GLK12232-25-WBL-E Matrix Orbital, GLK12232-25-WBL-E Datasheet - Page 20

• Manufacturer Part Number: GLK12232-25-WBL-E
• Description: LCD GRAPHIC DISPL 122X32 WHT BLU
• Manufacturer: Matrix Orbital

Specifications of GLK12232-25-WBL-E

• Display Type: LCD - Color
• Display Mode: Transmissive
• Viewing Area: 76.00mm L x 25.20mm W
• Backlight: LED - White
• Dot Size: 0.52mm W x 0.62mm H
• Dot Pitch: 0.53mm x 0.53mm
• Dot Pixels: 122 x 32
• Interface: I²C, RS232, TTL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.3 I
the first unread key press. A read is initiated by writing to the module with its base address plus 1, then
clocking the module’s return byte after the module releases the SDA line. Much more detail on this basic
I
(every 500 to 1000 mS is typical). All returned key presses indicate the presence or absence of additional
logged key presses by the most significant bit (MSB - bit 7). If the user has pressed two keys since the last
poll of the keypad interface, the first read will return the key code with bit 7 set and the second read will
return the key code with bit 7 clear. The application must take into account this bit to keep up with user key
presses. If there are no keypresses detected, the module will return zero (0x00).
5.4 RS-232 Interface
rate. This behavior can be modified using commands found in the next section.
5.5 Commands
5.5.1 Auto repeat mode on (254 126 [mode])
In this mode, when a key is held down, the key code is transmitted immediately and no other codes will be
sent until the key is released. On the release of the key, the key release code transmitted will be a value equal
to the key down code plus 20 hex. For example, the key code associated with key ’P’ (0x50) is pressed, the
release code is ’p’ (0x70).
should be careful of timing details. If the poll rate is slower than the simulated auto-repeat it is possible that
polling for a key up code will be delayed long enough for an unwanted key repeat to be generated.
Matrix Orbital
2
C function can be found in the I
1. Resend Key Code: This mode is similar to the action of a keyboard on a PC. In this mode, when a
2. Key down / Key up codes: This mode may be used when the typematic parameters of the Resend Key
The keypad is read by I
The module contains a ten key press buffer so that it can be polled for key presses at an infrequent rate
By default on any press of a key, the module will immediately send out the key code at the selected baud
[mode] = 0 gives Resend Key Code mode
[mode] = 1 gives Key down / Key up code mode
Two Modes of auto repeat are available and are set via the same command.
In RS-232 polled mode or via the I
key is held down, the key code is transmitted immediately followed by a 1/2 second delay. After this
delay, key codes will be sent via the RS-232 interface at a rate of about 5 codes per second. This mode
has no effect if polling or if using the I
code mode are unacceptable or if the unit is being operated in polled mode. The host system detects
the press of a key and simulates an auto repeat inside the host system until the key release is detected.
2
C Interface
2
C master read. In short, this means that a read of the module will always return
2
C specification by Phillips. A good reference is also available at;
2
C interface, the key down / key up codes are used. However, the user
GLK12232-25-WBL
2
C interface.
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