UPD17068 datasheet(19/341 Pages) NEC

19 / 341 page

µPD17068

Function

I/O

Output type

At reset

Also used as:

Output pin for the charge pump of the

Output

CMOS tristate

High impedance

–

PLL frequency synthesizer.

When the divided local oscillation

(VCO) frequency is higher than the

reference frequency, the output of this

pin goes to high level. When the

divided frequency is lower than the

reference frequency, the output of this

pin goes to low level. When the

frequencies are the same, this pin

enters floating status.

PSC

Output pin for pulse swallow control.

Output

CMOS push-pull

Output

–

This pin is used to output a signal to

change the frequency division ratio

to the

µPB595 dedicated prescaler.

VCO

Local oscillation input pin.

Input

–

Internally pulled-

–

The local oscillation (VCO) output from

down

the tuner is frequency-divided by the

µPB595 dedicated prescaler and input

to this pin (the

µPB595 is a two-

modulus prescaler for up to 1 GHz).

HSCNT

Input pin for horizontal synchronizing

Input

–

Input

P0B3

signal counter.

BLANK

Output pin for the blanking signal for

Output

CMOS push-pull

Low-level output

–

cutting the video signal.

The signal is high active.

RED

Output pin for the R signal for

Output

CMOS push-pull

Low-level output

–

character data received from the IDC.

The signal is high active.

GREEN

Output pin for the G signal for

Output

CMOS push-pull

Low-level output

–

character data from the IDC.

The signal is high active.

BLUE

Output pin for the B signal for

Output

CMOS push-pull

Low-level output

–

character data from the IDC.

The signal is high active.

Output pin for the I signal for character

Output

CMOS push-pull

Input

P0B2

data from the IDC.

HSYNC

Input pin for the horizontal synchro-

Input

–

Input

–

nizing signal for the IDC.

Used to input the active-low horizontal

synchronizing signal.

VSYNC

Input pin for the vertical synchronizing

Input

–

Input

–

signal for the IDC.

Used to input the active-low vertical

synchronizing signal.

OSCIN

–

OSCOUT

Pins for connecting the LC oscillation

circuit for the IDC.

Used to connect a 10 MHz LC

oscillation circuit.

UPD17068 Datasheet(PDF) 19 Page - NEC

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