DISPLAY PORT SECTION 8
Page 8-2 RPC-320
DISPLAY TYPES
RPBASIC-52' s software driver is based upon the
characteristics of the display family. Compatible VF and
LCD displays are shown below:
Manufact. Model Type
Optrex DMC 40457 LCD 4 x 40
Optrex DMC 40202 LCD 2 x 40
IEEE 3601-90-080 VF 4 x 20
Optrex DMF 682N LCD 160W x 128D
DISPLAY CONNECTOR PIN OUT
The display port uses an 82C55 for data and control.
The table below lists a pin number and its intended
function. A display may not use all lines even though
they are available.
J4 8255 Function
Pin Port/line
1 Logic + 5V
2 Digital ground
3 A/4 D4
4 Contrast voltage
5 A/6 D6
6 A/5 D5
7 B/4 Reset (from invertor)
8 B/3 Write
9 B/2 Read
10 A/7 D7
11 A/1 D1
12 A/0 D0
13 A/3 D3
14 A/2 D2
15 B/7 CS (from invertor)
16 B/6 Command/data
17 B/5 Halt
18 Contrast adjust
19 Alternate power
20 Power ground
J4 is available for additional I/O if a display is not used.
Port A is configured as an input or output. Port B must
be configured as an output if a 17 key or larger keypad is
used. Use the L INE B command to access this part.
I/O bank is 4.
Pins 18, 19, and 20 are for the LCD-5003 and other
graphic displays.
COMMANDS
The following RPBASIC-52 commands are used for the
display.
Command Function
CLEAR DISPLAY Clears entire display
CLEAR DISPLAY LINE Clears current line
CONFIG DISPLAY Specifies display type to
use
DISPLAY Prints the string at the
row and collum specified
