UPD16680 datasheet(7/44 Pages) NEC

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Data Sheet S12694EJ2V0DS00

µµµµPD16680

3.2 Logic System Pins (1/2)

Pin Symbol

Pin Name

Pin No.

I/O

Function Description

Word length select pin

(Word Select)

This pin selects the word length.

At High level, it become an 8-bit parallel interface.

At Low level, when D7(NS) is High level, it become a serial

interface.

When the word length is 4 bits, data is transferred in the

upper-to-low sequence by mean of data busses D0 to D3.

The word length cannot be changed after power-on.

DACHA

D/A converter select pin

This pin selects whether to use the internal D/A converter for

LCD driving voltage adjustment or not.

At High level, D/A converter is used. At Low level, unused.

STB

Strobe

This pin is select signal of device, strobe signal for data

transfer. Data transfer is initialized at falling/rising edge of

STB.

Data can be input/output at Low level either in parallel

interface or serial interface mode.

When STB is High level, Enable/shift clock is bypassed.

E(SCK)

Enable(shift clock)

When using parallel interface mode, this pin becomes the

data enable input. In reading-in, data is fetched into the

interface buffer at rising edge. In reading-out, data is fetched

from interface buffer at falling edge.

When using serial interface mode, this pin becomes the data

shit clock.

In reading-in, data is fetched into the interface buffer at rising

edge.

In reading-out, data is fetched from interface buffer at falling

edge.

D0(DATA)

Data-bus(data)

I/O

When using parallel interface mode, this pin becomes the D0

bit of data-bus.

When using serial interface mode, this pin becomes the

input/output pin of the command and display data (3 states).

D1 to D3

Data-bus

85 to 87

I/O

When using parallel interface mode, these pin becomes the

D1 to D3 bits of data-bus. When using serial interface mode,

keep them H or L.

D4 to D6

Data-bus

88 to 90

I/O

When using parallel interface mode, these pin become the D4

to D6 bits of data-bus. When using serial interface mode, keep

them H or L.

D7(NS)

Data-bus(nibble select)

I/O

When word select (WS) is High level, this pin becomes the D7

bit of data-bus.

When word select (WS) is Low level, This pin becomes nibble

select pin. At High level, selected 4-bit parallel interface.

At Low level, selected serial interface.

TESTOUT

TEST signal output

When to do test, this pin is output for test signal.

When using in normal operation, this pin leave open.

/RESET

Reset

At Low level, the

µPD16680 is initialized.

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