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PIN No.
Symbol
Pin Name
P10-0/COM1
15 ~ 18
/LCD common output
P10-3/COM4
P12-0/S1
19 ~ 22
/LCD segment output
P12-3/S4
P13-0/S6
23 ~ 26
/LCD segment output
P13-3/S8
P14-0/S9
27 ~ 30
/LCD segment output
P14-3/S12
P15-0/S13
31 ~ 32
/
/LCD segment output
P15-1/S14
P16-0/S15
/Xin2
33 ~ 36
/LCD segment output
P16-3/S18
/High speed oscillator
/Xout2
Function and Operation
22-bit CMOS I/O ports, allowing input and
output to be programmed in 1-bit units.
I/O port 10
It can be set as LCD driver output through
programming.
Through a matrix with pins COM1 to
COM4 and S1 to S18, a maximum of 72
segments can be displayed.
I/O port 12
When the LCD OFF bit is set to "0", all of 8
pins of P10-0 to P12-3 become the LCD
output of COM1 to COM4 and S1 to S4.
Other LCD driver pins (S5 to S18) can be
set to the LCD driver output for every pin.
Either of two drive systems can be
selected: 1/4 duty1/2 bias system (frame
I/O port 13
frequency: 62.5 kHz) or 1/4 duty 1/3 bias
system (frame frequency: 125 kHz).
When 1/2 bias system is set, common
output is VLCD, 1/2 VLCD and GND, and
segment output is VLCD and GND. When
1/3 bias system is set, common output and
segment output are VLCD, 1/3 VLCD, 2/3
I/O port 14
VLCD and GND.
If "1" is set to DISP OFF bit, common
output is non-selected waveform and LCD
display are all switched off.
Pins P16-2 and P16-3 can be set to the
high-speed oscillation pins Xin2 and Xout2
through programming.
I/O port 15
A 300-600 kHz ceramic or crystal oscillator
is connected to Xin2 and Xout2 pins.
This oscillation clock can be changed to
CPU operation clock for high-speed CPU
operation. During execution of the clock
stop instruction, oscillation stops.
I/O port 16
Note: When changing the CPU clock to a
high-speed oscillator clock, do so
100 ms or more after the
high-speed oscillator is enabled.
7
TC9349AFG
Remarks
LCD
potential
V
DD
V
DD
Input instruction
X
R
out2
out2
R
fXT2
V
DD
X
in2
(X
, X
)
in2
out2
2006-02-24
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