pcf2119x-2 NXP Semiconductors, pcf2119x-2 Datasheet - Page 25

• Manufacturer Part Number: pcf2119x-2
• Description: Controllers/drivers
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8.4
8.4.1
The display is on when D = 1 and off when D = 0. Display
data in the DDRAM is not affected and can be displayed
immediately by setting D to a logic 1.
When the display is off (D = 0) the chip is in partial
power-down mode:
Three oscillator cycles are required after sending the
‘display off’ instruction to ensure all outputs are at V
afterwards OSC can be stopped. If the oscillator is running
during partial power-down mode (‘display off’) the chip can
still execute instructions. Even lower current consumption
is obtained by inhibiting the oscillator (OSC = V
To ensure I
should be connected to V
open-circuit and PD to V
mode: PD back to logic 0, if necessary OSC back to V
and send a ‘display control’ instruction with D = 1.
8.4.2
The cursor is displayed when C = 1 and inhibited when
C = 0. Even if the cursor disappears, the display functions
I/D, etc. remain in operation during display data write.
The cursor is displayed using 5 dots in the 8th line
(see Fig.5).
8.4.3
The character indicated by the cursor blinks when B = 1.
The cursor character blink is displayed by switching
between display characters and all dots on with a period of
approximately 1 second, with
The cursor underline and the cursor character blink can be
set to display simultaneously.
28. August 2000
The LCD outputs are connected to V
The LCD generator and bias generator are turned off.
LCD controllers/drivers
Display control (and partial power-down mode)
D
C
B
DD
<1 A, the parallel bus pads DB7 to DB0
DD
DD
. Recovery from power-down
; RS and R/W to V
f
blink
=
---------------- -
52 224
SS
f
OSC
DD
SS
).
or left
SS
,
DD
25
8.5
‘Cursor/display shift’ moves the cursor position or the
display to the right or left without writing or reading display
data. This function is used to correct a character or move
the cursor through the display. In 2-line displays, the
cursor moves to the next line when it passes the last
position (40) of the line. When the displayed data is shifted
repeatedly all lines shift at the same time; displayed
characters do not shift into the next line.
The Address Counter (AC) content does not change if the
only action performed is shift display, but increments or
decrements with the ‘cursor shift’.
8.6
8.6.1
Sets interface data width. Data is sent or received in bytes
(DB7 to DB0) when DL = 1 or in two nibbles (DB7 to DB4)
when DL = 0. When 4-bit width is selected, data is
transmitted in two cycles using the parallel bus. In a 4-bit
application DB3 to DB0 should be left open-circuit (internal
pull-ups). Hence in the first ‘function set’ instruction after
power-on M, SL and H are set to logic 1. A second
‘function set’ must then be sent (2 nibbles) to set M,
SL and H to their required values.
‘Function set’ from the I
logic 1.
8.6.2
Selects either 1-line by 32 display (M = 0) or 2-line by
16 display (M = 1).
8.6.3
Selects MUX 1 : 9, 1-line by 16 display (independent of
M and L). Only rows 1 to 8 and 17 are to be used. All other
rows must be left open-circuit. The DDRAM map is the
same as in the 2-line by 16 display mode, however, the
second line is not displayable.
Cursor or display shift
Function set
DL (
M
SL
PARALLEL MODE ONLY
2
C-bus interface sets the DL bit to
)
PCF2119x-2
Product specification