Maintenance Manual Electronic Hardware Overview
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3.1.2 Controller Overview
3.1.2.1 V55PI
µµ
Processor
The V55PI is microprocessor with a 16 bit CPU, a RAM, a serial interface, a parallel
interface, an A/D converter, a timer, a DMA controller, an interrupt controller and other
relevants units integrated in a single chip.
Therefore, it is best suited for data process systems including mechanical controls, such as
printers.
The V55PI µprocessor has the following functions:
•
16 bit internal architecture: 16/8 bit external data bus width selection enabled.
•
Minimum instruction cycle: 160 ns/12.288 MHz (externally operated at 24.576 MHz)
•
Address space : 16 Mbytes - 1Mbyte for basic memory space - 15Mbytes for
expansion memory space
•
Register file space (on-chip RAM) : 512 bytes / 16 register banks
•
I/O space : 64 Kbytes
•
Memory space under division control in variable size (6 blocks max.) Automatic wait
control.
•
I/O line (input port : 11 bits, input/output port : 42 bits).
•
DMA controller (DMAC): configuration possible with a maximum of 4 channels.
4 types of DMA transfer modes (single transfer, demand release, single step,
burst).
Intelligent DMA modes 1 and 2.
•
Serial interface : 2 channels. Either asynchronous (UART) or clocked mode (CSI) can
be selected.
•
Parallel interface : 8 bits. Centronics data input/output and general data input/output.
•
A/D converter (8 bit resolution) : 4 channel.
•
Realtime output port : 4 bits x 2 channels, or 8 bits x 1 channel.
•
PWM (Pulse Width Modulation) signal output function (8 bits).
•
Interrupt controller
Multiple interrupt service control by programmable priority (4 lev els).
3 types of interrupt response methods: vectored interrupt function, Register bank
switching function and macro service function.
•
bit timer counter : 4 channel.
•
Watch-dog timer function.
•
Software interval timer (16 bits).
•
Address block wait insert function and RAS/CAS switching timing generate function.
•
DRAM and pseudo-SRAM refresh function.
•
Stanby function (STOP mode and HALT mode).
•
Built-in clock generator.
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LA400 Multiprinter 3. 4 ER-LA400-SV
