LC72345W View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
Manufacturer
LC72345W Datasheet PDF : 13 Pages
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Pin Functions
Pin No.
Pin
I/O
LC72344W, 72345W
Function
64
XIN
I
75 kHz crystal oscillator connections
1
XOUT
O
I/O circuit
63
TEST1
2
TEST2
6
PA0
5
PA1
4
PA2
3
PA3
I IC testing.
—
I These pins must be connected to ground.
Input with built-in
Special-purpose ports for key return signal input designed with a low threshold voltage. When pull-down resistor
a key matrix is formed in combination with port PB, simultaneous multiple key presses with
I
up to 3 keys can be detected. The pull-down resistors are set up for all four pins at the same
time with the IOS instruction (PWn = 2.b1). This setting cannot be specified for individual
pins. In backup mode, these pins go to the input disabled state, and the pull-down resistors
are disabled after a reset.
10
PB0
9
PB1
8
PB2
7
PB3
Unbalanced CMOS outputs. These outputs are switched with the IOS 0 instruction. Since
these outputs are unbalanced, no diodes are required to prevent short circuits due to
O simultaneous multiple key presses. These outputs go to the high-impedance output state in
backup mode. After a reset, they go to the high-impedance output state and remain in that
state until an output instruction (OUT, SPB, or RPB) is executed.
Unbalanced CMOS
push-pull output
14
PC0
13
PC1
CMOS push-pull output
12
PC2
General-purpose I/O ports.
11
PC3
PD0 can be used as an external interrupt port. The IOS instruction (Pwn = 4, 5) is used for
switching the general-purpose I/O port function, and these ports can be set to input or output
18
INT/PD0
I/O in 1-bit units. (0: input, 1: output)
17
PD1
In backup mode they go to the input disabled high-impedance state.
16
PD2
After a reset, they switch to the general-purpose input port function.
15
PD3
(*)
20 BEEP/PE0
19
PE1
General-purpose output and beep tone output shared function ports (PE0 only). The BEEP
instruction is used to switch PE0 between the general-purpose output port and beep tone
output functions. To use PE0 as a general-purpose output port, execute a BEEP instruction N-channel open-drain output
with b2 set to 0. Set b2 to 1 to use PE0 as the beep tone output port. The b0 and b1 bits are
used to select the beep tone frequency. There are two beep tone frequencies supported.
*: When PE0 is set up as the beep tone output, executing an output instruction to PN0 only
changes the state of the internal output latch, it does not affect the beep tone output in any
way. Only the PE0 pin can be switched between the general-purpose output function and the
beep tone output function; the PE1 pin only functions as a general-purpose output. These
pins go to the high-impedance state in backup mode and remain in that state until an output
instruction or a BEEP instruction is executed. Since these ports are open-drain ports,
resistors must be inserted between these pins and VDD. These ports are set to their general-
purpose output port function after a reset.
Continued on next page.
No. 6171-7/13
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