HD66740 Datasheet, PDF (10/95 Pages) Hitachi Semiconductor – 112 x 80-dot Graphics LCD Controller/Driver

HD66740
Table 2
Signals
Pin Functional Description (cont)
Number of
Pins
I/O
Connected to Functions
DB0–DB7 8
I/O or MPU
I
Serves as a bidirectional data bus for a parallel bus
interface.
For a 4-bit bus, data transfer uses DB7-DB4
Must be fixed at GND level when serial interface mode
is used.
COM1/80– 80
COM80/1
O
LCD
Common output signals for graphics display: COM1 to
COM8 for the first line, COM9 to COM16 for the
second line, COM17 to COM24 for the third line,
COM25 to COM32 for the fourth line, and COM73 to
COM80 for the 10th line. All the unused pins output
unselected waveforms. In the sleep mode (SLP = 1) or
standby mode (STB = 1), all pins output GND level.
The CMS bit can change the shift direction of the
common signal. For example, if CMS = 0, COM1/80 is
COM1. If CMS = 1, COM1/80 is COM80.
Note that the start position of the common output (the
first line) is shifted by CN1–CN0 bits.
SEG1/112– 112
SEG112/1
O
LCD
Segment output signals for graphics display. In the
sleep mode (SLP = 1) or standby mode (STB = 1), all
pins output GND level.
The SGS bit can change the shift direction of the
segment signal. For example, if SGS = 0, SEG1/112 is
SEG1. If SGS = 1, SEG1/112 is SEG112.
V1OUT–V5 5
OUT
I or O
Open or
external
bleeder-resistor
Used for output from the internal operational amplifiers
when they are used (OPOFF = GND); attach a
capacitor to stabilize the output. When the amplifiers
are not used (OPOFF = V_CC), V1 to V5 voltages can be
supplied to these pins externally.
V_LCD
3
V_CC, GND 12
OSC1,
2
OSC2
—
—
I or O
Power supply
Power supply
Oscillation-
resistor or clock
Power supply for LCD drive. V_LCD – GND = 15 V max.
V_CC: +1.8 V to +3.6 V; GND (logic): 0 V
For R-C oscillation using an external resistor, connect
an external resistor. For external clock supply, input
clock pulses to OSC1.
Vci
5
I
Power supply Inputs a reference voltage and supplies power to the
booster; generates the liquid crystal display drive
voltage from the operating voltage. The boosting
output voltage must not be larger than the absolute
maximum ratings.
Must be left disconnected when the booster is not
used.
VLOUT 3
O
V_LCD pin/booster Potential difference between Vci and GND is triple- to
capacitance five-times-boosted and then output. Magnitude of
boost is selected by instruction.
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