicated control functions in a variety
of applications. Features include single supply ope-
ration, a variety of output configuration options, with
an instruction set, internal architecture and I/O
scheme designed to facilitate keyboard input, dis-
play output and BCD data manipulation. The
ETL9445 is identical to the ETL9444, except with 19
I/O lines instead of 23 : They are an appropriate
choice for use in numerous human interface control
environments. Standard test procedures and relia-
ble high-density fabrication techniques provide the
medium to large volume customers with a customi-
May 1989
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