Maintenance Manual Electronic Hardware Overview
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Port (PORT)
Up to 53 port pins are available. Port pin and control pin functions can be selected for use.
Port 0 - EEPROM selection,clock and data input lines
- PCMCIA Memory Card line
- Alternance motor front tractor lines
- Alternance motor rear tractor lines
Port 1 - Prefault line
- EEPROM data output line
- Home position and ribbon sensors line
- PCMCIA interface ready/busy line
- Expansion interface line
- Parallel interface input line (INIT)
Port 2 - Memory card address line
- PSRAM resfresh and address lines
- Paper sensors driving lines
- DMA request for fir configuration request line
Port 3 - Serial synchronous I/F lines (CLOCK, TX, RX)
- Enable serial synch. lines for O.P. and options
- Serial asynchronous I/F lines (CTS, TX, RX)
Port 4 - Parallel host data lines
Port 5 - Parallel Host input and output lines (STROBE, ACK, BUSY)
Port 6 - Outputs lines from analog MUX
Head temperature
Single sheet presence
Front fanfold presence
Rear fanfold presence
- Board type line
- Optional voltage reference line
Port 7 - Carriage motor enable and phase lines
- Ribbon motor reference and phase lines
Port 8 - DMA request for "clear bit map" and needles configuration
Realtime Output Port (RTOP)
This block is a reltime output port to be triggered with an interrupt from timer 0. it can
output 8-bit buffer register contents in 4-bit or 8-bit units at a programmable interval.
System Control (SC)
This block generates 1/2, 1/4, 1/8, 1/16 specific frequencies of the crystal or ceramic
resonator connected to the X1 and X2 pins and supplies them as CPU operation clocks.
Also generates the master reset for the correct synchronization of all logic devices.
Software Interval Timer (SIT)
A 16-bit software interval timer is incorporated as one for software timer or clock functions.
It can set interval interrupts by selecting the input clock (count clock) and setting the
software timer counter compare register.
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LA400 Multiprinter 3. 7 ER-LA400-SV
Содержание LA400
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