as2591 austriamicrosystems, as2591 Datasheet - Page 6

• Manufacturer Part Number: as2591
• Description: 16-digit Lcd Driver Cmos Integrated Circuit
• Manufacturer: austriamicrosystems

Preliminary
LCD Symbols
Each symbol is associated with a fixed digit address. The circuit has 12 symbols implemented associated with the
lower 12 addresses.
Table 1: Symbol Overview
Symbol data are not effected by a BLINKING or by a WRITE&SHIFT command. Symbols will be displayed
independently from selecting the upper bank of the 32 digit buffer to be displayed.
The symbol displayed depends on the layout of the LCD display. If the layout of the 12/16 digit LCD displays can
be done similar, the symbol mapping does not need to be stored in the EEPROM.
Serial Interface
The serial interface uses the pins CS (chip select), SCLK (serial clock line), and DI (data input). A frame consists of
a 3-bit command and 5-bit data (see Figure 5: Frame of serial interface). Commands are executed self-timed by
the internal clock and commence at the falling edge of the CS signal.
Rev. 1.0
Optional
Optional
Optional
Optional
Optional
Optional
Enabled
Always
Always
Always
Always
Always
Always
SCLK
CS
DI
Address
y10
y11
y0
y1
y2
y3
y4
y5
y6
y7
y8
y9
MSB
C3
C2
Name
MT
MF
Vol
MR
BO
RD
PG
KL
SP
SH
LD
-
C1
D4
Description
Key lock activated
Loudspeaker on
Mute activated
DTMF dialling mode selected
Loop disconnect (pulse) dialling mode selected
Volume control keys activated. Remains on 2 seconds after last volume
key pressure
Memory redial key has been pressed. Remains on until next key pressure
Bell off. Indicates that ringer has been turn off.
Shift; indicates that shift key has been pressed. Remains on untill next key
pressure
Not used
Indicates that last number redial has been activated
Indicates program mode
Figure 5: Frame of serial interface
D3
D2
Page 6
D1
LSB
D0
AS2591
May 1999