Memory Circuits; Fig. .: Memory Connection Scheme - ELCOM Euro-2500 Series Service Manual

Service manual
Pin  Description
 PAP
 TC
 HU
 POSUC
 POSZU
 SW
 BUZZER
 GND
 KB-CLK
 RSI
 IRQu
 IRQtl
 CS
 GND
 AP
 BP
 PRINTMOD
 PRINTMOD
 CS
 CS
 CS
 A
Tab. .: Pin description for E-N (cntd.)
.. Memory circuits
ECR memory used by the microcontroller is divided into two basic parts:
• programme memory
• data memory
The programme storage is provided by the EPROM memory of the  kB capacity, which is activated using the CS signal.
The data memory uses the static RAM (SRAM) of the  kB capacity, which is activated using the CS signal. The ECR acces-
sories also contain the SRAM extension module that extends the ECR memory by up to  ×  kB RAM.
The Euro-TX ECR uses the memory circuits with ultra low input that lower the power supply demands and significantly
prolong the memory power backup via the accumulator. Exchange of these memory circuits with others with the same ca-

Type Signal description
I Scanning paper ribbon presence in printer
I Scanning printer head temperature
I Scanning printer head machinery position
I Receipt shifting request
I Journal shifting request
I Scanning auto cutter final position
O Buzzer control
I GND
I Clock impulse input from external PC keyboard
I Interruption from serial channel for PC
I Interruption from USB/UART circuit
I Interruption from ribbon shifting buttons
O Program memory activation
I GND
O Control of .direct phase of . printer stepping motor
O Control of .direct phase of . printer stepping motor
O -bit of printing mode control
O -bit of printing mode control
O USB/UART, RTC, LATCH activation
O DUART activation
O RAM memory activation
O Address conductor
Fig. .: Memory connection scheme
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