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5.2.2 Setting of the LPT Interface
LPT communication uses a parallel interface (printer interface) of the personal computer.
LPT communication can only be used on the PC4701U/M emulator.
To set the LPT communication, click the "LPT" radio button of the MCU tab in the Init dialog. The
setting looks like the figure below.
Specify the mode for data transfers in the Type field.
• The LPT interface has four modes for data transfers, Nibble, Byte, ECP, and EPP. Their modes
are documented in the IEEE-1284 standard. The mode possible to use depends on the PC with
the debugger.
• When selecting AUTO, the debugger detect the LPT interface at the start and select a mode
possible to use which give better performance automatically. In some PC, the debugger cannot
detect the most suitable mode. Check the mode which the LPT interface in the PC have and
select it from Nibble, Byte, ECP or EPP, if cannot.
• Start the BIOS setup program of the PC for checking the mode possible to use. How to start and
use the BIOS setup program depends on each PC, so refer the manuals of the PC.
Display of BIOS Setup
Comm nication Mode u
SPP, Standard Parallel Port, Output Only Nibb le
Bidirectional, Bi-directional Byte
ECP, Extended Capabilities P rt o ECP
EPP, Enhanced Parallel Port EPP
The address displayed in the parallel port base address field is the I/O address.
Specify the I/O address set in the BIOS setup program, in the I/O Address field. (The following
addresses are possible to be specified)
• 378h
• 278h
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