HD66732
13
Table 2
Pin Functional Description (cont)
Signals
PORT0–
PORT2
Number of
Pins
3
I/O
O
Connected to
General output
Functions
General output ports. These ports cannot drive
current such as for LEDs or backlighting control.
Boost the current using an external transistor.
Common output signals for segment-icon display.
COMS1/2,
COMS2/1
COM1/52–
COM52/1
2
O
LCD
52
O
LCD
Common output signals for character/graphics
display: COM1 to COM13 for the first line, COM14 to
COM26 for the second line, COM27 to COM39 for
the third line, and COM40 to COM52 for the fourth
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, COM1/52
is COM1. If CMS = 1, COM1/52 is COM52.
Segment output signals for segment-icon display and
character/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, SEG1/120
is SEG1. If SGS = 1, SEG1/120 is SEG120.
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
), V1 to V5
voltages can be supplied to these pins externally.
Power supply for LCD drive. V
LCD
– GND = 13 V max.
V
CC
: +2.4 V to +5.5 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.
Inputs a reference voltage and supplies power to the
booster; generates the liquid crystal display drive
voltage from the operating voltage.
Must be left disconnected when the booster is not
used.
Potential difference between Vci and GND is single-
to quadruple-boosted and then output. Magnitude of
boost is selected by instruction.
External capacitance should be connected here when
using the double, triple, or quadruple booster.
External capacitance should be connected here when
using the triple or quadruple booster.
External capacitance should be connected here when
using the quadruple booster.
SEG1/120–
SEG120/1
120
O
LCD
V1OUT–
V5OUT
10
I or O
Open or
external
bleeder-resistor
V
LCD
V
CC
, GND
OSC1,
OSC2
3
7
2
—
—
I or O
Power supply
Power supply
Oscillation-
resistor or clock
Vci
3
I
Power supply
VLOUT
3
O
V
pin/booster
capacitance
C1+, C1–
8
—
Booster
capacitance
Booster
capacitance
Booster
capacitance
C2+, C2–
8
—
C3+, C3–
8
—