LC72347W 查看數據表（PDF） - SANYO -> Panasonic

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LC72347W

Ultralow-Voltage ETR Controller with On-Chip LCD Driver

SANYO -> Panasonic 

Pin Functions

Pin No.

Pin

I/O

LC72346W, 72347W

Function

64

XIN

I

75 kHz 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.

Special-purpose ports for key return signal input designed with a low threshold

voltage. When a key matrix is formed in combination with port PB, simultaneous

I

multiple key presses with 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.

—

Input with built-in

pull-down resistor

Unbalanced CMOS push-pull

10

PB0

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

9

PB1

due to simultaneous multiple key presses. These outputs go to the high-impedance

8

PB2

O output state in backup mode. After a reset, they go to the high-impedance output

7

PB3

state and remain in that state until an output instruction (OUT, SPB, or RPB) is

executed.

14

PC0

13

PC1

12

PC2

General-purpose I/O ports.

11

PC3

PD0, PD1 can be used as an external interrupt port. The IOS instruction (Pwn = 4, 5)

I/O is used for switching the general-purpose I/O port function, and these ports can be set

18

INT1/PD0

to input or output in 1-bit units. (0: input, 1: output)

17

INT0/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

*2

CMOS push-pull

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 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.

O *: When PE0 is set up as the beep tone output, executing an output instruction to PE0

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 general-purpose output port

function after a reset.

N-channel open-drain

Shared function pins used as either general-purpose I/O ports or a serial I/O port.

27

PK0

When used as general-purpose I/O ports, the I/O direction can be switched in single

26

SCK1/PK1

pin units with the IOS instruction (with Pwn = C). The IOS instruction (with Pwn = 1,

I/O b2) is used to switch the function between the general-purpose I/O port and the serial

25

SO1/PK2

I/O port function. (0: general-purpose I/O port, 1: serial I/O)

24

SI1/PK3

In backup mode (low power mode) these pins go to the input disabled high-

impedance state. After a reset, the general-purpose input port function is selected.

CMOS push-pull

Continued on next page.

No. 6651-7/12

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